diff --git a/MatrixElement/EW/ElectroWeakReweighter.cc b/MatrixElement/EW/ElectroWeakReweighter.cc
--- a/MatrixElement/EW/ElectroWeakReweighter.cc
+++ b/MatrixElement/EW/ElectroWeakReweighter.cc
@@ -1,1938 +1,1938 @@
 // -*- C++ -*-
 //
 // This is the implementation of the non-inlined, non-templated member
 // functions of the ElectroWeakReweighter class.
 //
 
 #include "ElectroWeakReweighter.h"
 #include "ThePEG/Interface/ClassDocumentation.h"
 #include "ThePEG/Interface/Reference.h"
 #include "ThePEG/EventRecord/Particle.h"
 #include "ThePEG/Repository/UseRandom.h"
 #include "ThePEG/Repository/EventGenerator.h"
 #include "ThePEG/Utilities/DescribeClass.h"
 #include "ThePEG/Persistency/PersistentOStream.h"
 #include "ThePEG/Persistency/PersistentIStream.h"
 #include "boost/numeric/ublas/matrix.hpp"
 #include "boost/numeric/ublas/operation.hpp"
 #include "EWProcess.h"
 #include "HighEnergyMatching.h"
 #include "ElectroWeakMatching.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/SpinorBarWaveFunction.h"
 #include "ThePEG/Helicity/WaveFunction/VectorWaveFunction.h"
 #include "ThePEG/Helicity/epsilon.h"
 
 using namespace Herwig;
 
 tEWCouplingsPtr ElectroWeakReweighter::staticEWCouplings_ = tEWCouplingsPtr();
 
 
 ElectroWeakReweighter::ElectroWeakReweighter() {}
 
 ElectroWeakReweighter::~ElectroWeakReweighter() {}
 
 IBPtr ElectroWeakReweighter::clone() const {
   return new_ptr(*this);
 }
 
 IBPtr ElectroWeakReweighter::fullclone() const {
   return new_ptr(*this);
 }
 
 void ElectroWeakReweighter::persistentOutput(PersistentOStream & os) const {
   os << EWCouplings_ << collinearSudakov_ << softSudakov_;
 }
 
 void ElectroWeakReweighter::persistentInput(PersistentIStream & is, int) {
   is >> EWCouplings_ >> collinearSudakov_ >> softSudakov_;
 }
 
 
 // The following static variable is needed for the type
 // description system in ThePEG.
 DescribeClass<ElectroWeakReweighter,ReweightBase>
   describeHerwigElectroWeakReweighter("Herwig::ElectroWeakReweighter", "HwMEEW.so");
 
 void ElectroWeakReweighter::Init() {
 
   static ClassDocumentation<ElectroWeakReweighter> documentation
     ("There is no documentation for the ElectroWeakReweighter class");
 
   static Reference<ElectroWeakReweighter,EWCouplings> interfaceEWCouplings
     ("EWCouplings",
      "The object to calculate the electroweak couplings",
      &ElectroWeakReweighter::EWCouplings_, false, false, true, false, false);
 
   static Reference<ElectroWeakReweighter,CollinearSudakov> interfaceCollinearSudakov
     ("CollinearSudakov",
      "The collinear Sudakov",
      &ElectroWeakReweighter::collinearSudakov_, false, false, true, false, false);
 
   static Reference<ElectroWeakReweighter,SoftSudakov> interfaceSoftSudakov
     ("SoftSudakov",
      "The soft Sudakov",
      &ElectroWeakReweighter::softSudakov_, false, false, true, false, false);
 
 }
 
 namespace {
 #ifdef ThePEG_HAS_UNITS_CHECKING
 void axpy_prod_local(const boost::numeric::ublas::matrix<Complex>  & A,
 		     const boost::numeric::ublas::matrix<complex<InvEnergy2> > & B,
 		     boost::numeric::ublas::matrix<complex<InvEnergy2> > & C) {
   assert(A.size2()==B.size1());
   C.resize(A.size1(),B.size2());
   for(unsigned int ix=0;ix<A.size1();++ix) {
     for(unsigned int iy=0;iy<B.size2();++iy) {
       C(ix,iy) = ZERO;
       for(unsigned int iz=0;iz<A.size2();++iz) {
 	C(ix,iy) += A(ix,iz)*B(iz,iy);
       }
     }
   }
 }
 
 void axpy_prod_local(const boost::numeric::ublas::matrix<complex<InvEnergy2> >  & A,
 		     const boost::numeric::ublas::vector<complex<Energy2> >      & B,
 		     boost::numeric::ublas::vector<Complex > & C) {
   assert(A.size2()==B.size());
   C.resize(A.size1());
   for(unsigned int ix=0;ix<A.size1();++ix) {
     C(ix) = ZERO;
       for(unsigned int iz=0;iz<A.size2();++iz) {
 	C(ix) += A(ix,iz)*B(iz);
       }
   }
 }
 
 void axpy_prod_local(const boost::numeric::ublas::matrix<complex<InvEnergy2> > & A,
 		     const boost::numeric::ublas::matrix<Complex> & B,
 		     boost::numeric::ublas::matrix<complex<InvEnergy2> > & C) {
   assert(A.size2()==B.size1());
   C.resize(A.size1(),B.size2());
   for(unsigned int ix=0;ix<A.size1();++ix) {
     for(unsigned int iy=0;iy<B.size2();++iy) {
       C(ix,iy) = ZERO;
       for(unsigned int iz=0;iz<A.size2();++iz) {
 	C(ix,iy) += A(ix,iz)*B(iz,iy);
       }
     }
   }
 }
 
 #else
 void axpy_prod_local(const boost::numeric::ublas::matrix<Complex> & A,
 		     const boost::numeric::ublas::matrix<Complex> & B,
 		     boost::numeric::ublas::matrix<Complex> & C) {
   axpy_prod(A,B,C);
 }
 
 void axpy_prod_local(const boost::numeric::ublas::matrix<Complex> & A,
-		     const boost::numeric::ublas::matrix<Complex> & B,
+		     const boost::numeric::ublas::vector<Complex> & B,
 		     boost::numeric::ublas::vector<Complex> & C) {
   axpy_prod(A,B,C);
 }
 #endif
 
 }
 
 double ElectroWeakReweighter::weight() const {
   EWCouplings_->initialize();
   staticEWCouplings_ = EWCouplings_;
   // cerr << "aEM\n";
   // for(Energy scale=10.*GeV; scale<10*TeV; scale *= 1.1) {
   //   cerr << scale/GeV << " " 
   // 	 << EWCouplings_->aEM(scale) << "\n";
   // }
   // cerr << "aS\n";
   // for(Energy scale=10.*GeV; scale<10*TeV; scale *= 1.4) {
   //   cerr << scale/GeV << " " 
   // 	 << EWCouplings_->aS(scale) << "\n";
   // }
   // cerr << "y_t\n";
   // for(Energy scale=10.*GeV; scale<10*TeV; scale *= 1.4) {
   //   cerr << scale/GeV << " " 
   // 	 << EWCouplings_->y_t(scale) << "\n";
   // }
   // cerr << "lambda\n";
   // for(Energy scale=91.2*GeV; scale<10*TeV; scale *= 1.4) {
   //   cerr << scale/GeV << " " 
   // 	 << EWCouplings_->lambda(scale) << "\n";
   // }
   // cerr << "vev\n";
   // for(Energy scale=91.2*GeV; scale<10*TeV; scale *= 1.4) {
   //   cerr << scale/GeV << " " 
   // 	 << EWCouplings_->vev(scale)/GeV << "\n";
   // }
   // collinearSudakov_->makePlots();
   // Energy2 s = sqr(5000.*GeV);
   // Energy2 t = -0.25*s;
   // Energy2 u = -0.75*s;
   // testEvolution(s,t,u);
 
 
 
 
   // cerr <<  subProcess() << "\n";
   // cerr << *subProcess() << "\n";
   // cerr << subProcess()->outgoing()[0] << *subProcess()->outgoing()[0] << "\n";
   // cerr << subProcess()->outgoing()[0]->spinInfo() << "\n";
   // cerr << subProcess()->outgoing()[0]->spinInfo()->productionVertex() << "\n";
   if(subProcess()->outgoing().size()!=2)
     return 1.;
   // processes with gg initial-state
   if(subProcess()->incoming().first->id()==ParticleID::g &&
      subProcess()->incoming().second->id()==ParticleID::g) {
     if(subProcess()->outgoing()[0]->id()==ParticleID::g &&
        subProcess()->outgoing()[1]->id()==ParticleID::g)
       return 1.;
     else if(abs(subProcess()->outgoing()[0]->id())<=6 &&
 	    subProcess()->outgoing()[0]->id()==-subProcess()->outgoing()[1]->id()) {
       return reweightggqqbar();
     }
     else
       assert(false);
   }
   // processes with q qbar initial-state
   else if((subProcess()->incoming().first ->id() > 0 &&
 	   subProcess()->incoming().first ->id()<= 5 &&
 	   subProcess()->incoming().second->id() < 0 &&
 	   subProcess()->incoming().second->id()>=-5) ||
 	  (subProcess()->incoming().second->id() > 0 &&
 	   subProcess()->incoming().second->id()<= 5 &&
 	   subProcess()->incoming().first ->id() < 0 &&
 	   subProcess()->incoming().first ->id()>=-5)) {
     // identical flavour q qbar
     if(subProcess()->incoming().first ->id() == -subProcess()->incoming().second->id()) {
       // q qbar -> gg
       if(subProcess()->outgoing()[0]->id()==ParticleID::g &&
 	 subProcess()->outgoing()[1]->id()==ParticleID::g)
 	return reweightqqbargg();
       // q qbar -> q' q'bar
       else if(subProcess()->outgoing()[0]->id() == -subProcess()->outgoing()[1]->id() &&
 	      abs(subProcess()->outgoing()[0]->id())<=6)
 	return reweightqqbarqqbarS();
     }
     // different flavour q qbar
     else {
       if((subProcess()->outgoing()[0]->id() > 0 &&
 	  subProcess()->outgoing()[0]->id()<= 5 &&
 	  subProcess()->outgoing()[1]->id() < 0 &&
 	  subProcess()->outgoing()[1]->id()>=-5) ||
 	 (subProcess()->outgoing()[1]->id() > 0 &&
 	  subProcess()->outgoing()[1]->id()<= 5 &&
 	  subProcess()->outgoing()[0]->id() < 0 &&
 	  subProcess()->outgoing()[0]->id()>=-5)) {
 	return reweightqqbarqqbarT();
       }
       else
 	assert(false);
     }
   }
   // processes with q g initial-state
   else if((subProcess()->incoming().first ->id()> 0 &&
 	   subProcess()->incoming().first ->id()<=5 &&
 	   subProcess()->incoming().second->id()==ParticleID::g) ||
 	  (subProcess()->incoming().second->id()> 0 &&
 	   subProcess()->incoming().second->id()<=5 &&
 	   subProcess()->incoming().first ->id()==ParticleID::g)) {
     // qg -> qg
     if((subProcess()->outgoing()[0]->id()> 0 &&
 	subProcess()->outgoing()[0]->id()<=5 &&
 	subProcess()->outgoing()[1]->id()==ParticleID::g) ||
        (subProcess()->outgoing()[1]->id()> 0 &&
 	subProcess()->outgoing()[1]->id()<=5 &&
 	subProcess()->outgoing()[0]->id()==ParticleID::g))
       return reweightqgqg();
     // unknown
     else
       assert(false);
   }
   // processes with qbar g initial-state
   else if((subProcess()->incoming().first ->id()>=-5 &&
 	   subProcess()->incoming().first ->id()<  0 &&
 	   subProcess()->incoming().second->id()==ParticleID::g) ||
 	  (subProcess()->incoming().second->id()>=-5 &&
 	   subProcess()->incoming().second->id()<  0 &&
 	   subProcess()->incoming().first ->id()==ParticleID::g)) {
     if((subProcess()->outgoing()[0]->id()>=-5 &&
 	subProcess()->outgoing()[0]->id()<  0 &&
 	subProcess()->outgoing()[1]->id()==ParticleID::g) ||
        (subProcess()->outgoing()[1]->id()>=-5 &&
 	subProcess()->outgoing()[1]->id()<  0 &&
 	subProcess()->outgoing()[0]->id()==ParticleID::g))
       return reweightqbargqbarg();
     else
       assert(false);
   }
   // processes with q q initial-state
   else if( subProcess()->incoming().first ->id()> 0 &&
 	   subProcess()->incoming().first ->id()<=5 &&
 	   subProcess()->incoming().second->id()> 0 &&
 	   subProcess()->incoming().second->id()<=5 ) {
     if(subProcess()->outgoing()[0]->id()> 0 &&
        subProcess()->outgoing()[0]->id()<=5 &&
        subProcess()->outgoing()[1]->id()> 0 &&
        subProcess()->outgoing()[1]->id()<=5)
       return reweightqqqq();
     else
       assert(false);
   }
   // processes with qbar qbar initial-state
   else if( subProcess()->incoming().first ->id()<   0 &&
 	   subProcess()->incoming().first ->id()>= -5 &&
 	   subProcess()->incoming().second->id()<   0 &&
 	   subProcess()->incoming().second->id()>= -5 ) {
     if(subProcess()->outgoing()[0]->id()<   0 &&
        subProcess()->outgoing()[0]->id()>= -5 &&
        subProcess()->outgoing()[1]->id()<   0 &&
        subProcess()->outgoing()[1]->id()>= -5)
       return reweightqbarqbarqbarqbar();
     else
       assert(false);
   }
   // unknown initial-state
   else
     assert(false);
   assert(false);
   staticEWCouplings_ = tEWCouplingsPtr();
 }
 
