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diff --git a/Decay/WeakCurrents/TwoKaonCzyzCurrent.cc b/Decay/WeakCurrents/TwoKaonCzyzCurrent.cc
--- a/Decay/WeakCurrents/TwoKaonCzyzCurrent.cc
+++ b/Decay/WeakCurrents/TwoKaonCzyzCurrent.cc
@@ -1,764 +1,765 @@
// -*- C++ -*-
//
// This is the implementation of the non-inlined, non-templated member
// functions of the TwoKaonCzyzCurrent class.
//
#include "TwoKaonCzyzCurrent.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/EventRecord/Particle.h"
#include "ThePEG/Repository/UseRandom.h"
#include "ThePEG/Repository/EventGenerator.h"
#include "ThePEG/Utilities/DescribeClass.h"
#include "Herwig/Decay/ResonanceHelpers.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include <cmath>
using namespace Herwig;
HERWIG_INTERPOLATOR_CLASSDESC(TwoKaonCzyzCurrent,double,Energy2)
TwoKaonCzyzCurrent::TwoKaonCzyzCurrent()
// changed parameters from 1002.0279, Fit 2
// substituted by own fit
: betaRho_(2.19680665014), betaOmega_(2.69362046884), betaPhi_(1.94518176513),
- nMax_(200), etaPhi_(1.055), gammaOmega_(0.5), gammaPhi_(0.2), mpi_(140.*MeV), eMax_(10.*GeV) {
+ nMax_(200), etaPhi_(1.055), gammaOmega_(0.5), gammaPhi_(0.2), mpi_(140.*MeV), eMax_(-GeV) {
using Constants::pi;
// rho parameter
rhoMag_ = {1.1148916618504967,0.050374779737077324, 0.014908906283692132,0.03902475997619905,0.038341465215871416};
rhoPhase_ = {0 , pi, pi, pi, pi};
rhoMasses_ = {775.49*MeV,1520.6995754050117*MeV,1740.9719246639341*MeV,1992.2811314327789*MeV};
rhoWidths_ = {149.4 *MeV,213.41728317817743*MeV, 84.12224414791908*MeV,289.9733272437917*MeV};
// omega parameters
omegaMag_ = {1.3653229680598022, 0.02775156567495144, 0.32497165559032715,1.3993153161869765};
omegaPhase_ = {0 , pi, pi, 0,pi};
omegaMasses_ = {782.65*MeV,1414.4344268685891*MeV,1655.375231284883*MeV};
omegaWidths_ = {8.490000000000001*MeV, 85.4413887755723*MeV, 160.31760444832305*MeV};
// phi parameters
phiMag_ = {0.965842498579515,0.002379766320723148,0.1956211640216197,0.16527771485190898};
phiPhase_ = {0. ,pi ,pi ,0. ,0.};
phiMasses_ = {1019.4209171596993*MeV,1594.759278457624*MeV,2156.971341201067*MeV};
phiWidths_ = {4.252653332329334*MeV, 28.741821847408196*MeV,673.7556174184005*MeV};
// set up for the modes in the base class
addDecayMode(2,-1);
addDecayMode(1,-1);
addDecayMode(2,-2);
addDecayMode(1,-1);
addDecayMode(2,-2);
setInitialModes(5);
}
IBPtr TwoKaonCzyzCurrent::clone() const {
return new_ptr(*this);
}
IBPtr TwoKaonCzyzCurrent::fullclone() const {
return new_ptr(*this);
}
void TwoKaonCzyzCurrent::persistentOutput(PersistentOStream & os) const {
os << betaRho_ << betaOmega_ << betaPhi_
<< rhoWgt_ << rhoMag_ << rhoPhase_
<< ounit(rhoMasses_,GeV) << ounit(rhoWidths_,GeV)
<< phiWgt_ << phiMag_ << phiPhase_
<< ounit(phiMasses_,GeV) << ounit(phiWidths_,GeV)
<< ounit(mass_,GeV) << ounit(width_,GeV) << coup_
<< dh_ << ounit(hres_,GeV2) << ounit(h0_,GeV2)
<< nMax_ << etaPhi_ << gammaOmega_ << gammaPhi_ << ounit(mpi_,GeV)
<< ounit(eMax_,GeV) << fKI0Re_ << fKI0Im_ << fKI1Re_ << fKI1Im_;
}
void TwoKaonCzyzCurrent::persistentInput(PersistentIStream & is, int) {
is >> betaRho_ >> betaOmega_ >> betaPhi_
>> rhoWgt_ >> rhoMag_ >> rhoPhase_
>> iunit(rhoMasses_,GeV) >> iunit(rhoWidths_,GeV)
>> phiWgt_ >> phiMag_ >> phiPhase_
>> iunit(phiMasses_,GeV) >> iunit(phiWidths_,GeV)
>> iunit(mass_,GeV) >> iunit(width_,GeV) >> coup_
>> dh_ >> iunit(hres_,GeV2) >> iunit(h0_,GeV2)
>> nMax_ >> etaPhi_ >> gammaOmega_ >> gammaPhi_ >> iunit(mpi_,GeV)
>> iunit(eMax_,GeV) >> fKI0Re_ >> fKI0Im_ >> fKI1Re_ >> fKI1Im_;
}
// The following static variable is needed for the type
// description system in ThePEG.
