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diff --git a/Models/General/TwoToTwoProcessConstructor.cc b/Models/General/TwoToTwoProcessConstructor.cc
--- a/Models/General/TwoToTwoProcessConstructor.cc
+++ b/Models/General/TwoToTwoProcessConstructor.cc
@@ -1,643 +1,643 @@
// -*- C++ -*-
//
// TwoToTwoProcessConstructor.cc 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.
//
//
// This is the implementation of the non-inlined, non-templated member
// functions of the TwoToTwoProcessConstructor class.
//
#include "TwoToTwoProcessConstructor.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include "ThePEG/Interface/RefVector.h"
#include "ThePEG/Interface/Reference.h"
#include "ThePEG/Interface/Parameter.h"
#include "ThePEG/Interface/Switch.h"
using namespace Herwig;
namespace {
// Helper functor for find_if in duplicate function.
class SameIncomingAs {
public:
SameIncomingAs(tPDPair in) : a(in.first->id()), b(in.second->id()) {}
bool operator()(tPDPair ppair) const {
long id1(ppair.first->id()), id2(ppair.second->id());
return ( id1 == a && id2 == b ) || ( id1 == b && id2 == a );
}
private:
long a, b;
};
bool duplicateIncoming(tPDPair ppair, const vector<tPDPair> & incPairs ) {
vector<tPDPair>::const_iterator it =
find_if( incPairs.begin(), incPairs.end(), SameIncomingAs(ppair) );
return it != incPairs.end();
}
}
TwoToTwoProcessConstructor::TwoToTwoProcessConstructor() :
Nout_(0), nv_(0), allDiagrams_(true),
processOption_(0), scaleChoice_(0), scaleFactor_(1.)
{}
IBPtr TwoToTwoProcessConstructor::clone() const {
return new_ptr(*this);
}
IBPtr TwoToTwoProcessConstructor::fullclone() const {
return new_ptr(*this);
}
void TwoToTwoProcessConstructor::doinit() {
HardProcessConstructor::doinit();
if(processOption_==2&&outgoing_.size()!=2)
throw InitException()
<< "Exclusive processes require exactly"
<< " two outgoing particles but " << outgoing_.size()
<< "have been inserted in TwoToTwoProcessConstructor::doinit()."
<< Exception::runerror;
Nout_ = outgoing_.size();
PDVector::size_type ninc = incoming_.size();
// exit if nothing to do
if(Nout_==0||ninc==0) return;
//create vector of initial-state pairs
for(PDVector::size_type i = 0; i < ninc; ++i) {
for(PDVector::size_type j = 0; j < ninc; ++j) {
tPDPair inc = make_pair(incoming_[i], incoming_[j]);
if( (inc.first->iSpin() > inc.second->iSpin()) ||
(inc.first->iSpin() == inc.second->iSpin() &&
inc.first->id() < inc.second->id()) )
swap(inc.first, inc.second);
if( !duplicateIncoming(inc,incPairs_) ) {
incPairs_.push_back(inc);
}
}
}
// excluded vertices
excludedVertexSet_ =
set<VertexBasePtr>(excludedVertexVector_.begin(),
excludedVertexVector_.end());
}
void TwoToTwoProcessConstructor::persistentOutput(PersistentOStream & os) const {
os << vertices_ << incoming_ << outgoing_
<< allDiagrams_ << processOption_
<< scaleChoice_ << scaleFactor_ << excluded_ << excludedExternal_
<< excludedVertexVector_ << excludedVertexSet_;
}
void TwoToTwoProcessConstructor::persistentInput(PersistentIStream & is, int) {
is >> vertices_ >> incoming_ >> outgoing_
>> allDiagrams_ >> processOption_
>> scaleChoice_ >> scaleFactor_ >> excluded_ >> excludedExternal_
>> excludedVertexVector_ >> excludedVertexSet_;
}
ClassDescription<TwoToTwoProcessConstructor>
TwoToTwoProcessConstructor::initTwoToTwoProcessConstructor;
// Definition of the static class description member.
