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diff --git a/MatrixElement/HardVertex.cc b/MatrixElement/HardVertex.cc
--- a/MatrixElement/HardVertex.cc
+++ b/MatrixElement/HardVertex.cc
@@ -1,59 +1,60 @@
// -*- C++ -*-
//
// HardVertex.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 HardVertex class.
//
// Author: Peter Richardson
//
#include "ThePEG/EventRecord/SpinInfo.h"
#include "HardVertex.h"
#include "ThePEG/Interface/ClassDocumentation.h"
using namespace Herwig;
NoPIOClassDescription<HardVertex> HardVertex::initHardVertex;
// Definition of the static class description member.
void HardVertex::Init() {
static ClassDocumentation<HardVertex> documentation
("The HardVertex class implements the vertex for a hard "
"interaction for the Herwig++ spin correlation algorithm");
}
// method to get the rho matrix for a given outgoing particle
RhoDMatrix HardVertex::getRhoMatrix(int i,bool) const {
// get the rho matrices for the outgoing particles
vector<RhoDMatrix> rhoout(outgoing().size()-1);
for(int ix=0,N=outgoing().size();ix<N;++ix) {
if(ix<i) rhoout[ix ] =
outgoing()[ix]->DMatrix();
else if(ix>i) rhoout[ix-1] =
outgoing()[ix]->DMatrix();
}
// calculate the spin density matrix
return _matrixelement.
calculateRhoMatrix(i,
incoming()[0]->rhoMatrix(),
incoming()[1]->rhoMatrix(),rhoout);
}
// method to get the D matrix for an incoming particle
RhoDMatrix HardVertex::getDMatrix(int i) const {
// get rho rho matrices for the outgoing particles
vector<RhoDMatrix> rhoout(outgoing().size());
for(unsigned int ix=0,N=outgoing().size();ix<N;++ix)
rhoout[ix] = outgoing()[ix]->DMatrix();
+ unsigned int iother = i==0 ? 1 : 0;
// calculate the decay matrix
return _matrixelement.
- calculateDMatrix(i,incoming()[1]->rhoMatrix(),rhoout);
+ calculateDMatrix(i,incoming()[iother]->rhoMatrix(),rhoout);
}

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