DescribeClass<TwoKaonCzyzCurrent,WeakCurrent>
describeHerwigTwoKaonCzyzCurrent("Herwig::TwoKaonCzyzCurrent", "HwWeakCurrents.so");
void TwoKaonCzyzCurrent::Init() {
static ClassDocumentation<TwoKaonCzyzCurrent> documentation
("The TwoKaonCzyzCurrent class uses the currents from "
"PRD 81 094014 for the weak current with two kaons",
"The current for two kaons from \\cite{Czyz:2010hj} was used.",
"%\\cite{Czyz:2010hj}\n"
"\\bibitem{Czyz:2010hj}\n"
"H.~Czyz, A.~Grzelinska and J.~H.~Kuhn,\n"
"%``Narrow resonances studies with the radiative return method,''\n"
"Phys.\\ Rev.\\ D {\\bf 81} (2010) 094014\n"
"doi:10.1103/PhysRevD.81.094014\n"
"[arXiv:1002.0279 [hep-ph]].\n"
"%%CITATION = doi:10.1103/PhysRevD.81.094014;%%\n"
"%28 citations counted in INSPIRE as of 30 Jul 2018\n");
static ParVector<TwoKaonCzyzCurrent,Energy> interfaceRhoMasses
("RhoMasses",
"The masses of the different rho resonances for the pi pi channel",
&TwoKaonCzyzCurrent::rhoMasses_, MeV, -1, 775.8*MeV, ZERO, 10000.*MeV,
false, false, true);
static ParVector<TwoKaonCzyzCurrent,Energy> interfaceRhoWidths
("RhoWidths",
"The widths of the different rho resonances for the pi pi channel",
&TwoKaonCzyzCurrent::rhoWidths_, MeV, -1, 150.3*MeV, ZERO, 1000.*MeV,
false, false, true);
static ParVector<TwoKaonCzyzCurrent,double> interfaceRhoMagnitude
("RhoMagnitude",
"Magnitude of the weight of the different resonances for the pi pi channel",
&TwoKaonCzyzCurrent::rhoMag_, -1, 0., 0, 0,
false, false, Interface::nolimits);
static ParVector<TwoKaonCzyzCurrent,double> interfaceRhoPhase
("RhoPhase",
"Phase of the weight of the different resonances for the pi pi channel",
&TwoKaonCzyzCurrent::rhoPhase_, -1, 0., 0, 0,
false, false, Interface::nolimits);
static ParVector<TwoKaonCzyzCurrent,Energy> interfaceOmegaMasses
("OmegaMasses",
"The masses of the different omega resonances for the pi pi channel",
&TwoKaonCzyzCurrent::omegaMasses_, MeV, -1, 775.8*MeV, ZERO, 10000.*MeV,
false, false, true);
static ParVector<TwoKaonCzyzCurrent,Energy> interfaceOmegaWidths
("OmegaWidths",
"The widths of the different omega resonances for the pi pi channel",
&TwoKaonCzyzCurrent::omegaWidths_, MeV, -1, 150.3*MeV, ZERO, 1000.*MeV,
false, false, true);
static ParVector<TwoKaonCzyzCurrent,double> interfaceOmegaMagnitude
("OmegaMagnitude",
"Magnitude of the weight of the different resonances for the pi pi channel",
&TwoKaonCzyzCurrent::omegaMag_, -1, 0., 0, 0,
false, false, Interface::nolimits);
static ParVector<TwoKaonCzyzCurrent,double> interfaceOmegaPhase
("OmegaPhase",
"Phase of the weight of the different resonances for the pi pi channel",
&TwoKaonCzyzCurrent::omegaPhase_, -1, 0., 0, 0,
false, false, Interface::nolimits);
static ParVector<TwoKaonCzyzCurrent,Energy> interfacePhiMasses
("PhiMasses",
"The masses of the different phi resonances for the pi pi channel",
&TwoKaonCzyzCurrent::phiMasses_, MeV, -1, 775.8*MeV, ZERO, 10000.*MeV,
false, false, true);
static ParVector<TwoKaonCzyzCurrent,Energy> interfacePhiWidths
("PhiWidths",
"The widths of the different phi resonances for the pi pi channel",
&TwoKaonCzyzCurrent::phiWidths_, MeV, -1, 150.3*MeV, ZERO, 1000.*MeV,
false, false, true);
static ParVector<TwoKaonCzyzCurrent,double> interfacePhiMagnitude
("PhiMagnitude",
"Magnitude of the weight of the different resonances for the pi pi channel",
&TwoKaonCzyzCurrent::phiMag_, -1, 0., 0, 0,
false, false, Interface::nolimits);
static ParVector<TwoKaonCzyzCurrent,double> interfacePhiPhase
("PhiPhase",
"Phase of the weight of the different resonances for the pi pi channel",
&TwoKaonCzyzCurrent::phiPhase_, -1, 0., 0, 0,
false, false, Interface::nolimits);
static Parameter<TwoKaonCzyzCurrent,unsigned int> interfacenMax
("nMax",
"The maximum number of resonances to include in the sum,"
" should be approx infinity",
&TwoKaonCzyzCurrent::nMax_, 200, 10, 10000,
false, false, Interface::limited);
static Parameter<TwoKaonCzyzCurrent,double> interfacebetaRho
("betaRho",
"The beta parameter for the rho couplings",
&TwoKaonCzyzCurrent::betaRho_, 2.23, 0.0, 100.,
false, false, Interface::limited);
static Parameter<TwoKaonCzyzCurrent,double> interfacebetaOmega
("betaOmega",
"The beta parameter for the rho couplings",
&TwoKaonCzyzCurrent::betaOmega_, 2.23, 0.0, 100.,
false, false, Interface::limited);
static Parameter<TwoKaonCzyzCurrent,double> interfacebetaPhi
("betaPhi",
"The beta parameter for the phi couplings",
&TwoKaonCzyzCurrent::betaPhi_, 1.97, 0.0, 100.,
false, false, Interface::limited);
static Parameter<TwoKaonCzyzCurrent,double> interfaceEtaPhi
("EtaPhi",
"The eta_phi mixing parameter",
&TwoKaonCzyzCurrent::etaPhi_, 1.04, 0.0, 10.0,
false, false, Interface::limited);
static Parameter<TwoKaonCzyzCurrent,double> interfacegammaOmega
("gammaOmega",
"The gamma parameter for the widths of omega resonances",
&TwoKaonCzyzCurrent::gammaOmega_, 0.5, 0.0, 1.0,
false, false, Interface::limited);
static Parameter<TwoKaonCzyzCurrent,double> interfacegammaPhi
("gammaPhi",
"The gamma parameter for the widths of phi resonances",
&TwoKaonCzyzCurrent::gammaPhi_, 0.2, 0.0, 1.0,
false, false, Interface::limited);
}
void TwoKaonCzyzCurrent::doinit() {
WeakCurrent::doinit();
// check consistency of parametrers
if(rhoMasses_.size() != rhoWidths_.size() ||
omegaMasses_.size() != omegaWidths_.size() ||
phiMasses_.size() != phiWidths_.size() )
throw InitException() << "Inconsistent parameters in TwoKaonCzyzCurrent"
<< "::doinit()" << Exception::abortnow;
// weights for the rho channels
if(rhoMag_.size()!=rhoPhase_.size())
throw InitException() << "The vectors containing the weights and phase for the"