void TwoToTwoProcessConstructor::Init() {
static ClassDocumentation<TwoToTwoProcessConstructor> documentation
("TwoToTwoProcessConstructor constructs the possible diagrams for "
"a process given the external particles");
static RefVector<TwoToTwoProcessConstructor,ThePEG::ParticleData> interfaceIn
("Incoming",
"Pointers to incoming particles",
&TwoToTwoProcessConstructor::incoming_, -1, false, false, true, false);
static RefVector<TwoToTwoProcessConstructor,ThePEG::ParticleData> interfaceOut
("Outgoing",
"Pointers to incoming particles",
&TwoToTwoProcessConstructor::outgoing_, -1, false, false, true, false);
static Switch<TwoToTwoProcessConstructor,bool> interfaceIncludeAllDiagrams
("IncludeEW",
"Switch to decide which diagrams to include in ME calc.",
&TwoToTwoProcessConstructor::allDiagrams_, true, false, false);
static SwitchOption interfaceIncludeAllDiagramsOff
(interfaceIncludeAllDiagrams,
"No",
"Only include QCD diagrams",
false);
static SwitchOption interfaceIncludeAllDiagramsOn
(interfaceIncludeAllDiagrams,
"Yes",
"Include EW+QCD.",
true);
static Switch<TwoToTwoProcessConstructor,unsigned int> interfaceProcesses
("Processes",
"Whether to generate inclusive or exclusive processes",
&TwoToTwoProcessConstructor::processOption_, 0, false, false);
static SwitchOption interfaceProcessesSingleParticleInclusive
(interfaceProcesses,
"SingleParticleInclusive",
"Require at least one particle from the list of outgoing particles"
" in the hard process",
0);
static SwitchOption interfaceProcessesTwoParticleInclusive
(interfaceProcesses,
"TwoParticleInclusive",
"Require that both the particles in the hard processes are in the"
" list of outgoing particles",
1);
static SwitchOption interfaceProcessesExclusive
(interfaceProcesses,
"Exclusive",
"Require that both the particles in the hard processes are in the"
" list of outgoing particles in every hard process",
2);
static Switch<TwoToTwoProcessConstructor,unsigned int> interfaceScaleChoice
("ScaleChoice",
"&TwoToTwoProcessConstructor::scaleChoice_",
&TwoToTwoProcessConstructor::scaleChoice_, 0, false, false);
static SwitchOption interfaceScaleChoiceDefault
(interfaceScaleChoice,
"Default",
"Use if sHat if intermediates all colour neutral, otherwise the transverse mass",
0);
static SwitchOption interfaceScaleChoicesHat
(interfaceScaleChoice,
"sHat",
"Always use sHat",
1);
static SwitchOption interfaceScaleChoiceTransverseMass
(interfaceScaleChoice,
"TransverseMass",
"Always use the transverse mass",
2);
static Parameter<TwoToTwoProcessConstructor,double> interfaceScaleFactor
("ScaleFactor",
"The prefactor used in the scale calculation. The scale used is"
" that defined by scaleChoice multiplied by this prefactor",
&TwoToTwoProcessConstructor::scaleFactor_, 1.0, 0.0, 10.0,
false, false, Interface::limited);
static RefVector<TwoToTwoProcessConstructor,ThePEG::ParticleData> interfaceExcluded
("Excluded",
"Particles which are not allowed as intermediates",
&TwoToTwoProcessConstructor::excluded_, -1, false, false, true, false, false);
static RefVector<TwoToTwoProcessConstructor,ParticleData> interfaceExcludedExternal
("ExcludedExternal",
"Particles which are not allowed as outgoing particles",
&TwoToTwoProcessConstructor::excludedExternal_, -1,
false, false, true, false, false);
static RefVector<TwoToTwoProcessConstructor,VertexBase> interfaceExcludedVertices
("ExcludedVertices",
"Vertices which are not included in the 2 -> 2 scatterings",
&TwoToTwoProcessConstructor::excludedVertexVector_, -1, false, false, true, true, false);
}
namespace {
// Helper functor for find_if below.
