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	diff --git a/Shower/ShowerHandler.cc b/Shower/ShowerHandler.cc
	--- a/Shower/ShowerHandler.cc
	+++ b/Shower/ShowerHandler.cc
	@@ -1,724 +1,724 @@
	// -- C++ --
	//
	// ShowerHandler.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 ShowerHandler class.
	//

	#include "ShowerHandler.h"
	#include "ThePEG/Interface/ClassDocumentation.h"
	#include "ThePEG/Interface/Reference.h"
	#include "ThePEG/Interface/Parameter.h"
	#include "ThePEG/Interface/ParVector.h"
	#include "ThePEG/Interface/Switch.h"
	#include "ThePEG/PDF/PartonExtractor.h"
	#include "ThePEG/PDF/PartonBinInstance.h"
	#include "Herwig++/PDT/StandardMatchers.h"
	#include "ThePEG/Cuts/Cuts.h"
	#include "ThePEG/Handlers/StandardXComb.h"
	#include "ThePEG/Utilities/Throw.h"
	#include "Herwig++/Shower/Base/Evolver.h"
	#include "Herwig++/Shower/Base/ShowerParticle.h"
	#include "ThePEG/Persistency/PersistentOStream.h"
	#include "ThePEG/Persistency/PersistentIStream.h"
	#include "ThePEG/Repository/EventGenerator.h"
	#include "Herwig++/Utilities/EnumParticles.h"
	#include "Herwig++/PDF/MPIPDF.h"
	#include "Herwig++/PDF/MinBiasPDF.h"
	#include "ThePEG/Handlers/EventHandler.h"
	#include "Herwig++/Shower/Base/ShowerTree.h"
	#include "Herwig++/Shower/Base/HardTree.h"
	#include "Herwig++/Shower/Base/KinematicsReconstructor.h"
	#include "Herwig++/Shower/Base/PartnerFinder.h"
	#include "Herwig++/PDF/HwRemDecayer.h"
	#include <cassert>

	using namespace Herwig;

	ShowerHandler::~ShowerHandler() {}

	ShowerHandler * ShowerHandler::currentHandler_ = 0;

	void ShowerHandler::doinit() {
	CascadeHandler::doinit();
	// copy particles to decay before showering from input vector to the
	// set used in the simulation
	particlesDecayInShower_.insert(inputparticlesDecayInShower_.begin(),
	inputparticlesDecayInShower_.end());
	ShowerTree::_decayInShower = particlesDecayInShower_;
	}

	IBPtr ShowerHandler::clone() const {
	return new_ptr(*this);
	}

	IBPtr ShowerHandler::fullclone() const {
	return new_ptr(*this);
	}

	ShowerHandler::ShowerHandler() :
	pdfFreezingScale_(2.5*GeV),
	maxtry_(10),maxtryMPI_(10),maxtryDP_(10), subProcess_() {
	inputparticlesDecayInShower_.push_back( 6 ); // top
	inputparticlesDecayInShower_.push_back( 23 ); // Z0
	inputparticlesDecayInShower_.push_back( 24 ); // W+/-
	inputparticlesDecayInShower_.push_back( 25 ); // h0
	}

	void ShowerHandler::doinitrun(){
	CascadeHandler::doinitrun();
	//can't use isMPIOn here, because the EventHandler is not set at that stage
	if(MPIHandler_){
	MPIHandler_->initialize();
	if(MPIHandler_->softInt())
	remDec_->initSoftInteractions(MPIHandler_->Ptmin(), MPIHandler_->beta());
	}
	ShowerTree::_decayInShower = particlesDecayInShower_;
	}

	void ShowerHandler::dofinish(){
	CascadeHandler::dofinish();
	if(MPIHandler_) MPIHandler_->finalize();
	}

	void ShowerHandler::persistentOutput(PersistentOStream & os) const {
	os << evolver_ << remDec_ << ounit(pdfFreezingScale_,GeV) << maxtry_
	<< maxtryMPI_ << maxtryDP_ << inputparticlesDecayInShower_
	- << particlesDecayInShower_ << MPIHandler_;
	+ << particlesDecayInShower_ << MPIHandler_ << PDFA_ << PDFB_;
	}

	void ShowerHandler::persistentInput(PersistentIStream & is, int) {
	is >> evolver_ >> remDec_ >> iunit(pdfFreezingScale_,GeV) >> maxtry_
	>> maxtryMPI_ >> maxtryDP_ >> inputparticlesDecayInShower_
	- >> particlesDecayInShower_ >> MPIHandler_;
	+ >> particlesDecayInShower_ >> MPIHandler_ >> PDFA_ >> PDFB_;
	}