<< " rho channel must be the same size in "
<< "TwoKaonCzyzCurrent::doinit()" << Exception::runerror;
// combine mags and phase
for(unsigned int ix=0;ix<rhoMag_.size();++ix) {
rhoWgt_.push_back(rhoMag_[ix]*(cos(rhoPhase_[ix])+Complex(0.,1.)*sin(rhoPhase_[ix])));
}
for(unsigned int ix=0;ix<omegaMag_.size();++ix) {
omegaWgt_.push_back(omegaMag_[ix]*(cos(omegaPhase_[ix])+Complex(0.,1.)*sin(omegaPhase_[ix])));
}
for(unsigned int ix=0;ix<phiMag_.size();++ix) {
phiWgt_.push_back(phiMag_[ix]*(cos(phiPhase_[ix])+Complex(0.,1.)*sin(phiPhase_[ix])));
}
// pion mass
mpi_ = getParticleData(211)->mass();
// rho masses and couplings
double gamB(std::tgamma(2.-betaRho_));
mass_.push_back(vector<Energy>());
width_.push_back(vector<Energy>());
coup_.push_back(vector<Complex>());
Complex total(0.);
for(unsigned int ix=0;ix<nMax_;++ix) {
// this is gam(2-beta+n)/gam(n+1)
if(ix>0) {
gamB *= ((1.-betaRho_+double(ix)))/double(ix);
}
Complex c_n = std::tgamma(betaRho_-0.5) /(0.5+double(ix)) / sqrt(Constants::pi) *
sin(Constants::pi*(betaRho_-1.-double(ix)))/Constants::pi*gamB;
if(ix%2!=0) c_n *= -1.;
// couplings
coup_[0].push_back(c_n);
total+=c_n;
// set the masses and widths
// calc for higher resonances
if(ix>=rhoMasses_.size()) {
mass_ [0].push_back(rhoMasses_[0]*sqrt(1.+2.*double(ix)));
width_[0].push_back(rhoWidths_[0]/rhoMasses_[0]*mass_[0].back());
}
// input for lower ones
else {
mass_ [0].push_back(rhoMasses_[ix]);
width_[0].push_back(rhoWidths_[ix]);
}
// parameters for the gs propagators
hres_.push_back(Resonance::Hhat(sqr(mass_[0].back()),
mass_[0].back(),width_[0].back(),mpi_,mpi_));
dh_ .push_back(Resonance::dHhatds(mass_[0].back(),width_[0].back(),mpi_,mpi_));
h0_ .push_back(Resonance::H(ZERO,mass_[0].back(),width_[0].back(),
mpi_,mpi_,dh_.back(),hres_.back()));
}
for(unsigned int ix=0;ix<rhoWgt_.size();++ix) {
total += rhoWgt_[ix]-coup_[0][ix];
coup_[0][ix] = rhoWgt_[ix];
}
coup_[0][rhoWgt_.size()] += 1. - total;
// omega masses and couplings
gamB = std::tgamma(2.-betaOmega_);
mass_.push_back(vector<Energy>());
width_.push_back(vector<Energy>());
coup_.push_back(vector<Complex>());
total=0.;
for(unsigned int ix=0;ix<nMax_;++ix) {
// this is gam(2-beta+n)/gam(n+1)
if(ix>0) {
gamB *= ((1.-betaOmega_+double(ix)))/double(ix);
}
Complex c_n = std::tgamma(betaOmega_-0.5) /(0.5+double(ix)) / sqrt(Constants::pi) *
sin(Constants::pi*(betaOmega_-1.-double(ix)))/Constants::pi*gamB;
if(ix%2!=0) c_n *= -1.;
// couplings
coup_[1].push_back(c_n);
total+=c_n;
// set the masses and widths
// calc for higher resonances
if(ix>=omegaMasses_.size()) {
mass_ [1].push_back(omegaMasses_[0]*sqrt(1.+2.*double(ix)));
width_[1].push_back(gammaOmega_*mass_[1].back());
}
// input for lower ones
else {
mass_ [1].push_back(omegaMasses_[ix]);
width_[1].push_back(omegaWidths_[ix]);
}
}
for(unsigned int ix=0;ix<omegaWgt_.size();++ix) {
total += omegaWgt_[ix]-coup_[1][ix];
coup_[1][ix] = omegaWgt_[ix];
}
coup_[1][omegaWgt_.size()] += 1. - total;
// phi masses and couplings
gamB = std::tgamma(2.-betaPhi_);
mass_.push_back(vector<Energy>());
width_.push_back(vector<Energy>());
coup_.push_back(vector<Complex>());
total=0.;
for(unsigned int ix=0;ix<nMax_;++ix) {
// this is gam(2-beta+n)/gam(n+1)
if(ix>0) {
gamB *= ((1.-betaPhi_+double(ix)))/double(ix);
}
Complex c_n = std::tgamma(betaPhi_-0.5) /(0.5+double(ix)) / sqrt(Constants::pi) *
sin(Constants::pi*(betaPhi_-1.-double(ix)))/Constants::pi*gamB;
if(ix%2!=0) c_n *= -1.;
// couplings
coup_[2].push_back(c_n);
total +=c_n;
// set the masses and widths
// calc for higher resonances
if(ix>=phiMasses_.size()) {
mass_ [2].push_back(phiMasses_[0]*sqrt(1.+2.*double(ix)));
width_[2].push_back(gammaPhi_*mass_[2].back());
}
// input for lower ones
else {
mass_ [2].push_back(phiMasses_[ix]);
width_[2].push_back(phiWidths_[ix]);
}
}
for(unsigned int ix=0;ix<phiWgt_.size();++ix) {
total += phiWgt_[ix]-coup_[2][ix];
coup_[2][ix] = phiWgt_[ix];
}
coup_[2][phiWgt_.size()] += 1. - total;
}
void TwoKaonCzyzCurrent::constructInterpolators() const {
// construct the interpolators
vector<Energy2> en;
vector<double> re0,im0;
vector<double> re1,im1;
Energy mK = getParticleData(ParticleID::Kplus)->mass();
- Energy2 step = (sqr(eMax_)-sqr(2.*mK))/nMax_;
+ Energy maxE = eMax_>ZERO ? eMax_ : 10.*GeV;
+ Energy2 step = (sqr(maxE)-sqr(2.*mK))/nMax_;
Energy2 Q2 = sqr(2.*mK);
for(unsigned int ix=0;ix<nMax_+1;++ix) {
Complex value = FkaonRemainderI1(Q2);
re1.push_back(value.real());
im1.push_back(value.imag());
value = FkaonRemainderI0(Q2,mK,mK);
re0.push_back(value.real());
im0.push_back(value.imag());
en.push_back(Q2);
Q2+=step;
}
fKI0Re_ = make_InterpolatorPtr(re0,en,3);
fKI0Im_ = make_InterpolatorPtr(im0,en,3);
fKI1Re_ = make_InterpolatorPtr(re1,en,3);
fKI1Im_ = make_InterpolatorPtr(im1,en,3);
}
// complete the construction of the decay mode for integration
bool TwoKaonCzyzCurrent::createMode(int icharge, tcPDPtr resonance,
FlavourInfo flavour,
unsigned int imode,PhaseSpaceModePtr mode,
unsigned int iloc,int ires,
PhaseSpaceChannel phase, Energy upp ) {
// check the charge
if((imode==0 && abs(icharge)!=3) ||
(imode>0 && icharge !=0)) return false;
// check the total isospin
if(flavour.I!=IsoSpin::IUnknown) {
if(flavour.I!=IsoSpin::IOne && flavour.I!=IsoSpin::IZero ) return false;
}
// check I_3
if(flavour.I3!=IsoSpin::I3Unknown&&flavour.I==IsoSpin::IOne) {
switch(flavour.I3) {
case IsoSpin::I3Zero:
if(imode==0) return false;
break;
case IsoSpin::I3One:
if(imode!=0 || icharge ==-3) return false;
break;
case IsoSpin::I3MinusOne:
if(imode!=0 || icharge ==3) return false;
break;
default:
return false;
}
}