 void ElectroWeakReweighter::testEvolution(Energy2 s,Energy2 t, Energy2 u) const {
   Energy highScale = sqrt(s);
   Energy ewScale = coupling()->mZ();
   Energy lowScale = 50.0*GeV;
   for (unsigned int i=0; i<45;++i) {
     EWProcess::Process process = (EWProcess::Process)i;
     cerr << "process " << process << "\n";
     // result for all EW and QCD SCET contributions:
     boost::numeric::ublas::matrix<complex<InvEnergy2> > highMatch_val 
       = HighEnergyMatching::highEnergyMatching(highScale,s,t,u,process,true,true);
     boost::numeric::ublas::matrix<Complex> highRunning_val
       = softSudakov_->highEnergyRunning(highScale,ewScale,s,t,u,process,0);
     boost::numeric::ublas::matrix<Complex> ewMatch_val = 
       ElectroWeakMatching::electroWeakMatching(ewScale,s,t,u,process,true,0);
     boost::numeric::ublas::matrix<Complex> lowRunning_val = 
       softSudakov_->lowEnergyRunning(ewScale,lowScale,s,t,u,process,0);
     boost::numeric::ublas::matrix<Complex> collinearHighRunning_val =
       collinearSudakov_->highEnergyRunning(highScale,ewScale,s,process,false);
     boost::numeric::ublas::matrix<Complex> collinearEWMatch_val =
       collinearSudakov_->electroWeakMatching(ewScale,s,process,true);
     boost::numeric::ublas::matrix<Complex> collinearLowRunning_val =
       collinearSudakov_->lowEnergyRunning(ewScale,lowScale,s,process);
     boost::numeric::ublas::matrix<Complex> lowMatchTemp_val = 
       boost::numeric::ublas::zero_matrix<Complex>(ewMatch_val.size1(),ewMatch_val.size2());
     for (unsigned int ii=0; ii<ewMatch_val.size1(); ++ii) {
       for (unsigned int jj=0; jj<ewMatch_val.size2(); ++jj) {
 	lowMatchTemp_val(ii,jj) = collinearEWMatch_val(ii,jj)*ewMatch_val(ii,jj);
       }
     }
     boost::numeric::ublas::matrix<Complex> temp(highRunning_val.size1(),collinearHighRunning_val.size2());
     boost::numeric::ublas::axpy_prod(highRunning_val,collinearHighRunning_val,temp);
     boost::numeric::ublas::matrix<Complex> temp2(collinearLowRunning_val.size1(),lowRunning_val.size2());
     boost::numeric::ublas::axpy_prod(collinearLowRunning_val,lowRunning_val,temp2);
     boost::numeric::ublas::matrix<Complex> temp3(temp2.size1(),lowMatchTemp_val.size2());
     boost::numeric::ublas::axpy_prod(temp2,lowMatchTemp_val,temp3);
     temp2.resize(temp3.size1(),temp.size2());
     boost::numeric::ublas::axpy_prod(temp3,temp,temp2);
     boost::numeric::ublas::matrix<complex<InvEnergy2> >  result(temp2.size1(),highMatch_val.size2());
     axpy_prod_local(temp2,highMatch_val,result);
     for(unsigned int ix=0;ix<result.size1();++ix) {
       for(unsigned int iy=0;iy<result.size2();++iy) {
 	cerr << s*result(ix,iy) << " ";
       }
       cerr << "\n";
     }
   }
 }
 
 namespace {
 
 void SackGluonPolarizations(Lorentz5Momentum &p1,
 			    Lorentz5Momentum &p2,
 			    Lorentz5Momentum &p3,
 			    Lorentz5Momentum &p4,
 			    Energy2 s, Energy2 t, Energy2 u, Energy2 m2,
 			    vector<LorentzVector<Complex> > & eps3,
 			    vector<LorentzVector<Complex> > & eps4,
 			    unsigned int iopt) {
   static const Complex I(0.,1.);
   // p1 is p-, p2 is p+
   // p3 is k-, p4 is k+
   // both final-state
   if(iopt==0) {
     // swap t and u due Aneesh's defn
     Energy3 den1 = sqrt((u*t-sqr(m2))*(s-4.*m2));
     Energy3 den2 = sqrt(s*(u*t-sqr(m2)));
     LorentzVector<Complex> eps3Para = (m2+t)/den1*p1 -(m2+u)/den1*p2 +(u-t)/den1*p3;
     LorentzVector<Complex> eps3Perp = 2./den2*epsilon(p1,p2,p3);
     LorentzVector<Complex> eps4Para = (m2+t)/den1*p2 -(m2+u)/den1*p1 +(u-t)/den1*p4;
     LorentzVector<Complex> eps4Perp = 2./den2*epsilon(p1,p2,p4);
     eps3.push_back(sqrt(0.5)*(eps3Para+I*eps3Perp));
     eps3.push_back(sqrt(0.5)*(eps3Para-I*eps3Perp));
     eps4.push_back(sqrt(0.5)*(eps4Para+I*eps4Perp));
     eps4.push_back(sqrt(0.5)*(eps4Para-I*eps4Perp));
     if(m2!=ZERO) assert(false);
   }
   // both initial-state
   else if(iopt==1) {
     if(m2!=ZERO) assert(false);
     LorentzVector<Complex> eps3Para( 1., 0.,0.,0.);
     LorentzVector<Complex> eps3Perp( 0.,-1.,0.,0.);
     LorentzVector<Complex> eps4Para(-1.,0.,0., 0.);
     LorentzVector<Complex> eps4Perp( 0., 1.,0.,0.);
     eps3.push_back(sqrt(0.5)*(eps3Para+I*eps3Perp));
     eps3.push_back(sqrt(0.5)*(eps3Para-I*eps3Perp));
     eps4.push_back(sqrt(0.5)*(eps4Para+I*eps4Perp));
     eps4.push_back(sqrt(0.5)*(eps4Para-I*eps4Perp));
   }
   else if(iopt==2) {
     // rotation into the 2,3 Breit frame
     Lorentz5Momentum pa = p3-p2;
     Axis axis(pa.vect().unit());
     LorentzRotation rot;
     double sinth(sqrt(sqr(axis.x())+sqr(axis.y())));
     if ( sinth > 1.e-9 )
       rot.setRotate(-acos(axis.z()),Axis(-axis.y()/sinth,axis.x()/sinth,0.));
     rot.rotateX(Constants::pi);
     rot.boostZ( pa.e()/pa.vect().mag());
     Lorentz5Momentum ptemp=rot*p2;
     Boost trans = -1./ptemp.e()*ptemp.vect();
     trans.setZ(0.);
     rot.boost(trans);
     LorentzVector<Complex> eps3Para( 1., 0.,0.,0.);
     LorentzVector<Complex> eps3Perp( 0.,-1.,0.,0.);
     LorentzVector<Complex> eps4Para(-1.,0.,0., 0.);
     LorentzVector<Complex> eps4Perp( 0., 1.,0.,0.);
     eps3.push_back(sqrt(0.5)*(eps3Para+I*eps3Perp));
     eps3.push_back(sqrt(0.5)*(eps3Para-I*eps3Perp));
     eps4.push_back(sqrt(0.5)*(eps4Para+I*eps4Perp));
     eps4.push_back(sqrt(0.5)*(eps4Para-I*eps4Perp));
     rot = rot.invert();
     for(unsigned int ix=0;ix<2;++ix) {
       eps3[ix] *=rot;
       eps4[ix] *=rot;
     }
   }
   else if(iopt==3) {
     // rotation into the 1,4 Breit frame
     Lorentz5Momentum pa = p4-p1;
     Axis axis(pa.vect().unit());
     LorentzRotation rot;
     double sinth(sqrt(sqr(axis.x())+sqr(axis.y())));
     if ( sinth > 1.e-9 )
       rot.setRotate(-acos(axis.z()),Axis(-axis.y()/sinth,axis.x()/sinth,0.));
     rot.rotateX(Constants::pi);
     rot.boostZ( pa.e()/pa.vect().mag());
     Lorentz5Momentum ptemp=rot*p1;
     Boost trans = -1./ptemp.e()*ptemp.vect();
     trans.setZ(0.);
     rot.boost(trans);
     LorentzVector<Complex> eps3Para( 1., 0.,0.,0.);
     LorentzVector<Complex> eps3Perp( 0.,-1.,0.,0.);
     LorentzVector<Complex> eps4Para(-1.,0.,0., 0.);
     LorentzVector<Complex> eps4Perp( 0., 1.,0.,0.);
     eps3.push_back(sqrt(0.5)*(eps3Para+I*eps3Perp));
     eps3.push_back(sqrt(0.5)*(eps3Para-I*eps3Perp));
     eps4.push_back(sqrt(0.5)*(eps4Para+I*eps4Perp));
     eps4.push_back(sqrt(0.5)*(eps4Para-I*eps4Perp));
     rot = rot.invert();
     for(unsigned int ix=0;ix<2;++ix) {
       eps3[ix] *=rot;
       eps4[ix] *=rot;
     }
   }
   else
     assert(false);
 }
 