class SameProcessAs {
public:
SameProcessAs(const HPDiagram & diag) : a(diag) {}
bool operator()(const HPDiagram & b) const {
return a.sameProcess(b);
}
private:
HPDiagram a;
};
}
void TwoToTwoProcessConstructor::constructDiagrams() {
if(incPairs_.empty() || outgoing_.empty()) return;
nv_ = model()->numberOfVertices();
//make sure vertices are initialised
for(unsigned int ix = 0; ix < nv_; ++ix ) {
VertexBasePtr vertex = model()->vertex(ix);
if(excludedVertexSet_.find(vertex) !=
excludedVertexSet_.end()) continue;
vertices_.push_back(vertex);
}
nv_ = vertices_.size();
//Create necessary diagrams
vector<tcPDPair>::size_type is;
PDVector::size_type os;
for(is = 0; is < incPairs_.size(); ++is) {
tPDPair ppi = incPairs_[is];
for(os = 0; os < Nout_; ++os) {
long fs = outgoing_[os]->id();
for(size_t iv = 0; iv < nv_; ++iv) {
tVertexBasePtr vertexA = vertices_[iv];
//This skips an effective vertex and the EW ones if
// we only want the strong diagrams
if( !allDiagrams_ && vertexA->orderInGs() == 0 )
continue;
if(vertexA->getNpoint() == 3) {
//scattering diagrams
createTChannels(ppi, fs, vertexA);
//resonance diagrams
if( vertexA->isIncoming(ppi.first) &&
vertexA->isIncoming(ppi.second) )
createSChannels(ppi, fs, vertexA);
}
else
makeFourPointDiagrams(ppi.first->id(), ppi.second->id(),
fs, vertexA);
}
}
}
//need to find all of the diagrams that relate to the same process
//first insert them into a map which uses the '<' operator
//to sort the diagrams
multiset<HPDiagram> grouped;
HPDVector::iterator dit = processes_.begin();
HPDVector::iterator dend = processes_.end();
bool abort=false;
for( ; dit != dend; ++dit) {
// check for on-shell s-channel
tPDPtr out1 = getParticleData(dit->outgoing.first );
tPDPtr out2 = getParticleData(dit->outgoing.second);
if(dit->channelType == HPDiagram::sChannel &&
dit->intermediate->width()==ZERO &&
dit->intermediate->mass() > out1->mass()+ out2->mass()) {
tPDPtr in1 = getParticleData(dit->incoming.first );
tPDPtr in2 = getParticleData(dit->incoming.second);
generator()->log() << dit->intermediate->PDGName()
<< " can be on-shell in the process "
<< in1 ->PDGName() << " " << in2->PDGName() << " -> "
<< out1->PDGName() << " " << out2->PDGName()
<< " but has zero width.\nEither set the width, enable "
<< "calculation of its decays, and hence the width,\n"
<< "or disable it as a potential intermediate using\n"
<< "insert " << fullName() << ":Excluded 0 "
<< dit->intermediate->fullName() << "\n---\n";
abort = true;
}
grouped.insert(*dit);
}
if(abort) throw Exception() << "One or more processes with zero width"
<< " resonant intermediates"
<< Exception::runerror;
assert( processes_.size() == grouped.size() );
processes_.clear();
typedef multiset<HPDiagram>::const_iterator set_iter;
set_iter it = grouped.begin(), iend = grouped.end();
while( it != iend ) {
pair<set_iter,set_iter> range = grouped.equal_range(*it);
set_iter itb = range.first;
HPDVector process;
for( ; itb != range.second; ++itb ) {
process.push_back(*itb);
}
// if inclusive enforce the exclusivity
if(processOption_==2) {
if(!((process[0].outgoing. first==outgoing_[0]->id()&&
process[0].outgoing.second==outgoing_[1]->id())||
(process[0].outgoing. first==outgoing_[1]->id()&&
process[0].outgoing.second==outgoing_[0]->id()))) {
process.clear();
it = range.second;
continue;
}
}
if(find(excludedExternal_.begin(),excludedExternal_.end(),
getParticleData(process[0].outgoing. first))!=excludedExternal_.end()) {
process.clear();
it = range.second;
continue;
}
if(find(excludedExternal_.begin(),excludedExternal_.end(),