if(imode==0 && (flavour.strange != Strangeness::Unknown and flavour.strange != Strangeness::Zero )) return false;
if(imode!=0 && (flavour.strange != Strangeness::Unknown and flavour.strange != Strangeness::Zero and
flavour.strange != Strangeness::ssbar )) return false;
if(flavour.charm != Charm::Unknown and flavour.charm != Charm::Zero ) return false;
if(flavour.bottom != Beauty::Unknown and flavour.bottom !=Beauty::Zero ) return false;
// make sure that the decays are kinematically allowed
tPDPtr part[2];
if(imode==0) {
part[0]=getParticleData(ParticleID::Kplus);
part[1]=getParticleData(ParticleID::Kbar0);
}
else if(imode==1|| imode==2) {
part[0]=getParticleData(ParticleID::K_S0);
part[1]=getParticleData(ParticleID::K_L0);
}
else {
part[0]=getParticleData(ParticleID::Kplus);
part[1]=getParticleData(ParticleID::Kminus);
}
Energy min(part[0]->massMin()+part[1]->massMin());
if(min>upp) return false;
- eMax_=upp;
+ eMax_=max(upp,eMax_);
// set the resonances
vector<tPDPtr> res;
if(icharge==0) {
res.push_back(getParticleData(113 ));
res.push_back(getParticleData(100113));
res.push_back(getParticleData(30113 ));
res.push_back(getParticleData( 223));
res.push_back(getParticleData( 333));
}
else {
res.push_back(getParticleData(213 ));
res.push_back(getParticleData(100213));
res.push_back(getParticleData(30213 ));
if(icharge==-3) {
for(unsigned int ix=0;ix<3;++ix) {
if(res[ix]&&res[ix]->CC()) res[ix]=res[ix]->CC();
}
}
}
// create the channels
for(unsigned int ix=0;ix<res.size();++ix) {
if(!res[ix]) continue;
if(resonance && resonance != res[ix]) continue;
if(flavour.I!=IsoSpin::IUnknown && flavour.I!=IsoSpin::IOne && ix < 3) continue;
if(flavour.I!=IsoSpin::IUnknown && flavour.I!=IsoSpin::IZero && ix >=3) continue;
PhaseSpaceChannel newChannel((PhaseSpaceChannel(phase),ires,res[ix],ires+1,iloc+1,ires+1,iloc+2));
mode->addChannel(newChannel);
}
// reset the masses in the intergrators
for(unsigned int ix=0;ix<3;++ix) {
if(ix<rhoMasses_.size()&&res[ix]) {
mode->resetIntermediate(res[ix],rhoMasses_[ix],rhoWidths_[ix]);
}
}
if(res.size()>3) {
mode->resetIntermediate(res[3],omegaMasses_[0],omegaWidths_[0]);
mode->resetIntermediate(res[4],phiMasses_ [0], phiWidths_[0]);
}
// return if successful
return true;
}
// the particles produced by the current
tPDVector TwoKaonCzyzCurrent::particles(int icharge, unsigned int imode,
int,int) {
tPDVector output(2);
if(imode==0) {
output[0]=getParticleData(ParticleID::Kplus);
output[1]=getParticleData(ParticleID::K0);
}
else if(imode==1||imode==2) {
output[0]=getParticleData(ParticleID::K_S0);
output[1]=getParticleData(ParticleID::K_L0);
}
else {
output[0]=getParticleData(ParticleID::Kplus );
output[1]=getParticleData(ParticleID::Kminus);
}
if(icharge==-3) {
for(unsigned int ix=0;ix<output.size();++ix) {
if(output[ix]->CC()) output[ix]=output[ix]->CC();
}
}
return output;
}
// hadronic current
vector<LorentzPolarizationVectorE>
TwoKaonCzyzCurrent::current(tcPDPtr resonance,
FlavourInfo flavour,
const int imode, const int ichan,Energy & scale,
const tPDVector & outgoing,
const vector<Lorentz5Momentum> & momenta,
DecayIntegrator::MEOption) const {
useMe();
// check the total isospin
if(flavour.I!=IsoSpin::IUnknown) {
if(flavour.I!=IsoSpin::IOne && flavour.I!=IsoSpin::IZero )
return vector<LorentzPolarizationVectorE>();
}
// check I_3
int icharge = outgoing[0]->iCharge()+outgoing[1]->iCharge();
if(flavour.I3!=IsoSpin::I3Unknown&&flavour.I==IsoSpin::IOne) {
switch(flavour.I3) {
case IsoSpin::I3Zero:
if(imode==0) return vector<LorentzPolarizationVectorE>();
break;
case IsoSpin::I3One:
if(imode!=0 || icharge ==-3) return vector<LorentzPolarizationVectorE>();
break;
case IsoSpin::I3MinusOne:
if(imode!=0 || icharge ==3) return vector<LorentzPolarizationVectorE>();
break;
default:
return vector<LorentzPolarizationVectorE>();
}
}
// momentum difference and sum of the mesons
Lorentz5Momentum pdiff(momenta[0]-momenta[1]);
Lorentz5Momentum psum (momenta[0]+momenta[1]);
psum.rescaleMass();
scale=psum.mass();
// mass2 of vector intermediate state
Energy2 q2(psum.m2());
double dot(psum*pdiff/q2);
psum *=dot;
// calculate the current
Complex FK = Fkaon(q2,imode,ichan,
flavour.I,flavour.strange,resonance,
momenta[0].mass(),momenta[1].mass());
// compute the current
pdiff -= psum;
return vector<LorentzPolarizationVectorE>(1,FK*pdiff);
}
bool TwoKaonCzyzCurrent::accept(vector<int> id) {
// check there are only two particles
if(id.size()!=2) return false;
// pion modes
if((id[0]==ParticleID::Kminus && id[1]==ParticleID::K0) ||
(id[0]==ParticleID::K0 && id[1]==ParticleID::Kminus) ||
(id[0]==ParticleID::Kplus && id[1]==ParticleID::Kbar0) ||
(id[0]==ParticleID::Kbar0 && id[1]==ParticleID::Kplus))
return true;
else if((id[0]==ParticleID::Kminus && id[1]==ParticleID::Kplus) ||
(id[0]==ParticleID::Kplus && id[1]==ParticleID::Kminus))
return true;
else if((id[0]==ParticleID::K_S0 && id[1]==ParticleID::K_L0) ||
(id[0]==ParticleID::K_L0 && id[1]==ParticleID::K_S0))
return true;
else
return false;
}
// the decay mode
unsigned int TwoKaonCzyzCurrent::decayMode(vector<int> idout) {
unsigned int nk0(0),nkp(0);
for(unsigned int ix=0;ix<idout.size();++ix) {
if(abs(idout[ix])==ParticleID::Kplus) ++nkp;
else if(abs(idout[ix])==ParticleID::K0 ||
idout[ix]==ParticleID::K_L0 ||idout[ix]==ParticleID::K_S0 ) ++nk0;
}
if(nkp==1&&nk0==1) return 0;
else if(nkp==2) return 3;
else if(nk0==2) return 1;
else return false;
}
// output the information for the database
void TwoKaonCzyzCurrent::dataBaseOutput(ofstream & output,bool header,
bool create) const {
if(header) output << "update decayers set parameters=\"";
if(create) output << "create Herwig::TwoKaonCzyzCurrent "
