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diff --git a/Helicity/Vertex/Scalar/SSSVertex.cc b/Helicity/Vertex/Scalar/SSSVertex.cc
--- a/Helicity/Vertex/Scalar/SSSVertex.cc
+++ b/Helicity/Vertex/Scalar/SSSVertex.cc
@@ -1,58 +1,60 @@
// -*- C++ -*-
//
// SSSVertex.cc is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 2003-2017 Peter Richardson, Leif Lonnblad
//
// ThePEG is licenced under version 3 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 SSSVertex class.
//
#include "SSSVertex.h"
#include "ThePEG/Utilities/DescribeClass.h"
#include "ThePEG/Interface/ClassDocumentation.h"
using namespace ThePEG;
using namespace Helicity;
// The following static variable is needed for the type
// description system in ThePEG.
DescribeAbstractNoPIOClass<SSSVertex,AbstractSSSVertex>
describeThePEGSSSVertex("ThePEG::SSSVertex", "libThePEG.so");
void SSSVertex::Init() {
static ClassDocumentation<SSSVertex> documentation
("The SSSVertex class is the implementation of the SSS"
"vertex. All such vertices shoud inherit from it");
}
// evaluate the vertex
Complex SSSVertex::evaluate(Energy2 q2,
const ScalarWaveFunction & sca1,
const ScalarWaveFunction & sca2,
const ScalarWaveFunction & sca3) {
+ if(kinematics()) calculateKinematics(sca1.momentum(),sca2.momentum(),sca3.momentum());
// calculate the coupling
setCoupling(q2,sca1.particle(),sca2.particle(),sca3.particle());
// return the answer
return Complex(0.,1.)*norm()*sca1.wave()*sca2.wave()*sca3.wave();
}
// off-shell scalar
ScalarWaveFunction SSSVertex::evaluate(Energy2 q2,int iopt, tcPDPtr out,
const ScalarWaveFunction & sca1,
const ScalarWaveFunction & sca2,
complex<Energy> mass,
complex<Energy> width) {
// outgoing momentum
- Lorentz5Momentum pout = sca1.momentum()+sca2.momentum();
+ Lorentz5Momentum pout = sca1.momentum()+sca2.momentum();
+ if(kinematics()) calculateKinematics(sca1.momentum(),sca2.momentum(),pout);
// calculate the coupling
setCoupling(q2,sca1.particle(),sca2.particle(),out);
// wavefunction
Energy2 p2=pout.m2();
Complex fact=-norm()*sca1.wave()*sca2.wave()*propagator(iopt,p2,out,mass,width);
return ScalarWaveFunction(pout,out,fact);
}

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