getParticleData(process[0].outgoing.second))!=excludedExternal_.end()) {
process.clear();
it = range.second;
continue;
}
createMatrixElement(process);
process.clear();
it = range.second;
}
}
void TwoToTwoProcessConstructor::
createSChannels(tcPDPair inpp, long fs, tVertexBasePtr vertex) {
//Have 2 incoming particle and a vertex, find the possible offshell
//particles
pair<long,long> inc = make_pair(inpp.first->id(), inpp.second->id());
tPDSet offshells = search(vertex, inpp.first->id(), incoming,
inpp.second->id(), incoming, outgoing);
tPDSet::const_iterator it;
for(it = offshells.begin(); it != offshells.end(); ++it) {
if(find(excluded_.begin(),excluded_.end(),*it)!=excluded_.end()) continue;
for(size_t iv = 0; iv < nv_; ++iv) {
tVertexBasePtr vertexB = vertices_[iv];
if( vertexB->getNpoint() != 3) continue;
if( !allDiagrams_ && vertexB->orderInGs() == 0 ) continue;
tPDSet final;
if( vertexB->isOutgoing(getParticleData(fs)) &&
vertexB->isIncoming(*it) )
final = search(vertexB, (*it)->id(), incoming, fs,
outgoing, outgoing);
//Now make diagrams
if(!final.empty())
makeDiagrams(inc, fs, final, *it, HPDiagram::sChannel,
make_pair(vertex, vertexB), make_pair(true,true));
}
}
}
void TwoToTwoProcessConstructor::
createTChannels(tPDPair inpp, long fs, tVertexBasePtr vertex) {
pair<long,long> inc = make_pair(inpp.first->id(), inpp.second->id());
//first try a with c
tPDSet offshells = search(vertex, inpp.first->id(), incoming, fs,
outgoing, outgoing);
tPDSet::const_iterator it;
for(it = offshells.begin(); it != offshells.end(); ++it) {
if(find(excluded_.begin(),excluded_.end(),*it)!=excluded_.end()) continue;
for(size_t iv = 0; iv < nv_; ++iv) {
tVertexBasePtr vertexB = vertices_[iv];
if( vertexB->getNpoint() != 3 ) continue;
if( !allDiagrams_ && vertexB->orderInGs() == 0 ) continue;
tPDSet final;
if( vertexB->isIncoming(inpp.second) )
final = search(vertexB, inc.second, incoming, (*it)->id(),
incoming, outgoing);
if( !final.empty() )
makeDiagrams(inc, fs, final, *it, HPDiagram::tChannel,
make_pair(vertex, vertexB), make_pair(true,true));
}
}
//now try b with c
offshells = search(vertex, inpp.second->id(), incoming, fs,
outgoing, incoming);
for(it = offshells.begin(); it != offshells.end(); ++it) {
if(find(excluded_.begin(),excluded_.end(),*it)!=excluded_.end()) continue;
for(size_t iv = 0; iv < nv_; ++iv) {
tVertexBasePtr vertexB = vertices_[iv];
if( vertexB->getNpoint() != 3 ) continue;
if( !allDiagrams_ && vertexB->orderInGs() == 0 ) continue;
tPDSet final;
if( vertexB->isIncoming(inpp.first) )
final = search(vertexB, inc.first, incoming, (*it)->id(),
outgoing, outgoing);
if( !final.empty() )
makeDiagrams(inc, fs, final, *it, HPDiagram::tChannel,
make_pair(vertexB, vertex), make_pair(true, false));
}
}
}
void TwoToTwoProcessConstructor::makeFourPointDiagrams(long parta, long partb,
long partc, VBPtr vert) {
if(processOption_>=1) {
PDVector::const_iterator loc = find(outgoing_.begin(),outgoing_.end(),
getParticleData(partc));
if(loc==outgoing_.end()) return;
}
tPDSet ext = search(vert, parta, incoming, partb,incoming, partc, outgoing);
if( ext.empty() ) return;
IDPair in(parta, partb);
for(tPDSet::const_iterator iter=ext.begin(); iter!=ext.end();
++iter) {
if(processOption_>=1) {
PDVector::const_iterator loc = find(outgoing_.begin(),outgoing_.end(),
*iter);
if(loc==outgoing_.end()) continue;
}
HPDiagram nhp(in,make_pair(partc, (*iter)->id()));
nhp.vertices = make_pair(vert, vert);
nhp.channelType = HPDiagram::fourPoint;
fixFSOrder(nhp);