 }
 
 double ElectroWeakReweighter::reweightqqbargg() const {
   // momenta and invariants
   Lorentz5Momentum p1   = subProcess()->incoming().first ->momentum();
   tcPDPtr          q    = subProcess()->incoming().first ->dataPtr();
   Lorentz5Momentum p2   = subProcess()->incoming().second->momentum();
   tcPDPtr          qbar = subProcess()->incoming().second->dataPtr();
   if(subProcess()->incoming().first->id()<0) {
     swap(p1,p2  );
     swap(q ,qbar);
   }
   Lorentz5Momentum p3 = subProcess()->outgoing()[0]->momentum();
   Lorentz5Momentum p4 = subProcess()->outgoing()[1]->momentum();
   tcPDPtr           g = subProcess()->outgoing()[1]->dataPtr();
   Energy2 s = (p1+p2).m2();
   Energy2 t = (p1-p4).m2();
   Energy2 u = (p1-p3).m2();
   // boost to partonci rest frame
   Lorentz5Momentum psum=p1+p2;
   LorentzRotation boost(-psum.boostVector());
   p1 *= boost;
   p2 *= boost;
   p3 *= boost;
   p4 *= boost;
   // LO and EW corrected matrix element coefficients
   boost::numeric::ublas::matrix<complex<InvEnergy2> >
     bornQQGGweights,bornRRGGweights,EWQQGGweights,EWRRGGweights;
   // quark left doublet
   if(q->id()!=5) {
     bornQQGGweights = evaluateRunning(EWProcess::QQGG,s,t,u,true ,0);
     EWQQGGweights   = evaluateRunning(EWProcess::QQGG,s,t,u,false,0);
   }
   else {
     bornQQGGweights = evaluateRunning(EWProcess::QtQtGG,s,t,u,true ,0);
     EWQQGGweights   = evaluateRunning(EWProcess::QtQtGG,s,t,u,false,0);
   }
   // quark right singlet
   if(abs(subProcess()->incoming().first->id())%2==0) {
     bornRRGGweights = evaluateRunning(EWProcess::UUGG,s,t,u,true ,0);
     EWRRGGweights   = evaluateRunning(EWProcess::UUGG,s,t,u,false,0);
   }
   else {
     bornRRGGweights = evaluateRunning(EWProcess::DDGG,s,t,u,true ,0);
     EWRRGGweights   = evaluateRunning(EWProcess::DDGG,s,t,u,false,0);
   }
   SpinorWaveFunction       qw(p1,q   ,incoming);
   SpinorBarWaveFunction qbarw(p2,qbar,incoming);
   vector<LorentzVector<Complex> > eps3,eps4;
   SackGluonPolarizations(p1,p2,p3,p4,s,t,u,ZERO,eps3,eps4,0);
   boost::numeric::ublas::matrix<Complex>
     bornME = boost::numeric::ublas::zero_matrix<Complex>(3,3),
     EWME   = boost::numeric::ublas::zero_matrix<Complex>(3,3);
   for(unsigned int iq=0;iq<2;++iq) {
     if(iq==0) {
       qw.reset   (0);
       qbarw.reset(1);
     }
     else {
       qw.reset   (1);
       qbarw.reset(0);
     }
     LorentzVector<complex<Energy> > current  = iq==0 ?
       qw.dimensionedWave(). leftCurrent(qbarw.dimensionedWave()) :
       qw.dimensionedWave().rightCurrent(qbarw.dimensionedWave());
     for(unsigned int i1=0;i1<2;++i1) {
       complex<Energy> d31 = eps3[i1].dot(p1);
       for(unsigned int i2=0;i2<2;++i2) {
 	// g1w.reset(2*i1);
 	// g2w.reset(2*i2);
 	boost::numeric::ublas::vector<complex<Energy2> > M(5);
 	Complex         d34 = eps3[i1].dot(eps4[i2]);
 	complex<Energy> d42 = eps4[i2].dot(p2);
 	// M0 in paper
 	M(0) = qw.dimensionedWave().slash(eps3[i1])
 	  .slash(p4-p2).vectorCurrent(qbarw.dimensionedWave()).dot(eps4[i2]);
 	// M4 in paper
 	M(2) =  current.dot(eps4[i2])*d31;
 	// M5 in paper
 	M(3) = -current.dot(eps3[i1])*d42;
 	// M1 in paper (missing factor)
 	M(1) =  current.dot(p4);
 	// M6 in paper
 	M(4) = M(1)*d31*d42/GeV2;
 	// M1 final factor
 	M(1) *= d34;
 	// coefficient of different contributions
 	boost::numeric::ublas::vector<Complex> Cborn(3),CEW(3),Ctest(3);
 
 
 	// Ctest(0) = 1./6.*( MEU+MET);
 	// Ctest(1) = 0.5*( MEU+MET);
 	// Ctest(2) = 0.5*(MEU+MES-MET+MES);
 	if(iq==0) {
 	  axpy_prod_local(bornQQGGweights,M,Cborn);
 	  axpy_prod_local(EWQQGGweights  ,M,CEW  );
 	}
 	else {
 	  axpy_prod_local(bornRRGGweights,M,Cborn);
 	  axpy_prod_local(EWRRGGweights  ,M,CEW  );
 	}
 	unsigned int ioff = (Cborn.size()==6 && q->id()%2!=0) ? 3 : 0;
 	for(unsigned int ix=0;ix<3;++ix) {
 	  for(unsigned int iy=0;iy<3;++iy) {
 	    bornME(ix,iy) += Cborn(ix+ioff)*conj(Cborn(iy+ioff));
 	    EWME  (ix,iy) += CEW  (ix+ioff)*conj(CEW  (iy+ioff));
 	  }
 	}
       }
     }
   }
   double born = 24.*real(bornME(0,0))+20./3.*real(bornME(1,1))+12.*real(bornME(2,2));
   double EW   = 24.*real(EWME(0,0))+20./3.*real(EWME(1,1))+12.*real(EWME(2,2));
   return EW/born;
 }
 
 boost::numeric::ublas::matrix<complex<InvEnergy2> > 
 ElectroWeakReweighter::evaluateRunning(EWProcess::Process process, Energy2 s,
 				       Energy2 t, Energy2 u, bool born,
 				       unsigned int iswap) const {
   using namespace boost::numeric::ublas;
   bool SU3save = coupling()->SU3();
   bool EWsave  = coupling()-> EW();
   Energy highScale = sqrt(s);
   Energy   ewScale = coupling()->mZ();
   Energy  lowScale = ewScale;
   // result for all EW and QCD SCET contributions:
   // MATCHING CONTRIBUTIONS
   // high energy matching
   matrix<complex<InvEnergy2> > highMatch_val;
   if(iswap==0) 
     highMatch_val = HighEnergyMatching::highEnergyMatching(highScale,s,t,u,process,!born,false);
   else if(iswap==1)
     highMatch_val = HighEnergyMatching::highEnergyMatching(highScale,t,s,u,process,!born,false);
   else if(iswap==2)
     highMatch_val = HighEnergyMatching::highEnergyMatching(highScale,u,t,s,process,!born,false);
   else
     assert(false);
   // low energy matching
   matrix<Complex> 
     ewMatch_val = ElectroWeakMatching::electroWeakMatching(ewScale,s,t,u,process,!born,iswap);
   matrix<Complex> collinearEWMatch_val =
     collinearSudakov_->electroWeakMatching(ewScale,s,process,!born);
   // EVOLUTION
   matrix<Complex> highRunning_val,lowRunning_val,
     collinearHighRunning_val,collinearLowRunning_val;
   // born process
   if(born) {
     highRunning_val = identity_matrix<Complex>(softSudakov_->numberGauge(process));
     lowRunning_val  = identity_matrix<Complex>(softSudakov_->numberBrokenGauge(process));
     collinearHighRunning_val = identity_matrix<Complex>(softSudakov_->numberGauge(process));
     collinearLowRunning_val  = identity_matrix<Complex>(softSudakov_->numberBrokenGauge(process));
   }
   // EW corrected
   else {
     coupling()->SU3(false);
     coupling()-> EW( true);
     highRunning_val = softSudakov_->highEnergyRunning(highScale, ewScale,s,t,u,process,iswap);
     lowRunning_val  = softSudakov_->lowEnergyRunning (  ewScale,lowScale,s,t,u,process,iswap);
     collinearHighRunning_val = collinearSudakov_->highEnergyRunning(highScale,ewScale,s,process,false);
     collinearLowRunning_val = collinearSudakov_->lowEnergyRunning(ewScale,lowScale,s,process);
   };
   matrix<Complex> lowMatchTemp_val = 
     zero_matrix<Complex>(ewMatch_val.size1(),ewMatch_val.size2());
   for (unsigned int ii=0; ii<ewMatch_val.size1(); ++ii) {
     for (unsigned int jj=0; jj<ewMatch_val.size2(); ++jj) {
       lowMatchTemp_val(ii,jj) = collinearEWMatch_val(ii,jj)*ewMatch_val(ii,jj);
     }
   }
   // perform all the multiplications
   matrix<Complex> temp(highRunning_val.size1(),collinearHighRunning_val.size2());
   axpy_prod(highRunning_val,collinearHighRunning_val,temp);
   matrix<Complex> temp2(collinearLowRunning_val.size1(),lowRunning_val.size2());
   axpy_prod(collinearLowRunning_val,lowRunning_val,temp2);
   matrix<Complex> temp3(temp2.size1(),lowMatchTemp_val.size2());
   axpy_prod(temp2,lowMatchTemp_val,temp3);
   temp2.resize(temp3.size1(),temp.size2());
   axpy_prod(temp3,temp,temp2);
   matrix<complex<InvEnergy2> >  result(temp2.size1(),highMatch_val.size2());
   axpy_prod_local(temp2,highMatch_val,result);
   // reset the couplings
   coupling()->SU3(SU3save);
   coupling()-> EW( EWsave);
   // return the answer
   return result;
 }
 
 
 double ElectroWeakReweighter::reweightggqqbar() const {
   // momenta and invariants
   Lorentz5Momentum p1   = subProcess()->incoming().first ->momentum();
   Lorentz5Momentum p2   = subProcess()->incoming().second->momentum();
   Lorentz5Momentum p3   = subProcess()->outgoing()[0]->momentum();
   Lorentz5Momentum p4   = subProcess()->outgoing()[1]->momentum();
   tcPDPtr          qbar = subProcess()->outgoing()[0]->dataPtr();
   tcPDPtr          q    = subProcess()->outgoing()[1]->dataPtr();
   if(q->id()<0) {
     swap(p3,p4  );
     swap(q ,qbar);
   }
   Energy2 s = (p1+p2).m2();
   Energy2 t = (p1-p4).m2();
   Energy2 u = (p1-p3).m2();
   // boost to partonic rest frame and rescale momenta of outgoing
   // so zero mass
   Lorentz5Momentum psum=p1+p2;
   LorentzRotation boost(-psum.boostVector());
   p1 *= boost;
   p2 *= boost;
   p3 *= boost;
   p4 *= boost;
   p3.setMass(ZERO);
   p3.rescaleRho();
   p4.setMass(ZERO);
   p4.rescaleRho();
   // LO and EW matrix element coefficents
   boost::numeric::ublas::matrix<complex<InvEnergy2> >
     bornQQGGweights,bornRRGGweights,EWQQGGweights,EWRRGGweights;
   // quark left doublet
   if(q->id()<5) {
     bornQQGGweights = evaluateRunning(EWProcess::QQGG,s,t,u,true ,0);
     EWQQGGweights   = evaluateRunning(EWProcess::QQGG,s,t,u,false,0);
   }
   else {
     bornQQGGweights = evaluateRunning(EWProcess::QtQtGG,s,t,u,true ,0);
     EWQQGGweights   = evaluateRunning(EWProcess::QtQtGG,s,t,u,false,0);
   }
   // quark right singlet
   if(q->id()==0) {
     if(q->id()==6) {
       bornRRGGweights = evaluateRunning(EWProcess::tRtRGG,s,t,u,true ,0);
       EWRRGGweights   = evaluateRunning(EWProcess::tRtRGG,s,t,u,false,0);
     }
     else {
       bornRRGGweights = evaluateRunning(EWProcess::UUGG,s,t,u,true ,0);
       EWRRGGweights   = evaluateRunning(EWProcess::UUGG,s,t,u,false,0);
     }
   }
   else {
     bornRRGGweights = evaluateRunning(EWProcess::DDGG,s,t,u,true ,0);
     EWRRGGweights   = evaluateRunning(EWProcess::DDGG,s,t,u,false,0);
   }
   SpinorWaveFunction       qw(p4,qbar,incoming);
   SpinorBarWaveFunction qbarw(p3,q   ,incoming);
   vector<LorentzVector<Complex> > eps1,eps2;
   SackGluonPolarizations(p1,p2,p3,p4,s,t,u,ZERO,eps1,eps2,1);
   boost::numeric::ublas::matrix<Complex>
     bornME = boost::numeric::ublas::zero_matrix<Complex>(3,3),
     EWME   = boost::numeric::ublas::zero_matrix<Complex>(3,3);
   // helicities of outgoing quarks
   for(unsigned int iq=0;iq<2;++iq) {
     if(iq==0) {
       qw.reset   (0);
       qbarw.reset(1);
     }
     else {
       qw.reset   (1);
       qbarw.reset(0);
     }
     LorentzVector<complex<Energy> > current  = iq==0 ?
       qw.dimensionedWave(). leftCurrent(qbarw.dimensionedWave()) :
       qw.dimensionedWave().rightCurrent(qbarw.dimensionedWave());
     for(unsigned int i1=0;i1<2;++i1) {
       complex<Energy> d31 = eps1[i1].dot(p3);
       for(unsigned int i2=0;i2<2;++i2) {
   	boost::numeric::ublas::vector<complex<Energy2> > M(5);
   	Complex         d34 = eps1[i1].dot(eps2[i2]);
   	complex<Energy> d42 = eps2[i2].dot(p4);
   	// M0 in paper
   	M(0) = qw.dimensionedWave().slash(eps1[i1])
   	  .slash(p2-p4).vectorCurrent(qbarw.dimensionedWave()).dot(eps2[i2]);
   	// M4 in paper
   	M(2) =  current.dot(eps2[i2])*d31;
   	// M5 in paper
   	M(3) = -current.dot(eps1[i1])*d42;
   	// M1 in paper (missing factor)
   	M(1) =  current.dot(p2);
   	// M6 in paper
   	M(4) = M(1)*d31*d42/GeV2;
   	// M1 final factor
   	M(1) *= d34;
   	// coefficient of different contributions
  	boost::numeric::ublas::vector<Complex> Cborn(3),CEW(3);
   	if(iq==0) {
   	  axpy_prod_local(bornQQGGweights,M,Cborn);
   	  axpy_prod_local(EWQQGGweights  ,M,CEW  );
   	}
   	else {
   	  axpy_prod_local(bornRRGGweights,M,Cborn);
   	  axpy_prod_local(EWRRGGweights  ,M,CEW  );
   	}
 	unsigned int ioff = (Cborn.size()==6 && q->id()%2!=0) ? 3 : 0;
   	for(unsigned int ix=0;ix<3;++ix) {
   	  for(unsigned int iy=0;iy<3;++iy) {
   	    bornME(ix,iy) += Cborn(ix+ioff)*conj(Cborn(iy+ioff));
   	    EWME  (ix,iy) += CEW  (ix+ioff)*conj(CEW  (iy+ioff));
   	  }
   	}
       }
     }
   }
   double born = 24.*real(bornME(0,0))+20./3.*real(bornME(1,1))+12.*real(bornME(2,2));
   double EW   = 24.*real(EWME(0,0))+20./3.*real(EWME(1,1))+12.*real(EWME(2,2));
   return EW/born;
 }
 