<< name() << " HwWeakCurrents.so\n";
unsigned int ix;
for(ix=0;ix<rhoMasses_.size();++ix) {
if(ix<3) output << "newdef ";
else output << "insert ";
output << name() << ":RhoMasses " << ix << " " << rhoMasses_[ix]/MeV << "\n";
}
for(ix=0;ix<rhoWidths_.size();++ix) {
if(ix<3) output << "newdef ";
else output << "insert ";
output << name() << ":RhoWidths " << ix << " " << rhoWidths_[ix]/MeV << "\n";
}
for(ix=0;ix<rhoWgt_.size();++ix) {
if(ix<5) output << "newdef ";
else output << "insert ";
output << name() << ":RhoMagnitude " << ix << " " << rhoMag_[ix] << "\n";
if(ix<5) output << "newdef ";
else output << "insert ";
output << name() << ":RhoPhase " << ix << " " << rhoPhase_[ix] << "\n";
}
for(ix=0;ix<omegaMasses_.size();++ix) {
if(ix<3) output << "newdef ";
else output << "insert ";
output << name() << ":OmegaMasses " << ix << " " << omegaMasses_[ix]/MeV << "\n";
}
for(ix=0;ix<omegaWidths_.size();++ix) {
if(ix<3) output << "newdef ";
else output << "insert ";
output << name() << ":OmegaWidths " << ix << " " << omegaWidths_[ix]/MeV << "\n";
}
for(ix=0;ix<omegaWgt_.size();++ix) {
if(ix<5) output << "newdef ";
else output << "insert ";
output << name() << ":OmegaMagnitude " << ix << " " << omegaMag_[ix] << "\n";
if(ix<5) output << "newdef ";
else output << "insert ";
output << name() << ":OmegaPhase " << ix << " " << omegaPhase_[ix] << "\n";
}
for(ix=0;ix<phiMasses_.size();++ix) {
if(ix<2) output << "newdef ";
else output << "insert ";
output << name() << ":PhiMasses " << ix << " " << phiMasses_[ix]/MeV << "\n";
}
for(ix=0;ix<phiWidths_.size();++ix) {
if(ix<2) output << "newdef ";
else output << "insert ";
output << name() << ":PhiWidths " << ix << " " << phiWidths_[ix]/MeV << "\n";
}
for(ix=0;ix<phiWgt_.size();++ix) {
if(ix<4) output << "newdef ";
else output << "insert ";
output << name() << ":PhiMagnitude " << ix << " " << phiMag_[ix] << "\n";
if(ix<4) output << "newdef ";
else output << "insert ";
output << name() << ":PhiPhase " << ix << " " << phiPhase_[ix] << "\n";
}
output << "newdef " << name() << ":betaRho " << betaRho_ << "\n";
output << "newdef " << name() << ":betaOmega " << betaOmega_ << "\n";
output << "newdef " << name() << ":betaPhi " << betaPhi_ << "\n";
output << "newdef " << name() << ":gammaOmega " << gammaOmega_ << "\n";
output << "newdef " << name() << ":gammaPhi " << gammaPhi_ << "\n";
output << "newdef " << name() << ":etaPhi " << etaPhi_ << "\n";
output << "newdef " << name() << ":nMax " << nMax_ << "\n";
WeakCurrent::dataBaseOutput(output,false,false);
if(header) output << "\n\" where BINARY ThePEGName=\""
<< fullName() << "\";" << endl;
}
Complex TwoKaonCzyzCurrent::Fkaon(Energy2 q2,const int imode, const int ichan,
IsoSpin::IsoSpin Itotal, Strangeness::Strange strange,
tcPDPtr resonance, Energy ma, Energy mb) const {
unsigned int imin=0, imax = 4;
bool on[3] = {(Itotal==IsoSpin::IUnknown || Itotal==IsoSpin::IOne),
(Itotal==IsoSpin::IUnknown || Itotal==IsoSpin::IZero) && imode!=0,
(Itotal==IsoSpin::IUnknown || Itotal==IsoSpin::IZero) && imode!=0};
if(strange!=Strangeness::Unknown) {
if(strange==Strangeness::Zero) on[2] = false;
else if(strange==Strangeness::ssbar) on[0]=on[1]=false;
}
if(ichan>=0) {
if(ichan<3) {
on[1]=on[2]=false;
imin = ichan;
imax = ichan+1;
}
else if(ichan==3) {
on[0]=on[2]=false;
imin=0;
imax=1;
}
else if(ichan==4) {
on[0]=on[1]=false;
imin=0;
imax=1;
}
else
assert(false);
}
if(resonance) {
switch(resonance->id()%1000) {
case 223:
imin=0;
on[0]=on[2]=false;
break;
case 333:
imin=0;
on[0]=on[1]=false;
break;
case 113:
switch(resonance->id()/1000) {
case 0:
imin=0;
break;
case 100:
imin = 1;
break;
case 30 :
imin = 2;
break;
default :
assert(false);
}
on[1]=on[2]=false;
break;
default:
assert(false);
}
imax = imin+1;
}
// calculate the form factor
Complex FK(0.);
for(unsigned int ix=imin;ix<imax;++ix) {
// rho exchange
if(on[0]) {
Complex term = coup_[0][ix]*Resonance::BreitWignerGS(q2,mass_[0][ix],width_[0][ix],
mpi_,mpi_,h0_[ix],dh_[ix],hres_[ix]);
FK += imode!=1 ? 0.5*term : -0.5*term;
}
// omega exchange
if(on[1]) {
Complex term = coup_[1][ix]*Resonance::BreitWignerFW(q2,mass_[1][ix],width_[1][ix]);
FK += 1./6.*term;
}
// phi exchange
if(on[2]) {
Complex term = coup_[2][ix]*Resonance::BreitWignerPWave(q2,mass_[2][ix],width_[2][ix],ma,mb);
if(ix==0 && imode==1 ) term *=etaPhi_;
FK += term/3.;
}
}
// remainder pieces
if(imax==4) {
if(!fKI1Re_) constructInterpolators();
Complex i1((*fKI1Re_)(q2),(*fKI1Im_)(q2));
FK += imode!=1 ? i1 : -i1;
FK += Complex((*fKI0Re_)(q2),(*fKI0Im_)(q2));
}
// factor for cc mode
if(imode==0) FK *= sqrt(2.0);
return FK;
}
Complex TwoKaonCzyzCurrent::FkaonRemainderI1(Energy2 q2) const {
Complex output(0.);
for(unsigned int ix=4;ix<coup_[0].size();++ix)
output += 0.5*coup_[0][ix]*Resonance::BreitWignerGS(q2,mass_[0][ix],width_[0][ix],
mpi_,mpi_,h0_[ix],dh_[ix],hres_[ix]);
return output;
}
Complex TwoKaonCzyzCurrent::FkaonRemainderI0(Energy2 q2,Energy ma, Energy mb) const {
Complex output(0.);
// omega exchange
for(unsigned int ix=4;ix<coup_[1].size();++ix)
output += 1./6.*coup_[1][ix]*Resonance::BreitWignerFW(q2,mass_[1][ix],width_[1][ix]);
// phi exchange
for(unsigned int ix=4;ix<coup_[2].size();++ix)
output += 1./3.*coup_[2][ix]*Resonance::BreitWignerPWave(q2,mass_[2][ix],width_[2][ix],ma,mb);
return output;
}
diff --git a/Decay/WeakCurrents/TwoPionCzyzCurrent.cc b/Decay/WeakCurrents/TwoPionCzyzCurrent.cc
--- a/Decay/WeakCurrents/TwoPionCzyzCurrent.cc
+++ b/Decay/WeakCurrents/TwoPionCzyzCurrent.cc
@@ -1,478 +1,479 @@
// -*- C++ -*-
//
// This is the implementation of the non-inlined, non-templated member
// functions of the TwoPionCzyzCurrent class.