if( !duplicate(nhp, processes_) ) {
assignToCF(nhp);
processes_.push_back(nhp);
}
}
}
void
TwoToTwoProcessConstructor::makeDiagrams(IDPair in, long out1, const tPDSet & out2,
PDPtr inter, HPDiagram::Channel chan,
VBPair vertexpair, BPair cross) {
if(processOption_>=1) {
PDVector::const_iterator loc = find(outgoing_.begin(),outgoing_.end(),
getParticleData(out1));
if(loc==outgoing_.end()) return;
}
for(tPDSet::const_iterator it = out2.begin(); it != out2.end(); ++it) {
if(processOption_>=1) {
PDVector::const_iterator loc = find(outgoing_.begin(),outgoing_.end(),
*it);
if(loc==outgoing_.end()) continue;
}
HPDiagram nhp( in,make_pair(out1, (*it)->id()) );
nhp.intermediate = inter;
nhp.vertices = vertexpair;
nhp.channelType = chan;
nhp.ordered = cross;
fixFSOrder(nhp);
if( !duplicate(nhp, processes_) ) {
assignToCF(nhp);
processes_.push_back(nhp);
}
}
}
set<tPDPtr>
TwoToTwoProcessConstructor::search(VBPtr vertex, long part1, direction d1,
long part2, direction d2, direction d3) {
if(vertex->getNpoint() != 3) return tPDSet();
if(d1 == incoming && getParticleData(part1)->CC()) part1 = -part1;
if(d2 == incoming && getParticleData(part2)->CC()) part2 = -part2;
vector<long> ext;
tPDSet third;
for(unsigned int ix = 0;ix < 3; ++ix) {
vector<long> pdlist = vertex->search(ix, part1);
ext.insert(ext.end(), pdlist.begin(), pdlist.end());
}
for(unsigned int ix = 0; ix < ext.size(); ix += 3) {
long id0 = ext.at(ix);
long id1 = ext.at(ix+1);
long id2 = ext.at(ix+2);
int pos;
if((id0 == part1 && id1 == part2) ||
(id0 == part2 && id1 == part1))
pos = ix + 2;
else if((id0 == part1 && id2 == part2) ||
(id0 == part2 && id2 == part1))
pos = ix + 1;
else if((id1 == part1 && id2 == part2) ||
(id1 == part2 && id2 == part1))
pos = ix;
else
pos = -1;
if(pos >= 0) {
tPDPtr p = getParticleData(ext[pos]);
if(d3 == incoming && p->CC()) p = p->CC();
third.insert(p);
}
}
return third;
}
set<tPDPtr>
TwoToTwoProcessConstructor::search(VBPtr vertex, long part1, direction d1,
long part2, direction d2, long part3, direction d3,
direction d4) {
if(vertex->getNpoint() != 4) return tPDSet();
if(d1 == incoming && getParticleData(part1)->CC()) part1 = -part1;
if(d2 == incoming && getParticleData(part2)->CC()) part2 = -part2;
if(d3 == incoming && getParticleData(part3)->CC()) part3 = -part3;
vector<long> ext;
tPDSet fourth;
for(unsigned int ix = 0;ix < 4; ++ix) {
vector<long> pdlist = vertex->search(ix, part1);
ext.insert(ext.end(), pdlist.begin(), pdlist.end());
}
for(unsigned int ix = 0;ix < ext.size(); ix += 4) {
long id0 = ext.at(ix); long id1 = ext.at(ix + 1);
long id2 = ext.at(ix + 2); long id3 = ext.at(ix + 3);
int pos;
if((id0 == part1 && id1 == part2 && id2 == part3) ||
(id0 == part1 && id1 == part3 && id2 == part2) ||
(id0 == part2 && id1 == part1 && id2 == part3) ||
(id0 == part2 && id1 == part3 && id2 == part1) ||
(id0 == part3 && id1 == part1 && id2 == part2) ||
(id0 == part3 && id1 == part2 && id2 == part1))
pos = ix + 3;
else if((id0 == part1 && id1 == part2 && id3 == part3) ||
(id0 == part1 && id1 == part3 && id3 == part2) ||
(id0 == part2 && id1 == part1 && id3 == part3) ||
(id0 == part2 && id1 == part3 && id3 == part1) ||
(id0 == part3 && id1 == part1 && id3 == part2) ||
(id0 == part3 && id1 == part2 && id3 == part1))
pos = ix + 2;
else if((id0 == part1 && id2 == part2 && id3 == part3) ||
(id0 == part1 && id2 == part3 && id3 == part2) ||
(id0 == part2 && id2 == part1 && id3 == part3) ||
(id0 == part2 && id2 == part3 && id3 == part1) ||
(id0 == part3 && id2 == part1 && id3 == part2) ||
(id0 == part3 && id2 == part2 && id3 == part1))