 double ElectroWeakReweighter::reweightqgqg() const {
   // momenta and invariants
   Lorentz5Momentum p1   = subProcess()->incoming().first ->momentum();
   Lorentz5Momentum p2   = subProcess()->incoming().second->momentum();
   tcPDPtr q;
   if(subProcess()->incoming().first->id()!=ParticleID::g) {
     q = subProcess()->incoming().first ->dataPtr();
   }
   else {
     q = subProcess()->incoming().second->dataPtr();
     swap(p1,p2);
   }
   Lorentz5Momentum p3 = subProcess()->outgoing()[0]->momentum();
   Lorentz5Momentum p4 = subProcess()->outgoing()[1]->momentum();
   if(subProcess()->outgoing()[0]->id()!=ParticleID::g)
     swap(p3,p4);
   Energy2 s = (p1+p2).m2();
   Energy2 t = (p1-p4).m2();
   Energy2 u = (p1-p3).m2();
   // boost to partonic rest frame
   Lorentz5Momentum psum=p1+p2;
   LorentzRotation boost(-psum.boostVector());
   p1 *= boost;
   p2 *= boost;
   p3 *= boost;
   p4 *= boost;
   // LO and EW corrected matrix element coefficients
   boost::numeric::ublas::matrix<complex<InvEnergy2> >
     bornQQGGweights,bornRRGGweights,EWQQGGweights,EWRRGGweights;
   // quark left doublet
   if(q->id()!=5) {
     bornQQGGweights = evaluateRunning(EWProcess::QQGG,s,t,u,true ,1);
     EWQQGGweights   = evaluateRunning(EWProcess::QQGG,s,t,u,false,1);
   }
   else {
     bornQQGGweights = evaluateRunning(EWProcess::QtQtGG,s,t,u,true ,1);
     EWQQGGweights   = evaluateRunning(EWProcess::QtQtGG,s,t,u,false,1);
   }
   // quark right singlet
   if(abs(q->id())%2==0) {
     bornRRGGweights = evaluateRunning(EWProcess::UUGG,s,t,u,true ,1);
     EWRRGGweights   = evaluateRunning(EWProcess::UUGG,s,t,u,false,1);
   }
   else {
     bornRRGGweights = evaluateRunning(EWProcess::DDGG,s,t,u,true ,1);
     EWRRGGweights   = evaluateRunning(EWProcess::DDGG,s,t,u,false,1);
   }
   SpinorWaveFunction       qw(p1,q,incoming);
   SpinorBarWaveFunction qbarw(p4,q,outgoing);
   vector<LorentzVector<Complex> > eps2,eps3;
   SackGluonPolarizations(p1,p2,p3,p4,s,t,u,ZERO,eps2,eps3,2);
   // compute the matrix elements
   boost::numeric::ublas::matrix<Complex>
     bornME = boost::numeric::ublas::zero_matrix<Complex>(3,3),
     EWME   = boost::numeric::ublas::zero_matrix<Complex>(3,3),
     testME = boost::numeric::ublas::zero_matrix<Complex>(3,3);
   for(unsigned int iq=0;iq<2;++iq) {
     if(iq==0) {
       qw.reset   (0);
       qbarw.reset(0);
     }
     else {
       qw.reset   (1);
       qbarw.reset(1);
     }
     LorentzVector<complex<Energy> > current  = iq==0 ?
       qw.dimensionedWave(). leftCurrent(qbarw.dimensionedWave()) :
       qw.dimensionedWave().rightCurrent(qbarw.dimensionedWave());
     for(unsigned int i1=0;i1<2;++i1) {
       complex<Energy> d31 = eps3[i1].dot(p1);
       for(unsigned int i2=0;i2<2;++i2) {
   	boost::numeric::ublas::vector<complex<Energy2> > M(5);
    	Complex         d34 = eps3[i1].dot(eps2[i2]);
    	complex<Energy> d42 = eps2[i2].dot(p4);
    	// M0 in paper
   	M(0) = qw.dimensionedWave().slash(eps3[i1])
    	  .slash(p2-p4).vectorCurrent(qbarw.dimensionedWave()).dot(eps2[i2]);
   	// M4 in paper
   	M(2) =  current.dot(eps2[i2])*d31;
   	// M5 in paper
   	M(3) = -current.dot(eps3[i1])*d42;
   	// M1 in paper (missing factor)
   	M(1) =  current.dot(p2);
  	// M6 in paper
  	M(4) = M(1)*d31*d42/GeV2;
  	// M1 final factor
  	M(1) *= d34;
  	// coefficient of different contributions
  	boost::numeric::ublas::vector<Complex> Cborn(3),CEW(3);
   	if(iq==0) {
   	  axpy_prod_local(bornQQGGweights,M,Cborn);
   	  axpy_prod_local(EWQQGGweights  ,M,CEW  );
   	}
   	else {
   	  axpy_prod_local(bornRRGGweights,M,Cborn);
   	  axpy_prod_local(EWRRGGweights  ,M,CEW  );
   	}
    	unsigned int ioff = (Cborn.size()==6 && q->id()%2!=0) ? 3 : 0;
   	for(unsigned int ix=0;ix<3;++ix) {
   	  for(unsigned int iy=0;iy<3;++iy) {
   	    bornME(ix,iy) += Cborn(ix+ioff)*conj(Cborn(iy+ioff));
   	    EWME  (ix,iy) += CEW  (ix+ioff)*conj(CEW  (iy+ioff));
   	  }
   	}
       }
     }
   }
   double born = 24.*real(bornME(0,0))+20./3.*real(bornME(1,1))+12.*real(bornME(2,2));
   double EW   = 24.*real(EWME(0,0))+20./3.*real(EWME(1,1))+12.*real(EWME(2,2));
   return EW/born;
 }
 
 double ElectroWeakReweighter::reweightqbargqbarg() const {
   // momenta and invariants
   Lorentz5Momentum p1   = subProcess()->incoming().first ->momentum();
   Lorentz5Momentum p2   = subProcess()->incoming().second->momentum();
   tcPDPtr          qbar;
   if(subProcess()->incoming().first->id()==ParticleID::g) {
     qbar = subProcess()->incoming().second->dataPtr();
   }
   else {
     qbar = subProcess()->incoming().first ->dataPtr();
     swap(p1,p2);
   }
   Lorentz5Momentum p3 = subProcess()->outgoing()[0]->momentum();
   Lorentz5Momentum p4 = subProcess()->outgoing()[1]->momentum();
   if(subProcess()->outgoing()[0]->id()==ParticleID::g)
     swap(p3,p4);
   Energy2 s = (p1+p2).m2();
   Energy2 t = (p1-p4).m2();
   Energy2 u = (p1-p3).m2();
   // boost to partonci rest frame
   Lorentz5Momentum psum=p1+p2;
   LorentzRotation boost(-psum.boostVector());
   p1 *= boost;
   p2 *= boost;
   p3 *= boost;
   p4 *= boost;
   // LO and EW corrected matrix element coefficients
   boost::numeric::ublas::matrix<complex<InvEnergy2> >
     bornQQGGweights,bornRRGGweights,EWQQGGweights,EWRRGGweights;
   // quark left doublet
   if(qbar->id()!=-5) {
     bornQQGGweights = evaluateRunning(EWProcess::QQGG,s,t,u,true ,1);
     EWQQGGweights   = evaluateRunning(EWProcess::QQGG,s,t,u,false,1);
   }
   else {
     bornQQGGweights = evaluateRunning(EWProcess::QtQtGG,s,t,u,true ,1);
     EWQQGGweights   = evaluateRunning(EWProcess::QtQtGG,s,t,u,false,1);
   }
   // quark right singlet
   if(abs(qbar->id())%2==0) {
     bornRRGGweights = evaluateRunning(EWProcess::UUGG,s,t,u,true ,1);
     EWRRGGweights   = evaluateRunning(EWProcess::UUGG,s,t,u,false,1);
   }
   else {
     bornRRGGweights = evaluateRunning(EWProcess::DDGG,s,t,u,true ,1);
     EWRRGGweights   = evaluateRunning(EWProcess::DDGG,s,t,u,false,1);
   }
   SpinorWaveFunction       qw(p3,qbar,outgoing);
   SpinorBarWaveFunction qbarw(p2,qbar,incoming);
   vector<LorentzVector<Complex> > eps1,eps4;
   SackGluonPolarizations(p1,p2,p3,p4,s,t,u,ZERO,eps1,eps4,3);
   boost::numeric::ublas::matrix<Complex>
     bornME = boost::numeric::ublas::zero_matrix<Complex>(3,3),
     EWME   = boost::numeric::ublas::zero_matrix<Complex>(3,3);
   for(unsigned int iq=0;iq<2;++iq) {
     if(iq==0) {
       qw.reset   (1);
       qbarw.reset(1);
     }
     else {
       qw.reset   (0);
       qbarw.reset(0);
     }
     LorentzVector<complex<Energy> > current  = iq==0 ?
       qw.dimensionedWave(). leftCurrent(qbarw.dimensionedWave()) :
       qw.dimensionedWave().rightCurrent(qbarw.dimensionedWave());
     for(unsigned int i1=0;i1<2;++i1) {
       complex<Energy> d31 = eps1[i1].dot(p3);
       for(unsigned int i2=0;i2<2;++i2) {
    	boost::numeric::ublas::vector<complex<Energy2> > M(5);
    	Complex         d34 = eps1[i1].dot(eps4[i2]);
    	complex<Energy> d42 = eps4[i2].dot(p2);
   	// M0 in paper
   	M(0) = qw.dimensionedWave().slash(eps1[i1])
   	  .slash(p4-p2).vectorCurrent(qbarw.dimensionedWave()).dot(eps4[i2]);
    	// M4 in paper
    	M(2) =  current.dot(eps4[i2])*d31;
   	// M5 in paper
   	M(3) = -current.dot(eps1[i1])*d42;
   	// M1 in paper (missing factor)
   	M(1) =  current.dot(p4);
   	// M6 in paper
   	M(4) = M(1)*d31*d42/GeV2;
   	// M1 final factor
   	M(1) *= d34;
   	// coefficient of different contributions
   	boost::numeric::ublas::vector<Complex> Cborn(3),CEW(3);
   	if(iq==0) {
   	  axpy_prod_local(bornQQGGweights,M,Cborn);
   	  axpy_prod_local(EWQQGGweights  ,M,CEW  );
   	}
   	else {
   	  axpy_prod_local(bornRRGGweights,M,Cborn);
   	  axpy_prod_local(EWRRGGweights  ,M,CEW  );
   	}
   	unsigned int ioff = (Cborn.size()==6 && abs(qbar->id())%2!=0) ? 3 : 0;
   	for(unsigned int ix=0;ix<3;++ix) {
   	  for(unsigned int iy=0;iy<3;++iy) {
   	    bornME(ix,iy) += Cborn(ix+ioff)*conj(Cborn(iy+ioff));
   	    EWME  (ix,iy) += CEW  (ix+ioff)*conj(CEW  (iy+ioff));
  	  }
  	}
       }
     }
   }
   double born = 24.*real(bornME(0,0))+20./3.*real(bornME(1,1))+12.*real(bornME(2,2));
   double EW   = 24.*real(EWME(0,0))+20./3.*real(EWME(1,1))+12.*real(EWME(2,2));
   return EW/born;
 }
 