//
#include "TwoPionCzyzCurrent.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/EventRecord/Particle.h"
#include "ThePEG/Repository/UseRandom.h"
#include "ThePEG/Repository/EventGenerator.h"
#include "ThePEG/Utilities/DescribeClass.h"
#include "Herwig/Decay/ResonanceHelpers.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
using namespace Herwig;
HERWIG_INTERPOLATOR_CLASSDESC(TwoPionCzyzCurrent,double,Energy2)
TwoPionCzyzCurrent::TwoPionCzyzCurrent()
: omegaMag_(18.7e-4), omegaPhase_(0.106),
omegaMass_(782.4*MeV),omegaWidth_(8.33*MeV), beta_(2.148),
- nMax_(2000), eMax_(10.*GeV) {
+ nMax_(2000), eMax_(-GeV) {
// various parameters
rhoMag_ = {1.,1.,0.59,0.048,0.40,0.43};
rhoPhase_ = {0.,0.,-2.20,-2.0,-2.9,1.19};
rhoMasses_ = {773.37*MeV,1490*MeV, 1870*MeV,2120*MeV,2321*MeV,2567*MeV};
rhoWidths_ = { 147.1*MeV, 429*MeV, 357*MeV, 300*MeV, 444*MeV, 491*MeV};
// set up for the modes in the base class
addDecayMode(2,-1);
addDecayMode(1,-1);
addDecayMode(2,-2);
setInitialModes(3);
}
IBPtr TwoPionCzyzCurrent::clone() const {
return new_ptr(*this);
}
IBPtr TwoPionCzyzCurrent::fullclone() const {
return new_ptr(*this);
}
void TwoPionCzyzCurrent::persistentOutput(PersistentOStream & os) const {
os << beta_ << omegaWgt_ << omegaMag_ << omegaPhase_
<< ounit(omegaMass_,GeV) << ounit(omegaWidth_,GeV)
<< rhoWgt_ << rhoMag_ << rhoPhase_
<< ounit(rhoMasses_,GeV) << ounit(rhoWidths_,GeV)
<< ounit(mass_,GeV) << ounit(width_,GeV) << coup_
<< dh_ << ounit(hres_,GeV2) << ounit(h0_,GeV2) << nMax_
<< ounit(eMax_,GeV) << fpiRe_ << fpiIm_;
}
void TwoPionCzyzCurrent::persistentInput(PersistentIStream & is, int) {
is >> beta_ >> omegaWgt_ >> omegaMag_ >> omegaPhase_
>> iunit(omegaMass_,GeV) >> iunit(omegaWidth_,GeV)
>> rhoWgt_ >> rhoMag_ >> rhoPhase_
>> iunit(rhoMasses_,GeV) >> iunit(rhoWidths_,GeV)
>> iunit(mass_,GeV) >> iunit(width_,GeV) >> coup_
>> dh_ >> iunit(hres_,GeV2) >> iunit(h0_,GeV2) >> nMax_
>> iunit(eMax_,GeV) >> fpiRe_ >> fpiIm_;
}
// The following static variable is needed for the type
// description system in ThePEG.
DescribeClass<TwoPionCzyzCurrent,WeakCurrent>
describeHerwigTwoPionCzyzCurrent("Herwig::TwoPionCzyzCurrent", "HwWeakCurrents.so");
void TwoPionCzyzCurrent::Init() {
static ClassDocumentation<TwoPionCzyzCurrent> documentation
("The TwoPionCzyzCurrent class uses the currents from "
"PRD 81 094014 for the weak current with two pions",
"The current for two pions from \\cite{Czyz:2010hj} was used.",
"%\\cite{Czyz:2010hj}\n"
"\\bibitem{Czyz:2010hj}\n"
"H.~Czyz, A.~Grzelinska and J.~H.~Kuhn,\n"
"%``Narrow resonances studies with the radiative return method,''\n"
"Phys.\\ Rev.\\ D {\\bf 81} (2010) 094014\n"
"doi:10.1103/PhysRevD.81.094014\n"
"[arXiv:1002.0279 [hep-ph]].\n"
"%%CITATION = doi:10.1103/PhysRevD.81.094014;%%\n"
"%28 citations counted in INSPIRE as of 30 Jul 2018\n");
static ParVector<TwoPionCzyzCurrent,Energy> interfaceRhoMasses
("RhoMasses",
"The masses of the different rho resonances for the pi pi channel",
&TwoPionCzyzCurrent::rhoMasses_, MeV, -1, 775.8*MeV, ZERO, 10000.*MeV,
false, false, true);
static ParVector<TwoPionCzyzCurrent,Energy> interfaceRhoWidths
("RhoWidths",
"The widths of the different rho resonances for the pi pi channel",
&TwoPionCzyzCurrent::rhoWidths_, MeV, -1, 150.3*MeV, ZERO, 1000.*MeV,
false, false, true);
static ParVector<TwoPionCzyzCurrent,double> interfaceRhoMagnitude
("RhoMagnitude",
"Magnitude of the weight of the different resonances for the pi pi channel",
&TwoPionCzyzCurrent::rhoMag_, -1, 0., 0, 0,
false, false, Interface::nolimits);
static ParVector<TwoPionCzyzCurrent,double> interfaceRhoPhase
("RhoPhase",
"Phase of the weight of the different resonances for the pi pi channel",
&TwoPionCzyzCurrent::rhoPhase_, -1, 0., 0, 0,
false, false, Interface::nolimits);
static Parameter<TwoPionCzyzCurrent,unsigned int> interfacenMax
("nMax",
"The maximum number of resonances to include in the sum,"
" should be approx infinity",
&TwoPionCzyzCurrent::nMax_, 1000, 10, 10000,
false, false, Interface::limited);
static Parameter<TwoPionCzyzCurrent,double> interfacebeta
("beta",
"The beta parameter for the couplings",
&TwoPionCzyzCurrent::beta_, 2.148, 0.0, 100.,
false, false, Interface::limited);
static Parameter<TwoPionCzyzCurrent,Energy> interfaceOmegaMass
("OmegaMass",
"The mass of the omega meson",
&TwoPionCzyzCurrent::omegaMass_, MeV,782.4*MeV, 0.0*MeV, 1000.0*MeV,
false, false, Interface::limited);
static Parameter<TwoPionCzyzCurrent,Energy> interfaceOmegaWidth
("OmegaWidth",
"The mass of the omega meson",
&TwoPionCzyzCurrent::omegaWidth_, MeV, 8.33*MeV, 0.0*MeV, 500.0*MeV,
false, false, Interface::limited);
static Parameter<TwoPionCzyzCurrent,double> interfaceOmegaMagnitude
("OmegaMagnitude",
"The magnitude of the omega couplings",
&TwoPionCzyzCurrent::omegaMag_, 18.7e-4, 0.0, 10.0,
false, false, Interface::limited);
static Parameter<TwoPionCzyzCurrent,double> interfaceOmegaPhase
("OmegaPhase",
"The magnitude of the omega couplings",
&TwoPionCzyzCurrent::omegaPhase_, 0.106, 0.0, 2.*Constants::pi,
false, false, Interface::limited);
}
void TwoPionCzyzCurrent::doinit() {
WeakCurrent::doinit();
// check consistency of parametrers