pos = ix + 1;
else if((id1 == part1 && id2 == part2 && id3 == part3) ||
(id1 == part1 && id2 == part3 && id3 == part2) ||
(id1 == part2 && id2 == part1 && id3 == part3) ||
(id1 == part2 && id2 == part3 && id3 == part1) ||
(id1 == part3 && id2 == part1 && id3 == part2) ||
(id1 == part3 && id2 == part2 && id3 == part1))
pos = ix;
else
pos = -1;
if(pos >= 0) {
tPDPtr p = getParticleData(ext[pos]);
if(d4 == incoming && p->CC())
p = p->CC();
fourth.insert(p);
}
}
return fourth;
}
void
TwoToTwoProcessConstructor::createMatrixElement(const HPDVector & process) const {
if ( process.empty() ) return;
// external particles
tcPDVector extpart(4);
extpart[0] = getParticleData(process[0].incoming.first);
extpart[1] = getParticleData(process[0].incoming.second);
extpart[2] = getParticleData(process[0].outgoing.first);
extpart[3] = getParticleData(process[0].outgoing.second);
// create the object
string objectname ("/Herwig/MatrixElements/");
string classname = MEClassname(extpart, objectname);
GeneralHardMEPtr matrixElement = dynamic_ptr_cast<GeneralHardMEPtr>
(generator()->preinitCreate(classname, objectname));
if( !matrixElement ) {
- stringstream message;
+ std::stringstream message;
message << "TwoToTwoProcessConstructor::createMatrixElement "
<< "- No matrix element object could be created for "
<< "the process "
<< extpart[0]->PDGName() << " " << extpart[0]->iSpin() << ","
<< extpart[1]->PDGName() << " " << extpart[1]->iSpin() << "->"
<< extpart[2]->PDGName() << " " << extpart[2]->iSpin() << ","
<< extpart[3]->PDGName() << " " << extpart[3]->iSpin()
<< ". Constructed class name: \"" << classname << "\"";
generator()->logWarning(TwoToTwoProcessConstructorError(message.str(),Exception::warning));
return;
}
// choice for the scale
unsigned int scale;
if(scaleChoice_==0) {
// check coloured initial and final state
bool inColour = ( extpart[0]->coloured() ||
extpart[1]->coloured());
bool outColour = ( extpart[2]->coloured() ||
extpart[3]->coloured());
if(inColour&&outColour) {
bool coloured = false;
for(unsigned int ix=0;ix<process.size();++ix) {
if(process[ix].intermediate&&
process[ix].intermediate->coloured()) {
coloured = true;
break;
}
}
scale = coloured ? 1 : 0;
}
else {
scale = 0;
}
}
else {
scale = scaleChoice_-1;
}
// set the information
matrixElement->setProcessInfo(process, colourFlow(extpart),
debug(), scale, scaleFactor_);
// insert it
generator()->preinitInterface(subProcess(), "MatrixElements",
subProcess()->MEs().size(),
"insert", matrixElement->fullName());
}
string TwoToTwoProcessConstructor::MEClassname(const vector<tcPDPtr> & extpart,
string & objname) const {
string classname("Herwig::ME");
for(vector<tcPDPtr>::size_type ix = 0; ix < extpart.size(); ++ix) {
if(ix == 2) classname += "2";
if(extpart[ix]->iSpin() == PDT::Spin0) classname += "s";
else if(extpart[ix]->iSpin() == PDT::Spin1) classname += "v";
else if(extpart[ix]->iSpin() == PDT::Spin1Half) classname += "f";
else if(extpart[ix]->iSpin() == PDT::Spin2) classname += "t";
else {
- stringstream message;
+ std::stringstream message;
message << "MEClassname() : Encountered an unknown spin for "
<< extpart[ix]->PDGName() << " while constructing MatrixElement "
<< "classname " << extpart[ix]->iSpin();
generator()->logWarning(TwoToTwoProcessConstructorError(message.str(),Exception::warning));
}
}
objname += "ME" + extpart[0]->PDGName() + extpart[1]->PDGName() + "2"
+ extpart[2]->PDGName() + extpart[3]->PDGName();
return classname;
}

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