 double ElectroWeakReweighter::reweightqqbarqqbarS() const {
   // momenta and invariants
   Lorentz5Momentum p1    = subProcess()->incoming().first ->momentum();
   tcPDPtr          q1    = subProcess()->incoming().first ->dataPtr();
   Lorentz5Momentum p2    = subProcess()->incoming().second->momentum();
   tcPDPtr          q1bar = subProcess()->incoming().second->dataPtr();
   if(q1->id()<0) {
     swap(p1,p2    );
     swap(q1 ,q1bar);
   }
   Lorentz5Momentum p3    = subProcess()->outgoing()[0]->momentum();
   tcPDPtr          q2bar = subProcess()->outgoing()[0]->dataPtr();
   Lorentz5Momentum p4    = subProcess()->outgoing()[1]->momentum();
   tcPDPtr          q2    = subProcess()->outgoing()[1]->dataPtr();
   if(q2bar->id()>0) {
     swap(p3,p4    );
     swap(q2 ,q2bar);
   }
   Energy2 s = (p1+p2).m2();
   Energy2 t = (p1-p4).m2();
   Energy2 u = (p1-p3).m2();
   // boost to partonci rest frame
   Lorentz5Momentum psum=p1+p2;
   LorentzRotation boost(-psum.boostVector());
   p1 *= boost;
   p2 *= boost;
   p3 *= boost;
   p4 *= boost;
   p3.setMass(ZERO);
   p3.rescaleRho();
   p4.setMass(ZERO);
   p4.rescaleRho();
   // LO and EW corrected matrix element coefficients
   boost::numeric::ublas::matrix<complex<InvEnergy2> >
     bornLLLLWeights,bornLLRRWeights,bornRRLLWeights,bornRRRRWeights,
     EWLLLLWeights,EWLLRRWeights,EWRRLLWeights,EWRRRRWeights;
   bool ident = q1->id()==q2->id();
   // LL -> LL
   if((q1->id()<=4&& q2->id()<=4)|| (q1->id()==5 && q2->id()==5)) {
     if(!ident) {
       bornLLLLWeights = evaluateRunning(EWProcess::QQQQ,s,t,u,true ,0);
       EWLLLLWeights   = evaluateRunning(EWProcess::QQQQ,s,t,u,false,0);
     }
     else {
       bornLLLLWeights = evaluateRunning(EWProcess::QQQQiden,s,t,u,true ,0);
       EWLLLLWeights   = evaluateRunning(EWProcess::QQQQiden,s,t,u,false,0);
     }
   }
   else if(q1->id()==5 || q2->id()>=5) {
     bornLLLLWeights = evaluateRunning(EWProcess::QtQtQQ,s,t,u,true ,0);
     EWLLLLWeights   = evaluateRunning(EWProcess::QtQtQQ,s,t,u,false,0);
   }
   else
     assert(false);
   // RR -> LL
   if(q1->id()%2==0) {
     if(q2->id()<5) {
       bornRRLLWeights = evaluateRunning(EWProcess::QQUU,s,t,u,true ,0);
       EWRRLLWeights   = evaluateRunning(EWProcess::QQUU,s,t,u,false,0);
     }
     else {
       bornRRLLWeights = evaluateRunning(EWProcess::QtQtUU,s,t,u,true ,0);
       EWRRLLWeights   = evaluateRunning(EWProcess::QtQtUU,s,t,u,false,0);
     }
   }
   else {
     if(q2->id()<5) {
       bornRRLLWeights = evaluateRunning(EWProcess::QQDD,s,t,u,true ,0);
       EWRRLLWeights   = evaluateRunning(EWProcess::QQDD,s,t,u,false,0);
     }
     else {
       bornRRLLWeights = evaluateRunning(EWProcess::QtQtDD,s,t,u,true ,0);
       EWRRLLWeights   = evaluateRunning(EWProcess::QtQtDD,s,t,u,false,0);
     }
   }
   // LL -> RR
   if(q1->id()<=4) {
     if(q2->id()%2!=0) {
       bornLLRRWeights = evaluateRunning(EWProcess::QQDD,s,t,u,true ,0);
       EWLLRRWeights   = evaluateRunning(EWProcess::QQDD,s,t,u,false,0);
     }
     else if (q2->id()==6) {
       bornLLRRWeights = evaluateRunning(EWProcess::QQtRtR,s,t,u,true ,0);
       EWLLRRWeights   = evaluateRunning(EWProcess::QQtRtR,s,t,u,false,0);
     }
     else {
       bornLLRRWeights = evaluateRunning(EWProcess::QQUU,s,t,u,true ,0);
       EWLLRRWeights   = evaluateRunning(EWProcess::QQUU,s,t,u,false,0);
     }
   }
   else {
     if(q2->id()%2!=0) {
       bornLLRRWeights = evaluateRunning(EWProcess::QtQtDD,s,t,u,true ,0);
       EWLLRRWeights   = evaluateRunning(EWProcess::QtQtDD,s,t,u,false,0);
     }
     else {
       bornLLRRWeights = evaluateRunning(EWProcess::QtQtUU,s,t,u,true ,0);
       EWLLRRWeights   = evaluateRunning(EWProcess::QtQtUU,s,t,u,false,0);
     }
   }
   // RR -> RR
   if(q1->id()%2==0) {
     if(q2->id()==6) {
       bornRRRRWeights = evaluateRunning(EWProcess::tRtRUU,s,t,u,true ,0);
       EWRRRRWeights   = evaluateRunning(EWProcess::tRtRUU,s,t,u,false,0);
     }
     else if(q2->id()%2==0) {
       if(ident) {
 	bornRRRRWeights = evaluateRunning(EWProcess::UUUUiden,s,t,u,true ,0);
 	EWRRRRWeights   = evaluateRunning(EWProcess::UUUUiden,s,t,u,false,0);
       }
       else {
 	bornRRRRWeights = evaluateRunning(EWProcess::UUUU,s,t,u,true ,0);
 	EWRRRRWeights   = evaluateRunning(EWProcess::UUUU,s,t,u,false,0);
       }
     }
     else {
       bornRRRRWeights = evaluateRunning(EWProcess::UUDD,s,t,u,true ,0);
       EWRRRRWeights   = evaluateRunning(EWProcess::UUDD,s,t,u,false,0);
     }
   }
   else {
     if(q2->id()==6) {
       bornRRRRWeights = evaluateRunning(EWProcess::tRtRDD,s,t,u,true ,0);
       EWRRRRWeights   = evaluateRunning(EWProcess::tRtRDD,s,t,u,false,0);
     }
     else if(q2->id()%2==0) {
       bornRRRRWeights = evaluateRunning(EWProcess::UUDD,s,t,u,true ,0);
       EWRRRRWeights   = evaluateRunning(EWProcess::UUDD,s,t,u,false,0);
     }
     else {
       if(ident) {
 	bornRRRRWeights = evaluateRunning(EWProcess::DDDDiden,s,t,u,true ,0);
 	EWRRRRWeights   = evaluateRunning(EWProcess::DDDDiden,s,t,u,false,0);
       }
       else {
 	bornRRRRWeights = evaluateRunning(EWProcess::DDDD,s,t,u,true ,0);
 	EWRRRRWeights   = evaluateRunning(EWProcess::DDDD,s,t,u,false,0);
       }
     }
   }
   // extra terms for identical particles
   boost::numeric::ublas::matrix<complex<InvEnergy2> >
     borntChannelWeights,EWtChannelWeights;
   if(ident) {
     if(q1->id()%2==0) {
       borntChannelWeights = evaluateRunning(EWProcess::QQUU,s,t,u,true ,1);
       EWtChannelWeights   = evaluateRunning(EWProcess::QQUU,s,t,u,false,1);
     }
     else if(q1->id()==5) {
       borntChannelWeights = evaluateRunning(EWProcess::QtQtDD,s,t,u,true ,1);
       EWtChannelWeights   = evaluateRunning(EWProcess::QtQtDD,s,t,u,false,1);
     }
     else {
       borntChannelWeights = evaluateRunning(EWProcess::QQDD,s,t,u,true ,1);
       EWtChannelWeights   = evaluateRunning(EWProcess::QQDD,s,t,u,false,1);
     }
   }
   SpinorWaveFunction       q1w(p1,q1   ,incoming);
   SpinorBarWaveFunction q1barw(p2,q1bar,incoming);
   SpinorWaveFunction    q2barw(p3,q2bar,outgoing);
   SpinorBarWaveFunction    q2w(p4,q2   ,outgoing);
   boost::numeric::ublas::matrix<Complex>
     bornME = boost::numeric::ublas::zero_matrix<Complex>(2,2),
     EWME   = boost::numeric::ublas::zero_matrix<Complex>(2,2);
   for(unsigned int iq1=0;iq1<2;++iq1) {
     if(iq1==0) {
       q1w.reset   (0);
       q1barw.reset(1);
     }
     else {
       q1w.reset   (1);
       q1barw.reset(0);
     }
     LorentzVector<complex<Energy> > current1 =
       q1w.dimensionedWave().vectorCurrent(q1barw.dimensionedWave());
     for(unsigned int iq2=0;iq2<2;++iq2) {
       if(iq2==0) {
 	q2w.reset   (0);
 	q2barw.reset(1);
       }
       else {
 	q2w.reset   (1);
 	q2barw.reset(0);
       }
       LorentzVector<complex<Energy> > current2 =
 	q2barw.dimensionedWave().vectorCurrent(q2w.dimensionedWave());
       complex<Energy2> amp = current1.dot(current2);
       vector<Complex> Cborn(2),CEW(2);
       // amplitudes
       if(iq1==0) {
 	// LL
 	if(iq2==0) {
 	  unsigned int ioff;
 	  if(q1->id()%2==0) {
 	    ioff = q2->id()%2==0 ? 0 : 2;
 	  }
 	  else {
 	    ioff = q2->id()%2==0 ? 1 : 3;
 	  }
 	  for(unsigned int ix=0;ix<2;++ix) {
 	    Cborn[ix] = amp*bornLLLLWeights(6*ix+ioff,0);
 	    CEW  [ix] = amp*  EWLLLLWeights(6*ix+ioff,0);
 	  }
 	}
 	// LR
 	else {
 	  unsigned int ioff =  q1->id()%2==0 ? 0 : 1;
 	  for(unsigned int ix=0;ix<2;++ix) {
 	    Cborn[ix] = amp*bornLLRRWeights(2*ix+ioff,0);
 	    CEW  [ix] = amp*  EWLLRRWeights(2*ix+ioff,0);
 	  }
 	}
       }
       else {
 	if(iq2==0) {
 	  unsigned int ioff=q2->id()%2==0 ? 0 : 1;
 	  for(unsigned int ix=0;ix<2;++ix) {
 	    Cborn[ix] = amp*bornRRLLWeights(2*ix+ioff,0);
 	    CEW  [ix] = amp*  EWRRLLWeights(2*ix+ioff,0);
 	  }
 	}
 	else {
 	  for(unsigned int ix=0;ix<2;++ix) {
 	    Cborn[ix] = amp*bornRRRRWeights(ix,0);
 	    CEW  [ix] = amp*  EWRRRRWeights(ix,0);
 	  }
 	}
       }
       // square
       for(unsigned int ix=0;ix<2;++ix) {
 	for(unsigned int iy=0;iy<2;++iy) {
 	  bornME(ix,iy) += Cborn[ix]*conj(Cborn[iy]);
 	  EWME  (ix,iy) += CEW  [ix]*conj(CEW  [iy]);
 	}
       }
     }
   }
   // extra t-channel pieces if identical flavours
   if(ident) {
     for(unsigned int iq1=0;iq1<2;++iq1) {
       q1w.reset(iq1);
       q2w.reset(iq1);
       LorentzVector<complex<Energy> > current1 =
 	q1w.dimensionedWave().vectorCurrent(q2w.dimensionedWave());
       q1barw.reset(iq1);
       q2barw.reset(iq1);
       LorentzVector<complex<Energy> > current2 =
 	q2barw.dimensionedWave().vectorCurrent(q1barw.dimensionedWave());
       complex<Energy2> amp = current1.dot(current2);
       vector<Complex> Cborn(2),CEW(2);
       unsigned int ioff =  q1->id()%2==0 ? 0 : 1;
       for(unsigned int ix=0;ix<2;++ix) {
 	Cborn[ix] = amp*borntChannelWeights(2*ix+ioff,0);
 	CEW  [ix] = amp*  EWtChannelWeights(2*ix+ioff,0);
       }
       // square
       for(unsigned int ix=0;ix<2;++ix) {
 	for(unsigned int iy=0;iy<2;++iy) {
 	  bornME(ix,iy) += Cborn[ix]*conj(Cborn[iy]);
 	  EWME  (ix,iy) += CEW  [ix]*conj(CEW  [iy]);
 	}
       }
     }
   }
   // colour factors
   double born = 2.*real(bornME(0,0))+9.*real(bornME(1,1));
   double EW   = 2.*real(  EWME(0,0))+9.*real(  EWME(1,1));
   return EW/born;
 }
 