	ClassDescription<ShowerHandler> ShowerHandler::initShowerHandler;
	// Definition of the static class description member.

	void ShowerHandler::Init() {

	static ClassDocumentation<ShowerHandler> documentation
	("Main driver class for the showering.",
	"The Shower evolution was performed using an algorithm described in "
	"\\cite{Marchesini:1983bm,Marchesini:1987cf,Gieseke:2003rz,Bahr:2008pv}.",
	"%\\cite{Marchesini:1983bm}\n"
	"\\bibitem{Marchesini:1983bm}\n"
	" G.~Marchesini and B.~R.~Webber,\n"
	" ``Simulation Of QCD Jets Including Soft Gluon Interference,''\n"
	" Nucl.\\ Phys.\\ B {\\bf 238}, 1 (1984).\n"
	" %%CITATION = NUPHA,B238,1;%%\n"
	"%\\cite{Marchesini:1987cf}\n"
	"\\bibitem{Marchesini:1987cf}\n"
	" G.~Marchesini and B.~R.~Webber,\n"
	" ``Monte Carlo Simulation of General Hard Processes with Coherent QCD\n"
	" Radiation,''\n"
	" Nucl.\\ Phys.\\ B {\\bf 310}, 461 (1988).\n"
	" %%CITATION = NUPHA,B310,461;%%\n"
	"%\\cite{Gieseke:2003rz}\n"
	"\\bibitem{Gieseke:2003rz}\n"
	" S.~Gieseke, P.~Stephens and B.~Webber,\n"
	" ``New formalism for QCD parton showers,''\n"
	" JHEP {\\bf 0312}, 045 (2003)\n"
	" [arXiv:hep-ph/0310083].\n"
	" %%CITATION = JHEPA,0312,045;%%\n"
	);

	static Reference<ShowerHandler,Evolver>
	interfaceEvolver("Evolver",
	"A reference to the Evolver object",
	&Herwig::ShowerHandler::evolver_,
	false, false, true, false);

	static Reference<ShowerHandler,HwRemDecayer>
	interfaceRemDecayer("RemDecayer",
	"A reference to the Remnant Decayer object",
	&Herwig::ShowerHandler::remDec_,
	false, false, true, false);

	static Parameter<ShowerHandler,Energy> interfacePDFFreezingScale
	("PDFFreezingScale",
	"The PDF freezing scale",
	&ShowerHandler::pdfFreezingScale_, GeV, 2.5GeV, 2.0GeV, 10.0*GeV,
	false, false, Interface::limited);

	static Parameter<ShowerHandler,unsigned int> interfaceMaxTry
	("MaxTry",
	"The maximum number of attempts for the main showering loop",
	&ShowerHandler::maxtry_, 10, 1, 100,
	false, false, Interface::limited);

	static Parameter<ShowerHandler,unsigned int> interfaceMaxTryMPI
	("MaxTryMPI",
	"The maximum number of regeneration attempts for an additional scattering",
	&ShowerHandler::maxtryMPI_, 10, 0, 100,
	false, false, Interface::limited);

	static Parameter<ShowerHandler,unsigned int> interfaceMaxTryDP
	("MaxTryDP",
	"The maximum number of regeneration attempts for an additional hard scattering",
	&ShowerHandler::maxtryDP_, 10, 0, 100,
	false, false, Interface::limited);

	static ParVector<ShowerHandler,long> interfaceDecayInShower
	("DecayInShower",
	"PDG codes of the particles to be decayed in the shower",
	&ShowerHandler::inputparticlesDecayInShower_, -1, 0l, -10000000l, 10000000l,
	false, false, Interface::limited);

	static Reference<ShowerHandler,UEBase> interfaceMPIHandler
	("MPIHandler",
	"The object that administers all additional scatterings.",
	&ShowerHandler::MPIHandler_, false, false, true, true);

	static Reference<ShowerHandler,PDFBase> interfacePDFA
	("PDFA",
	"The PDF for beam particle A. Overrides the particle's own PDF setting.",
	&ShowerHandler::PDFA_, false, false, true, true, false);

	static Reference<ShowerHandler,PDFBase> interfacePDFB
	("PDFB",
	"The PDF for beam particle B. Overrides the particle's own PDF setting.",
	&ShowerHandler::PDFB_, false, false, true, true, false);

	}

	void ShowerHandler::cascade() {
	tcPDFPtr first = firstPDF().pdf();
	tcPDFPtr second = secondPDF().pdf();

	if ( PDFA_ ) first = PDFA_;
	if ( PDFB_ ) second = PDFB_;

	resetPDFs(make_pair(first,second));