if(rhoMasses_.size()!=rhoWidths_.size())
throw InitException() << "Inconsistent parameters in TwoPionCzyzCurrent"
<< "::doinit()" << Exception::abortnow;
// weights for the rho channels
if(rhoMag_.size()!=rhoPhase_.size())
throw InitException() << "The vectors containing the weights and phase for the"
<< " rho channel must be the same size in "
<< "TwoPionCzyzCurrent::doinit()" << Exception::runerror;
Complex rhoSum(0.);
for(unsigned int ix=0;ix<rhoMag_.size();++ix) {
rhoWgt_.push_back(rhoMag_[ix]*(cos(rhoPhase_[ix])+Complex(0.,1.)*sin(rhoPhase_[ix])));
if(ix>0) rhoSum +=rhoWgt_.back();
}
omegaWgt_ = omegaMag_*(cos(omegaPhase_)+Complex(0.,1.)*sin(omegaPhase_));
// set up the masses and widths of the rho resonances
double gamB(tgamma(2.-beta_));
Complex cwgt(0.);
Energy mpi(getParticleData(ParticleID::piplus)->mass());
for(unsigned int ix=0;ix<nMax_;++ix) {
// this is gam(2-beta+n)/gam(n+1)
if(ix>0) {
gamB *= ((1.-beta_+double(ix)))/double(ix);
}
Complex c_n = tgamma(beta_-0.5) /(0.5+double(ix)) / sqrt(Constants::pi) *
sin(Constants::pi*(beta_-1.-double(ix)))/Constants::pi*gamB;
if(ix%2!=0) c_n *= -1.;
// set the masses and widths
// calc for higher resonances
if(ix>=rhoMasses_.size()) {
mass_ .push_back(rhoMasses_[0]*sqrt(1.+2.*double(ix)));
width_.push_back(rhoWidths_[0]/rhoMasses_[0]*mass_.back());
}
// input for lower ones
else {
mass_ .push_back(rhoMasses_[ix]);
width_.push_back(rhoWidths_[ix]);
if(ix>0) cwgt += c_n;
}
// parameters for the gs propagators
hres_.push_back(Resonance::Hhat(sqr(mass_.back()),mass_.back(),width_.back(),mpi,mpi));
dh_ .push_back(Resonance::dHhatds(mass_.back(),width_.back(),mpi,mpi));
h0_.push_back(Resonance::H(ZERO,mass_.back(),width_.back(),mpi,mpi,dh_.back(),hres_.back()));
coup_.push_back(c_n);
}
// fix up the early weights
for(unsigned int ix=1;ix<rhoMasses_.size();++ix) {
coup_[ix] = rhoWgt_[ix]*cwgt/rhoSum;
}
}
void TwoPionCzyzCurrent::constructInterpolators() const {
// construct the interpolators
Energy mpi(getParticleData(ParticleID::piplus)->mass());
vector<Energy2> en;
vector<double> re,im;
- Energy step = (eMax_-2.*mpi)/nMax_;
+ Energy maxE = eMax_>ZERO ? eMax_ : 10.*GeV;
+ Energy step = (maxE-2.*mpi)/nMax_;
Energy Q = 2.*mpi;
for(unsigned int ix=0;ix<nMax_+1;++ix) {
Complex value = FpiRemainder(sqr(Q),mpi,mpi);
en.push_back(sqr(Q));
re.push_back(value.real());
im.push_back(value.imag());
Q+=step;
}
fpiRe_ = make_InterpolatorPtr(re,en,3);
fpiIm_ = make_InterpolatorPtr(im,en,3);
}
// complete the construction of the decay mode for integration
bool TwoPionCzyzCurrent::createMode(int icharge, tcPDPtr resonance,
FlavourInfo flavour,
unsigned int imode,PhaseSpaceModePtr mode,
unsigned int iloc,int ires,
PhaseSpaceChannel phase, Energy upp ) {
// check the charge
if((imode==0 && abs(icharge)!=3) ||
(imode>0 && icharge !=0)) return false;
// check the total isospin
if(flavour.I!=IsoSpin::IUnknown) {
if(flavour.I!=IsoSpin::IOne) return false;
}
// check I_3
if(flavour.I3!=IsoSpin::I3Unknown) {
switch(flavour.I3) {
case IsoSpin::I3Zero:
if(imode==0) return false;
break;
case IsoSpin::I3One:
if(imode==1 || icharge ==-3) return false;
break;
case IsoSpin::I3MinusOne:
if(imode==1 || icharge ==3) return false;
break;
default:
return false;
}
}
if(flavour.strange != Strangeness::Unknown and flavour.strange != Strangeness::Zero ) return false;
if(flavour.charm != Charm::Unknown and flavour.charm != Charm::Zero ) return false;
if(flavour.bottom != Beauty::Unknown and flavour.bottom !=Beauty::Zero ) return false;
// make sure that the decays are kinematically allowed
tPDPtr part[2];
if(imode==0) {
part[0]=getParticleData(ParticleID::piplus);
part[1]=getParticleData(ParticleID::pi0);
}
else {
part[0]=getParticleData(ParticleID::piplus);
part[1]=getParticleData(ParticleID::piminus);
}
Energy min(part[0]->massMin()+part[1]->massMin());
if(min>upp) return false;
- eMax_=upp;
+ eMax_=max(upp,eMax_);
// set up the resonances
tPDPtr res[3];
if(icharge==0) {
res[0] =getParticleData(113);
res[1] =getParticleData(100113);
res[2] =getParticleData(30113);
}
else {
res[0] =getParticleData(213);
res[1] =getParticleData(100213);
res[2] =getParticleData(30213);
if(icharge==-3) {
for(unsigned int ix=0;ix<3;++ix) {
if(res[ix]&&res[ix]->CC()) res[ix]=res[ix]->CC();
}
}
}
// create the channels
for(unsigned int ix=0;ix<3;++ix) {
if(!res[ix]) continue;
if(resonance && resonance != res[ix]) continue;
mode->addChannel((PhaseSpaceChannel(phase),ires,res[ix],ires+1,iloc+1,ires+1,iloc+2));
}
// reset the masses in the intergrators
for(unsigned int ix=0;ix<3;++ix) {
if(ix<rhoMasses_.size()&&res[ix]) {
mode->resetIntermediate(res[ix],rhoMasses_[ix],rhoWidths_[ix]);
}
}
return true;
}
// the particles produced by the current
tPDVector TwoPionCzyzCurrent::particles(int icharge, unsigned int imode,
int,int) {
tPDVector output(2);
if(imode==0) {
output[0]=getParticleData(ParticleID::piplus);
output[1]=getParticleData(ParticleID::pi0);
if(icharge==-3) {
for(unsigned int ix=0;ix<output.size();++ix) {
if(output[ix]->CC()) output[ix]=output[ix]->CC();
}
}
}
else {
output[0]=getParticleData(ParticleID::piplus);
output[1]=getParticleData(ParticleID::piminus);
}
return output;