 double ElectroWeakReweighter::reweightqqbarqqbarT() const {
   // momenta and invariants
   Lorentz5Momentum p1    = subProcess()->incoming().first ->momentum();
   tcPDPtr          q1    = subProcess()->incoming().first ->dataPtr();
   Lorentz5Momentum p2    = subProcess()->incoming().second->momentum();
   tcPDPtr          q1bar = subProcess()->incoming().second->dataPtr();
   if(q1->id()<0) {
     swap(p1,p2    );
     swap(q1 ,q1bar);
   }
   Lorentz5Momentum p3    = subProcess()->outgoing()[0]->momentum();
   tcPDPtr          q2bar = subProcess()->outgoing()[0]->dataPtr();
   Lorentz5Momentum p4    = subProcess()->outgoing()[1]->momentum();
   tcPDPtr          q2    = subProcess()->outgoing()[1]->dataPtr();
   if(q2bar->id()>0) {
     swap(p3,p4    );
     swap(q2 ,q2bar);
   }
   Energy2 s = (p1+p2).m2();
   Energy2 t = (p1-p4).m2();
   Energy2 u = (p1-p3).m2();
   // boost to partonci rest frame
   Lorentz5Momentum psum=p1+p2;
   LorentzRotation boost(-psum.boostVector());
   p1 *= boost;
   p2 *= boost;
   p3 *= boost;
   p4 *= boost;
   p3.setMass(ZERO);
   p3.rescaleRho();
   p4.setMass(ZERO);
   p4.rescaleRho();
   assert(q1==q2 && q1bar==q2bar);
   assert( q1->id() != -q1bar->id() && q2->id() != -q2bar->id() );
   // LO and EW corrected matrix element coefficients
   boost::numeric::ublas::matrix<complex<InvEnergy2> >
     bornLLLLWeights,bornLLRRWeights,bornRRLLWeights,bornRRRRWeights,
     EWLLLLWeights,EWLLRRWeights,EWRRLLWeights,EWRRRRWeights;
   // LL
   if( q1->id()    == ParticleID::b || 
       q1bar->id() == ParticleID::bbar ) {
     bornLLLLWeights = evaluateRunning(EWProcess::QtQtQQ,s,t,u,true ,1);
     EWLLLLWeights   = evaluateRunning(EWProcess::QtQtQQ,s,t,u,false,1);
   }
   else {
     bornLLLLWeights = evaluateRunning(EWProcess::QQQQ,s,t,u,true ,1);
     EWLLLLWeights   = evaluateRunning(EWProcess::QQQQ,s,t,u,false,1);
   }
   // RR -> LL
   if(q1->id()%2==0) {
     if(q1bar->id()==ParticleID::bbar) {
       bornRRLLWeights = evaluateRunning(EWProcess::QtQtUU,s,t,u,true ,1);
       EWRRLLWeights   = evaluateRunning(EWProcess::QtQtUU,s,t,u,false,1);
     }
     else {
       bornRRLLWeights = evaluateRunning(EWProcess::QQUU,s,t,u,true ,1);
       EWRRLLWeights   = evaluateRunning(EWProcess::QQUU,s,t,u,false,1);
     }
   }
   else {
     if(q1bar->id()==ParticleID::bbar) {
       bornRRLLWeights = evaluateRunning(EWProcess::QtQtDD,s,t,u,true ,1);
       EWRRLLWeights   = evaluateRunning(EWProcess::QtQtDD,s,t,u,false,1);
     }
     else {
       bornRRLLWeights = evaluateRunning(EWProcess::QQDD,s,t,u,true ,1);
       EWRRLLWeights   = evaluateRunning(EWProcess::QQDD,s,t,u,false,1);
     }
   }
   // LL -> RR
   if(abs(q1bar->id())%2==0) {
     if(q1->id()==ParticleID::b) {
       bornLLRRWeights = evaluateRunning(EWProcess::QtQtUU,s,t,u,true ,1);
       EWLLRRWeights   = evaluateRunning(EWProcess::QtQtUU,s,t,u,false,1);
     }
     else {
       bornLLRRWeights = evaluateRunning(EWProcess::QQUU,s,t,u,true ,1);
       EWLLRRWeights   = evaluateRunning(EWProcess::QQUU,s,t,u,false,1);
     }
   }
   else {
     if(q1->id()==ParticleID::b) {
       bornLLRRWeights = evaluateRunning(EWProcess::QtQtDD,s,t,u,true ,1);
       EWLLRRWeights   = evaluateRunning(EWProcess::QtQtDD,s,t,u,false,1);
     }
     else {
       bornLLRRWeights = evaluateRunning(EWProcess::QQDD,s,t,u,true ,1);
       EWLLRRWeights   = evaluateRunning(EWProcess::QQDD,s,t,u,false,1);
     }
   }
   // RR -> RR
   if(q1->id()%2==0) {
     if(abs(q1bar->id())%2==0) {
       bornRRRRWeights = evaluateRunning(EWProcess::UUUU,s,t,u,true ,1);
       EWRRRRWeights   = evaluateRunning(EWProcess::UUUU,s,t,u,false,1);
     }
     else {
       bornRRRRWeights = evaluateRunning(EWProcess::UUDD,s,t,u,true ,1);
       EWRRRRWeights   = evaluateRunning(EWProcess::UUDD,s,t,u,false,1);
     }
   }
   else {
     if(abs(q1bar->id())%2==0) {
       bornRRRRWeights = evaluateRunning(EWProcess::UUDD,s,t,u,true ,1);
       EWRRRRWeights   = evaluateRunning(EWProcess::UUDD,s,t,u,false,1);
     }
     else {
       bornRRRRWeights = evaluateRunning(EWProcess::DDDD,s,t,u,true ,1);
       EWRRRRWeights   = evaluateRunning(EWProcess::DDDD,s,t,u,false,1);
     }
   }
   // calculate the spinors
   SpinorWaveFunction       q1w(p1,q1   ,incoming);
   SpinorBarWaveFunction q1barw(p2,q1bar,incoming);
   SpinorWaveFunction    q2barw(p3,q2bar,outgoing);
   SpinorBarWaveFunction    q2w(p4,q2   ,outgoing);
   boost::numeric::ublas::matrix<Complex>
     bornME = boost::numeric::ublas::zero_matrix<Complex>(2,2),
     EWME   = boost::numeric::ublas::zero_matrix<Complex>(2,2);
   for(unsigned int iq1=0;iq1<2;++iq1) {
     q1w.reset(iq1);
     q2w.reset(iq1);
     LorentzVector<complex<Energy> > current1 =
       q1w.dimensionedWave().vectorCurrent(q2w.dimensionedWave());
     for(unsigned int iq2=0;iq2<2;++iq2) {
       q1barw.reset(iq2);
       q2barw.reset(iq2);
       LorentzVector<complex<Energy> > current2 =
 	q2barw.dimensionedWave().vectorCurrent(q1barw.dimensionedWave());
       // calculate the amplitude
       complex<Energy2> amp = current1.dot(current2);
       vector<Complex> Cborn(2),CEW(2);
       if(iq1==0) {
 	// LL RR
 	if(iq2==0) {
 	  unsigned int ioff =  q1->id()%2==0 ? 0 : 1;
 	  for(unsigned int ix=0;ix<2;++ix) {
 	    Cborn[ix] = amp*bornLLRRWeights(2*ix+ioff,0);
 	    CEW  [ix] = amp*  EWLLRRWeights(2*ix+ioff,0);
 	  }
 	}
 	// LL LL
 	else {
 	  unsigned int ioff;
 	  if(q1->id()%2==0) {
 	    ioff = abs(q1bar->id())%2==0 ? 0 : 2;
 	  }
 	  else {
 	    ioff = abs(q1bar->id())%2==0 ? 1 : 3;
 	  }
 	  for(unsigned int ix=0;ix<2;++ix) {
 	    Cborn[ix] = amp*bornLLLLWeights(6*ix+ioff,0);
 	    CEW  [ix] = amp*  EWLLLLWeights(6*ix+ioff,0);
  	  }
 	}
       }
       else {
 	// RR RR
 	if(iq2==0) {
 	  for(unsigned int ix=0;ix<2;++ix) {
 	    Cborn[ix] = amp*bornRRRRWeights(ix,0);
 	    CEW  [ix] = amp*  EWRRRRWeights(ix,0);
 	  }
 	}
 	// RR LL
 	else {
 	  unsigned int ioff=abs(q1bar->id())%2==0 ? 0 : 1;
 	  for(unsigned int ix=0;ix<2;++ix) {
 	    Cborn[ix] = amp*bornRRLLWeights(2*ix+ioff,0);
 	    CEW  [ix] = amp*  EWRRLLWeights(2*ix+ioff,0);
 	  }
 	}
       }
       // square
       for(unsigned int ix=0;ix<2;++ix) {
 	for(unsigned int iy=0;iy<2;++iy) {
 	  bornME(ix,iy) += Cborn[ix]*conj(Cborn[iy]);
 	  EWME  (ix,iy) += CEW  [ix]*conj(CEW  [iy]);
 	}
       }
     }
   }
   // colour factors
   double born = 2.*real(bornME(0,0))+9.*real(bornME(1,1));
   double EW   = 2.*real(  EWME(0,0))+9.*real(  EWME(1,1));
   return EW/born;
 }
 
 double ElectroWeakReweighter::reweightqqqq() const {
   // momenta and invariants
   Lorentz5Momentum p1 = subProcess()->incoming().first ->momentum();
   tcPDPtr          q1 = subProcess()->incoming().first ->dataPtr();
   Lorentz5Momentum p2 = subProcess()->incoming().second->momentum();
   tcPDPtr          q2 = subProcess()->incoming().second->dataPtr();
   Lorentz5Momentum p3 = subProcess()->outgoing()[0]    ->momentum();
   tcPDPtr          q3 = subProcess()->outgoing()[0]    ->dataPtr();
   Lorentz5Momentum p4 = subProcess()->outgoing()[1]    ->momentum();
   tcPDPtr          q4 = subProcess()->outgoing()[1]    ->dataPtr();
   if(q1->id()!=q3->id()) {
     swap(q3,q4);
     swap(p3,p4);
   }
   assert(q1->id()==q3->id());
   assert(q2->id()==q4->id());
   Energy2 s = (p1+p2).m2();
   Energy2 t = (p1-p4).m2();
   Energy2 u = (p1-p3).m2();
   // boost to partonci rest frame
   Lorentz5Momentum psum=p1+p2;
   LorentzRotation boost(-psum.boostVector());
   p1 *= boost;
   p2 *= boost;
   p3 *= boost;
   p4 *= boost;
   p3.setMass(ZERO);
   p3.rescaleRho();
   p4.setMass(ZERO);
   p4.rescaleRho();
   // LO and EW corrected matrix element coefficients
   boost::numeric::ublas::matrix<complex<InvEnergy2> >
     bornLLLLWeights,bornLLRRWeights,bornRRLLWeights,bornRRRRWeights,
     EWLLLLWeights,EWLLRRWeights,EWRRLLWeights,EWRRRRWeights;
   bool ident = q1->id()==q2->id();
   // LL -> LL
   if((q1->id()<=4&& q2->id()<=4)|| (q1->id()==5 && q2->id()==5)) {
     if(!ident) {
       bornLLLLWeights = evaluateRunning(EWProcess::QQQQ,s,t,u,true ,2);
       EWLLLLWeights   = evaluateRunning(EWProcess::QQQQ,s,t,u,false,2);
     }
     else {
       bornLLLLWeights = evaluateRunning(EWProcess::QQQQiden,s,t,u,true ,2);
       EWLLLLWeights   = evaluateRunning(EWProcess::QQQQiden,s,t,u,false,2);
     }
   }
   else if(q1->id()==5 || q2->id()==5) {
     bornLLLLWeights = evaluateRunning(EWProcess::QtQtQQ,s,t,u,true ,2);
     EWLLLLWeights   = evaluateRunning(EWProcess::QtQtQQ,s,t,u,false,2);
   }
   else
     assert(false);
   // RR -> LL
   if(q1->id()%2==0) {
     if(q2->id()<5) {
       bornRRLLWeights = evaluateRunning(EWProcess::QQUU,s,t,u,true ,2);
       EWRRLLWeights   = evaluateRunning(EWProcess::QQUU,s,t,u,false,2);
     }
     else {
       bornRRLLWeights = evaluateRunning(EWProcess::QtQtUU,s,t,u,true ,2);
       EWRRLLWeights   = evaluateRunning(EWProcess::QtQtUU,s,t,u,false,2);
     }
   }
   else {
     if(q2->id()<5) {
       bornRRLLWeights = evaluateRunning(EWProcess::QQDD,s,t,u,true ,2);
       EWRRLLWeights   = evaluateRunning(EWProcess::QQDD,s,t,u,false,2);
     }
     else {
       bornRRLLWeights = evaluateRunning(EWProcess::QtQtDD,s,t,u,true ,2);
       EWRRLLWeights   = evaluateRunning(EWProcess::QtQtDD,s,t,u,false,2);
     }
   }
   // LL -> RR
   if(q1->id()<=4) {
     if(q2->id()%2!=0) {
       bornLLRRWeights = evaluateRunning(EWProcess::QQDD,s,t,u,true ,2);
       EWLLRRWeights   = evaluateRunning(EWProcess::QQDD,s,t,u,false,2);
     }
     else {
       bornLLRRWeights = evaluateRunning(EWProcess::QQUU,s,t,u,true ,2);
       EWLLRRWeights   = evaluateRunning(EWProcess::QQUU,s,t,u,false,2);
     }
   }
   else {
     if(q2->id()%2!=0) {
       bornLLRRWeights = evaluateRunning(EWProcess::QtQtDD,s,t,u,true ,2);
       EWLLRRWeights   = evaluateRunning(EWProcess::QtQtDD,s,t,u,false,2);
     }
     else {
       bornLLRRWeights = evaluateRunning(EWProcess::QtQtUU,s,t,u,true ,2);
       EWLLRRWeights   = evaluateRunning(EWProcess::QtQtUU,s,t,u,false,2);
     }
   }
   // RR -> RR
   if(q1->id()%2==0) {
     if(q2->id()%2==0) {
       if(ident) {
   	bornRRRRWeights = evaluateRunning(EWProcess::UUUUiden,s,t,u,true ,2);
   	EWRRRRWeights   = evaluateRunning(EWProcess::UUUUiden,s,t,u,false,2);
       }
       else {
   	bornRRRRWeights = evaluateRunning(EWProcess::UUUU,s,t,u,true ,2);
   	EWRRRRWeights   = evaluateRunning(EWProcess::UUUU,s,t,u,false,2);
       }
     }
     else {
       bornRRRRWeights = evaluateRunning(EWProcess::UUDD,s,t,u,true ,2);
       EWRRRRWeights   = evaluateRunning(EWProcess::UUDD,s,t,u,false,2);
     }
   }
   else {
     if(q2->id()%2==0) {
       bornRRRRWeights = evaluateRunning(EWProcess::UUDD,s,t,u,true ,2);
       EWRRRRWeights   = evaluateRunning(EWProcess::UUDD,s,t,u,false,2);
     }
     else {
       if(ident) {
   	bornRRRRWeights = evaluateRunning(EWProcess::DDDDiden,s,t,u,true ,2);
   	EWRRRRWeights   = evaluateRunning(EWProcess::DDDDiden,s,t,u,false,2);
       }
       else {
   	bornRRRRWeights = evaluateRunning(EWProcess::DDDD,s,t,u,true ,2);
   	EWRRRRWeights   = evaluateRunning(EWProcess::DDDD,s,t,u,false,2);
       }
     }
   }
   // extra terms for identical particles
   boost::numeric::ublas::matrix<complex<InvEnergy2> >
     borntChannelWeights,EWtChannelWeights;
   if(ident) {
     if(q1->id()%2==0) {
       borntChannelWeights = evaluateRunning(EWProcess::QQUU,s,u,t,true ,2);
       EWtChannelWeights   = evaluateRunning(EWProcess::QQUU,s,u,t,false,2);
     }
     else if(q1->id()==5) {
       borntChannelWeights = evaluateRunning(EWProcess::QtQtDD,s,u,t,true ,2);
       EWtChannelWeights   = evaluateRunning(EWProcess::QtQtDD,s,u,t,false,2);
     }
     else {
       borntChannelWeights = evaluateRunning(EWProcess::QQDD,s,u,t,true ,2);
       EWtChannelWeights   = evaluateRunning(EWProcess::QQDD,s,u,t,false,2);
     }
   }
   SpinorWaveFunction    q1w(p1,q1,incoming);
   SpinorWaveFunction    q2w(p2,q2,incoming);
   SpinorBarWaveFunction q3w(p3,q3,outgoing);
   SpinorBarWaveFunction q4w(p4,q4,outgoing);
   boost::numeric::ublas::matrix<Complex>
     bornME = boost::numeric::ublas::zero_matrix<Complex>(2,2),
     EWME   = boost::numeric::ublas::zero_matrix<Complex>(2,2);
   for(unsigned int iq1=0;iq1<2;++iq1) {
     q1w.reset(iq1);
     q3w.reset(iq1);
     LorentzVector<complex<Energy> > current1 =
       q1w.dimensionedWave().vectorCurrent(q3w.dimensionedWave());
     for(unsigned int iq2=0;iq2<2;++iq2) {
       q2w.reset(iq2);
       q4w.reset(iq2);
       LorentzVector<complex<Energy> > current2 =
   	q2w.dimensionedWave().vectorCurrent(q4w.dimensionedWave());
       complex<Energy2> amp = current1.dot(current2);
       vector<Complex> Cborn(2),CEW(2);
       // amplitudes
       if(iq1==0) {
  	// LL
  	if(iq2==0) {
  	  unsigned int ioff;
  	  if(q1->id()%2==0) {
  	    ioff = q2->id()%2==0 ? 0 : 2;
  	  }
  	  else {
  	    ioff = q2->id()%2==0 ? 1 : 3;
  	  }
  	  for(unsigned int ix=0;ix<2;++ix) {
  	    Cborn[ix] = amp*bornLLLLWeights(6*ix+ioff,0);
  	    CEW  [ix] = amp*  EWLLLLWeights(6*ix+ioff,0);
  	  }
  	}
  	// LR
  	else {
  	  unsigned int ioff =  q1->id()%2==0 ? 0 : 1;
  	  for(unsigned int ix=0;ix<2;++ix) {
  	    Cborn[ix] = amp*bornLLRRWeights(2*ix+ioff,0);
  	    CEW  [ix] = amp*  EWLLRRWeights(2*ix+ioff,0);
  	  }
  	}
       }
       else {
   	if(iq2==0) {
   	  unsigned int ioff=q2->id()%2==0 ? 0 : 1;
   	  for(unsigned int ix=0;ix<2;++ix) {
   	    Cborn[ix] = amp*bornRRLLWeights(2*ix+ioff,0);
   	    CEW  [ix] = amp*  EWRRLLWeights(2*ix+ioff,0);
   	  }
   	}
   	else {
   	  for(unsigned int ix=0;ix<2;++ix) {
   	    Cborn[ix] = amp*bornRRRRWeights(ix,0);
   	    CEW  [ix] = amp*  EWRRRRWeights(ix,0);
   	  }
   	}
       }
       // square
       for(unsigned int ix=0;ix<2;++ix) {
   	for(unsigned int iy=0;iy<2;++iy) {
   	  bornME(ix,iy) += Cborn[ix]*conj(Cborn[iy]);
   	  EWME  (ix,iy) += CEW  [ix]*conj(CEW  [iy]);
   	}
       }
     }
   }
   // extra u-channel pieces if identical flavours
   if(ident) {
     for(unsigned int iq1=0;iq1<2;++iq1) {
       q1w.reset(iq1);
       q4w.reset(iq1);
       LorentzVector<complex<Energy> > current1 =
 	q1w.dimensionedWave().vectorCurrent(q4w.dimensionedWave());
       if(iq1==0) {
 	q2w.reset(1);
 	q3w.reset(1);
       }
       else {
 	q2w.reset(0);
 	q3w.reset(0);
       }
       LorentzVector<complex<Energy> > current2 =
 	q2w.dimensionedWave().vectorCurrent(q3w.dimensionedWave());
       complex<Energy2> amp = current1.dot(current2);
       vector<Complex> Cborn(2),CEW(2);
       unsigned int ioff =  q1->id()%2==0 ? 0 : 1;
       for(unsigned int ix=0;ix<2;++ix) {
   	Cborn[ix] = amp*borntChannelWeights(2*ix+ioff,0);
    	CEW  [ix] = amp*  EWtChannelWeights(2*ix+ioff,0);
       }
       // square
       for(unsigned int ix=0;ix<2;++ix) {
   	for(unsigned int iy=0;iy<2;++iy) {
   	  bornME(ix,iy) += Cborn[ix]*conj(Cborn[iy]);
   	  EWME  (ix,iy) += CEW  [ix]*conj(CEW  [iy]);
  	}
       }
     }
   }
   // colour factors
   double born = 2.*real(bornME(0,0))+9.*real(bornME(1,1));
   double EW   = 2.*real(  EWME(0,0))+9.*real(  EWME(1,1));
   return EW/born;
 }
 