}
// hadronic current
vector<LorentzPolarizationVectorE>
TwoPionCzyzCurrent::current(tcPDPtr resonance,
FlavourInfo flavour,
const int imode, const int ichan,Energy & scale,
const tPDVector & outgoing,
const vector<Lorentz5Momentum> & momenta,
DecayIntegrator::MEOption) const {
useMe();
// check the isospin
if(flavour.I!=IsoSpin::IUnknown && flavour.I!=IsoSpin::IOne)
return vector<LorentzPolarizationVectorE>();
int icharge = outgoing[0]->iCharge()+outgoing[1]->iCharge();
// check I_3
if(flavour.I3!=IsoSpin::I3Unknown) {
switch(flavour.I3) {
case IsoSpin::I3Zero:
if(imode==0) return vector<LorentzPolarizationVectorE>();
break;
case IsoSpin::I3One:
if(imode==1 || icharge ==-3) return vector<LorentzPolarizationVectorE>();
break;
case IsoSpin::I3MinusOne:
if(imode==1 || icharge ==3) return vector<LorentzPolarizationVectorE>();
break;
default:
return vector<LorentzPolarizationVectorE>();
}
}
if(flavour.strange != Strangeness::Unknown and flavour.strange != Strangeness::Zero)
return vector<LorentzPolarizationVectorE>();
if(flavour.charm != Charm::Unknown and flavour.charm != Charm::Zero )
return vector<LorentzPolarizationVectorE>();
if(flavour.bottom != Beauty::Unknown and flavour.bottom !=Beauty::Zero )
return vector<LorentzPolarizationVectorE>();
// momentum difference and sum of the mesons
Lorentz5Momentum pdiff(momenta[0]-momenta[1]);
Lorentz5Momentum psum (momenta[0]+momenta[1]);
psum.rescaleMass();
scale=psum.mass();
// mass2 of vector intermediate state
Energy2 q2(psum.m2());
double dot(psum*pdiff/q2);
psum *=dot;
// compute the form factor
Complex FPI=Fpi(q2,imode,ichan,resonance,momenta[0].mass(),momenta[1].mass());
// calculate the current
pdiff -= psum;
return vector<LorentzPolarizationVectorE>(1,FPI*pdiff);
}
bool TwoPionCzyzCurrent::accept(vector<int> id) {
// check there are only two particles
if(id.size()!=2) return false;
// pion modes
if((abs(id[0])==ParticleID::piplus && id[1] ==ParticleID::pi0 ) ||
( id[0] ==ParticleID::pi0 && abs(id[1])==ParticleID::piplus))
return true;
else if((id[0]==ParticleID::piminus && id[1]==ParticleID::piplus) ||
(id[0]==ParticleID::piplus && id[1]==ParticleID::piminus))
return true;
else
return false;
}
// the decay mode
unsigned int TwoPionCzyzCurrent::decayMode(vector<int> idout) {
unsigned int npi(0);
for(unsigned int ix=0;ix<idout.size();++ix) {
if(abs(idout[ix])==ParticleID::piplus) ++npi;
}
if(npi==2) return 1;
else return 0;
}
// output the information for the database
void TwoPionCzyzCurrent::dataBaseOutput(ofstream & output,bool header,
bool create) const {
if(header) output << "update decayers set parameters=\"";
if(create) output << "create Herwig::TwoPionCzyzCurrent "
<< name() << " HwWeakCurrents.so\n";
unsigned int ix;
for(ix=0;ix<rhoMasses_.size();++ix) {
if(ix<6) output << "newdef ";
else output << "insert ";
output << name() << ":RhoMasses " << ix << " " << rhoMasses_[ix]/MeV << "\n";
}
for(ix=0;ix<rhoWidths_.size();++ix) {
if(ix<6) output << "newdef ";
else output << "insert ";
output << name() << ":RhoWidths " << ix << " " << rhoWidths_[ix]/MeV << "\n";
}
for(ix=0;ix<rhoWgt_.size();++ix) {
if(ix<6) output << "newdef ";
else output << "insert ";
output << name() << ":RhoMagnitude " << ix << " " << rhoMag_[ix] << "\n";
if(ix<6) output << "newdef ";
else output << "insert ";
output << name() << ":RhoPhase " << ix << " " << rhoPhase_[ix] << "\n";
}
output << "newdef " << name() << ":OmegaMass " << omegaMass_/MeV << "\n";
output << "newdef " << name() << ":OmegaWidth " << omegaWidth_/MeV << "\n";
output << "newdef " << name() << ":OmegaMagnitude " << omegaMag_ << "\n";
output << "newdef " << name() << ":OmegaPhase " << omegaPhase_ << "\n";
output << "newdef " << name() << ":nMax " << nMax_ << "\n";
output << "newdef " << name() << ":beta " << beta_ << "\n";
WeakCurrent::dataBaseOutput(output,false,false);
if(header) output << "\n\" where BINARY ThePEGName=\""
<< fullName() << "\";" << endl;
}
Complex TwoPionCzyzCurrent::Fpi(Energy2 q2,const int imode, const int ichan,
tcPDPtr resonance, Energy ma, Energy mb) const {
Complex FPI(0.);
unsigned int imin=0, imax = 4;
if(ichan>0) {
imin = ichan;
imax = ichan+1;
}
if(resonance) {
switch(resonance->id()/1000) {
case 0:
imax = 1;
break;
case 100:
imin = 1;
imax = 2;
break;
case 30 :
imin = 2;
imax = 3;
break;
default:
assert(false);
}
}
for(unsigned int ix=imin;ix<imax;++ix) {
Complex term = coup_[ix]*Resonance::BreitWignerGS(q2,mass_[ix],width_[ix],
ma,mb,h0_[ix],dh_[ix],hres_[ix]);
// include rho-omega if needed
if(ix==0&&imode!=0)
term *= 1./(1.+omegaWgt_)*(1.+omegaWgt_*Resonance::BreitWignerFW(q2,omegaMass_,omegaWidth_));
FPI += term;
}
// interpolator for the higher resonances
if(imax==4) {
if(!fpiRe_) constructInterpolators();
FPI += Complex((*fpiRe_)(q2),(*fpiIm_)(q2));
}
// factor for cc mode
if(imode==0) FPI *= sqrt(2.0);
return FPI;
}
Complex TwoPionCzyzCurrent::FpiRemainder(Energy2 q2, Energy ma, Energy mb) const {
Complex output(0.);
for(unsigned int ix=4;ix<coup_.size();++ix) {
output += coup_[ix]*Resonance::BreitWignerGS(q2,mass_[ix],width_[ix],
ma,mb,h0_[ix],dh_[ix],hres_[ix]);
}
return output;
}

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