 double ElectroWeakReweighter::reweightqbarqbarqbarqbar() const {
   // momenta and invariants
   Lorentz5Momentum p1    = subProcess()->incoming().first ->momentum();
   tcPDPtr          qbar1 = subProcess()->incoming().first ->dataPtr();
   Lorentz5Momentum p2    = subProcess()->incoming().second->momentum();
   tcPDPtr          qbar2 = subProcess()->incoming().second->dataPtr();
   Lorentz5Momentum p3    = subProcess()->outgoing()[0]    ->momentum();
   tcPDPtr          qbar3 = subProcess()->outgoing()[0]    ->dataPtr();
   Lorentz5Momentum p4    = subProcess()->outgoing()[1]    ->momentum();
   tcPDPtr          qbar4 = subProcess()->outgoing()[1]    ->dataPtr();
   if(qbar1->id()!=qbar3->id()) {
     swap(qbar3,qbar4);
     swap(p3,p4);
   }
   assert(qbar1->id()==qbar3->id());
   assert(qbar2->id()==qbar4->id());
   Energy2 s = (p1+p2).m2();
   Energy2 t = (p1-p4).m2();
   Energy2 u = (p1-p3).m2();
   // boost to partonic rest frame
   Lorentz5Momentum psum=p1+p2;
   LorentzRotation boost(-psum.boostVector());
   p1 *= boost;
   p2 *= boost;
   p3 *= boost;
   p4 *= boost;
   p3.setMass(ZERO);
   p3.rescaleRho();
   p4.setMass(ZERO);
   p4.rescaleRho();
   // LO and EW corrected matrix element coefficients
   boost::numeric::ublas::matrix<complex<InvEnergy2> >
     bornLLLLWeights,bornLLRRWeights,bornRRLLWeights,bornRRRRWeights,
     EWLLLLWeights,EWLLRRWeights,EWRRLLWeights,EWRRRRWeights;
   bool ident = qbar1->id()==qbar2->id();
   // LL -> LL
   if((abs(qbar1->id())<=4 && abs(qbar2->id())<=4) ||
      (abs(qbar1->id())==5 && abs(qbar2->id())==5)) {
     if(!ident) {
       bornLLLLWeights = evaluateRunning(EWProcess::QQQQ,s,t,u,true ,2);
       EWLLLLWeights   = evaluateRunning(EWProcess::QQQQ,s,t,u,false,2);
     }
     else {
       bornLLLLWeights = evaluateRunning(EWProcess::QQQQiden,s,t,u,true ,2);
       EWLLLLWeights   = evaluateRunning(EWProcess::QQQQiden,s,t,u,false,2);
     }
   }
   else if(abs(qbar1->id())==5 || abs(qbar2->id())==5) {
     bornLLLLWeights = evaluateRunning(EWProcess::QtQtQQ,s,t,u,true ,2);
     EWLLLLWeights   = evaluateRunning(EWProcess::QtQtQQ,s,t,u,false,2);
   }
   else
     assert(false);
   // RR -> LL
   if(abs(qbar1->id())%2==0) {
     if(abs(qbar2->id())<5) {
       bornRRLLWeights = evaluateRunning(EWProcess::QQUU,s,t,u,true ,2);
       EWRRLLWeights   = evaluateRunning(EWProcess::QQUU,s,t,u,false,2);
     }
     else {
       bornRRLLWeights = evaluateRunning(EWProcess::QtQtUU,s,t,u,true ,2);
       EWRRLLWeights   = evaluateRunning(EWProcess::QtQtUU,s,t,u,false,2);
     }
   }
   else {
     if(abs(qbar2->id())<5) {
       bornRRLLWeights = evaluateRunning(EWProcess::QQDD,s,t,u,true ,2);
       EWRRLLWeights   = evaluateRunning(EWProcess::QQDD,s,t,u,false,2);
     }
     else {
       bornRRLLWeights = evaluateRunning(EWProcess::QtQtDD,s,t,u,true ,2);
       EWRRLLWeights   = evaluateRunning(EWProcess::QtQtDD,s,t,u,false,2);
     }
   }
   // LL -> RR
   if(abs(qbar1->id())<=4) {
     if(abs(qbar2->id())%2!=0) {
       bornLLRRWeights = evaluateRunning(EWProcess::QQDD,s,t,u,true ,2);
       EWLLRRWeights   = evaluateRunning(EWProcess::QQDD,s,t,u,false,2);
     }
     else {
       bornLLRRWeights = evaluateRunning(EWProcess::QQUU,s,t,u,true ,2);
       EWLLRRWeights   = evaluateRunning(EWProcess::QQUU,s,t,u,false,2);
     }
   }
   else {
     if(abs(qbar2->id())%2!=0) {
       bornLLRRWeights = evaluateRunning(EWProcess::QtQtDD,s,t,u,true ,2);
       EWLLRRWeights   = evaluateRunning(EWProcess::QtQtDD,s,t,u,false,2);
     }
     else {
       bornLLRRWeights = evaluateRunning(EWProcess::QtQtUU,s,t,u,true ,2);
       EWLLRRWeights   = evaluateRunning(EWProcess::QtQtUU,s,t,u,false,2);
     }
   }
   // RR -> RR
   if(abs(qbar1->id())%2==0) {
     if(abs(qbar2->id())%2==0) {
       if(ident) {
   	bornRRRRWeights = evaluateRunning(EWProcess::UUUUiden,s,t,u,true ,2);
   	EWRRRRWeights   = evaluateRunning(EWProcess::UUUUiden,s,t,u,false,2);
       }
       else {
   	bornRRRRWeights = evaluateRunning(EWProcess::UUUU,s,t,u,true ,2);
   	EWRRRRWeights   = evaluateRunning(EWProcess::UUUU,s,t,u,false,2);
       }
     }
     else {
       bornRRRRWeights = evaluateRunning(EWProcess::UUDD,s,t,u,true ,2);
       EWRRRRWeights   = evaluateRunning(EWProcess::UUDD,s,t,u,false,2);
     }
   }
   else {
     if(abs(qbar2->id())%2==0) {
       bornRRRRWeights = evaluateRunning(EWProcess::UUDD,s,t,u,true ,2);
       EWRRRRWeights   = evaluateRunning(EWProcess::UUDD,s,t,u,false,2);
     }
     else {
       if(ident) {
   	bornRRRRWeights = evaluateRunning(EWProcess::DDDDiden,s,t,u,true ,2);
   	EWRRRRWeights   = evaluateRunning(EWProcess::DDDDiden,s,t,u,false,2);
       }
       else {
   	bornRRRRWeights = evaluateRunning(EWProcess::DDDD,s,t,u,true ,2);
   	EWRRRRWeights   = evaluateRunning(EWProcess::DDDD,s,t,u,false,2);
       }
     }
   }
   // extra terms for identical particles
   boost::numeric::ublas::matrix<complex<InvEnergy2> >
     borntChannelWeights,EWtChannelWeights;
   if(ident) {
     if(abs(qbar1->id())%2==0) {
       borntChannelWeights = evaluateRunning(EWProcess::QQUU,s,u,t,true ,2);
       EWtChannelWeights   = evaluateRunning(EWProcess::QQUU,s,u,t,false,2);
     }
     else if(abs(qbar1->id())==5) {
       borntChannelWeights = evaluateRunning(EWProcess::QtQtDD,s,u,t,true ,2);
       EWtChannelWeights   = evaluateRunning(EWProcess::QtQtDD,s,u,t,false,2);
     }
     else {
       borntChannelWeights = evaluateRunning(EWProcess::QQDD,s,u,t,true ,2);
       EWtChannelWeights   = evaluateRunning(EWProcess::QQDD,s,u,t,false,2);
     }
   }
   SpinorBarWaveFunction qbar1w(p1,qbar1,incoming);
   SpinorBarWaveFunction qbar2w(p2,qbar2,incoming);
   SpinorWaveFunction    qbar3w(p3,qbar3,outgoing);
   SpinorWaveFunction    qbar4w(p4,qbar4,outgoing);
   boost::numeric::ublas::matrix<Complex>
     bornME = boost::numeric::ublas::zero_matrix<Complex>(2,2),
     EWME   = boost::numeric::ublas::zero_matrix<Complex>(2,2);
   for(unsigned int iq1=0;iq1<2;++iq1) {
     qbar1w.reset(iq1);
     qbar3w.reset(iq1);
     LorentzVector<complex<Energy> > current1 =
       qbar3w.dimensionedWave().vectorCurrent(qbar1w.dimensionedWave());
     for(unsigned int iq2=0;iq2<2;++iq2) {
       qbar2w.reset(iq2);
       qbar4w.reset(iq2);
       LorentzVector<complex<Energy> > current2 =
   	qbar4w.dimensionedWave().vectorCurrent(qbar2w.dimensionedWave());
       complex<Energy2> amp = current1.dot(current2);
       vector<Complex> Cborn(2),CEW(2);
       // amplitudes
       if(iq1==1) {
  	// LL
  	if(iq2==1) {
  	  unsigned int ioff;
  	  if(abs(qbar1->id())%2==0) {
  	    ioff = abs(qbar2->id())%2==0 ? 0 : 2;
  	  }
  	  else {
  	    ioff = abs(qbar2->id())%2==0 ? 1 : 3;
  	  }
  	  for(unsigned int ix=0;ix<2;++ix) {
  	    Cborn[ix] = amp*bornLLLLWeights(6*ix+ioff,0);
  	    CEW  [ix] = amp*  EWLLLLWeights(6*ix+ioff,0);
  	  }
  	}
  	// LR
  	else {
  	  unsigned int ioff =  abs(qbar1->id())%2==0 ? 0 : 1;
  	  for(unsigned int ix=0;ix<2;++ix) {
  	    Cborn[ix] = amp*bornLLRRWeights(2*ix+ioff,0);
  	    CEW  [ix] = amp*  EWLLRRWeights(2*ix+ioff,0);
  	  }
  	}
       }
       else {
   	if(iq2==1) {
   	  unsigned int ioff=abs(qbar2->id())%2==0 ? 0 : 1;
   	  for(unsigned int ix=0;ix<2;++ix) {
   	    Cborn[ix] = amp*bornRRLLWeights(2*ix+ioff,0);
   	    CEW  [ix] = amp*  EWRRLLWeights(2*ix+ioff,0);
   	  }
   	}
   	else {
   	  for(unsigned int ix=0;ix<2;++ix) {
   	    Cborn[ix] = amp*bornRRRRWeights(ix,0);
   	    CEW  [ix] = amp*  EWRRRRWeights(ix,0);
   	  }
   	}
       }
       // square
       for(unsigned int ix=0;ix<2;++ix) {
  	for(unsigned int iy=0;iy<2;++iy) {
  	  bornME(ix,iy) += Cborn[ix]*conj(Cborn[iy]);
  	  EWME  (ix,iy) += CEW  [ix]*conj(CEW  [iy]);
  	}
       }
     }
   }
   // extra u-channel pieces if identical flavours
   if(ident) {
     for(unsigned int iq1=0;iq1<2;++iq1) {
       qbar1w.reset(iq1);
       qbar4w.reset(iq1);
       LorentzVector<complex<Energy> > current1 =
 	qbar4w.dimensionedWave().vectorCurrent(qbar1w.dimensionedWave());
       if(iq1==0) {
 	qbar2w.reset(1);
 	qbar3w.reset(1);
       }
       else {
 	qbar2w.reset(0);
 	qbar3w.reset(0);
       }
       LorentzVector<complex<Energy> > current2 =
 	qbar3w.dimensionedWave().vectorCurrent(qbar2w.dimensionedWave());
       complex<Energy2> amp = current1.dot(current2);
       vector<Complex> Cborn(2),CEW(2);
       unsigned int ioff =  abs(qbar1->id())%2==0 ? 0 : 1;
       for(unsigned int ix=0;ix<2;++ix) {
   	Cborn[ix] = amp*borntChannelWeights(2*ix+ioff,0);
    	CEW  [ix] = amp*  EWtChannelWeights(2*ix+ioff,0);
       }
       // square
       for(unsigned int ix=0;ix<2;++ix) {
   	for(unsigned int iy=0;iy<2;++iy) {
   	  bornME(ix,iy) += Cborn[ix]*conj(Cborn[iy]);
   	  EWME  (ix,iy) += CEW  [ix]*conj(CEW  [iy]);
  	}
       }
     }
   }
   // colour factors
   double born = 2.*real(bornME(0,0))+9.*real(bornME(1,1));
   double EW   = 2.*real(  EWME(0,0))+9.*real(  EWME(1,1));
   return EW/born;
 }
diff --git a/Utilities/Maths.h b/Utilities/Maths.h
--- a/Utilities/Maths.h
+++ b/Utilities/Maths.h
@@ -1,69 +1,70 @@
 // -*- C++ -*-
 //
 // Maths.h is a part of Herwig - A multi-purpose Monte Carlo event generator
 // Copyright (C) 2002-2011 The Herwig Collaboration
 //
 // Herwig is licenced under version 2 of the GPL, see COPYING for details.
 // Please respect the MCnet academic guidelines, see GUIDELINES for details.
 //
 #ifndef HERWIG_Math_H
 #define HERWIG_Math_H
 
 #include <cmath>
 #include <vector>
 #include "ThePEG/Config/Complex.h"
 #include "ThePEG/Utilities/Maths.h"
+#include "ThePEG/Config/TemplateTools.h"
 
 namespace Herwig {
 using ThePEG::Complex;
 using std::complex;
 
 /** The Math namespace includes the declaration of some useful
  *  mathematical functions. */
 namespace Math {
 
   /**
    * The dilog function taken from FORTRAN Herwig
    */
   Complex Li2(Complex);
 
   /**
    * The real part of the dilog function taken from FORTRAN Herwig
    */
   long double ReLi2(long double);
   
   /**
    * Fold angles into the range (0,2 Pi)
    */
   inline double angleZeroTo2Pi(double angle) {
     double ret = fmod(angle, 2 * M_PI);
     if (ret < 0) ret += 2 * M_PI;
     return ret;
   }
 
   /**
    * Fold angles into the range (-Pi,Pi)
    */
   inline double angleMinusPiToPi(double angle) {
     double ret = angleZeroTo2Pi(angle);
     if (ret > M_PI) ret -= 2 * M_PI;
     return ret;
   }
 
   /**
    * Calculates the (lower) median of a vector of T objects. T has to be
    * comparable, i.e. T::operator< must be defined.
    */
   template <typename T>
   inline T median(std::vector<T> v) {
     if (v.empty()) return T();
     sort ( v.begin(), v.end() );
     const size_t N = v.size();
     return (N % 2) ? v.at((N+1)/2 - 1) : v.at(N/2 - 1);
   }
 
 }
 
 }
 
 #endif /* HERWIG_Math_H */