	// get the incoming partons
	tPPair incomingPartons =
	eventHandler()->currentCollision()->primarySubProcess()->incoming();
	// and the parton bins
	PBIPair incomingBins =
	make_pair(lastExtractor()->partonBinInstance(incomingPartons.first),
	lastExtractor()->partonBinInstance(incomingPartons.second));
	// and the incoming hadrons
	tPPair incomingHadrons =
	eventHandler()->currentCollision()->incoming();
	// check if incoming hadron == incoming parton
	// and get the incoming hadron if exists or parton otherwise
	incoming_ = make_pair(incomingBins.first ?
	incomingBins.first ->particle() : incomingPartons.first,
	incomingBins.second ?
	incomingBins.second->particle() : incomingPartons.second);
	// check the collision is of the beam particles
	// and if not boost collision to the right frame
	// i.e. the hadron-hadron CMF of the collision
	bool btotal(false);
	LorentzRotation rtotal;
	if(incoming_.first != incomingHadrons.first \|\|
	incoming_.second != incomingHadrons.second ) {
	btotal = true;
	boostCollision(false);
	}
	// set the current ShowerHandler
	currentHandler_ = this;
	// first shower the hard process
	useMe();
	try {
	SubProPtr sub = eventHandler()->currentCollision()->primarySubProcess();
	incomingPartons = cascade(sub,lastXCombPtr());
	}
	catch(ShowerTriesVeto &veto){
	throw Exception() << "Failed to generate the shower after "
	<< veto.tries
	<< " attempts in Evolver::showerHardProcess()"
	<< Exception::eventerror;
	}
	// if a non-hadron collision return (both incoming non-hadronic)
	if( ( !incomingBins.first\|\|
	!isResolvedHadron(incomingBins.first ->particle()))&&
	( !incomingBins.second\|\|
	!isResolvedHadron(incomingBins.second->particle()))) {
	// boost back to lab if needed
	if(btotal) boostCollision(true);
	// unset the current ShowerHandler
	currentHandler_ = 0;
	return;
	}
	// get the remnants for hadronic collision
	pair<tRemPPtr,tRemPPtr> remnants(getRemnants(incomingBins));
	// set the starting scale of the forced splitting to the PDF freezing scale
	remDec_->initialize(remnants, incoming_, *currentStep(), pdfFreezingScale());
	// do the first forcedSplitting
	try {
	remDec_->doSplit(incomingPartons, make_pair(firstPDF() .pdf(),
	secondPDF().pdf()), true);
	}
	catch (ExtraScatterVeto) {
	throw Exception() << "Remnant extraction failed in "
	<< "ShowerHandler::cascade() from primary interaction"
	<< Exception::eventerror;
	}
	// if no MPI return
	if( !isMPIOn() ) {
	remDec_->finalize();
	// boost back to lab if needed
	if(btotal) boostCollision(true);
	// unset the current ShowerHandler
	currentHandler_ = 0;
	return;
	}
	// generate the multiple scatters use modified pdf's now:
	setMPIPDFs();
	// additional "hard" processes
	unsigned int tries(0);
	// This is the loop over additional hard scatters (most of the time
	// only one, but who knows...)
	for(unsigned int i=1; i <= getMPIHandler()->additionalHardProcs(); i++){
	//counter for regeneration
	unsigned int multSecond = 0;
	// generate the additional scatters
	while( multSecond < getMPIHandler()->multiplicity(i) ) {
	// generate the hard scatter
	tStdXCombPtr lastXC = getMPIHandler()->generate(i);
	SubProPtr sub = lastXC->construct();
	// add to the Step
	newStep()->addSubProcess(sub);
	// increment the counters
	tries++;
	multSecond++;
	if(tries == maxtryDP_)
	throw Exception() << "Failed to establish the requested number "
	<< "of additional hard processes. If this error "
	<< "occurs often, your selection of additional "
	<< "scatter is probably unphysical"
	<< Exception::eventerror;
	// Generate the shower. If not possible veto the event
	try {
	incomingPartons = cascade(sub,lastXC);
	}
	catch(ShowerTriesVeto &veto){
	throw Exception() << "Failed to generate the shower of "
	<< "a secondary hard process after "
	<< veto.tries
	<< " attempts in Evolver::showerHardProcess()"
	<< Exception::eventerror;
	}
	try {
	// do the forcedSplitting
	remDec_->doSplit(incomingPartons, make_pair(firstPDF().pdf(),
	secondPDF().pdf()), false);
	}
	catch(ExtraScatterVeto){
	//remove all particles associated with the subprocess
	newStep()->removeParticle(incomingPartons.first);
	newStep()->removeParticle(incomingPartons.second);
	//remove the subprocess from the list
	newStep()->removeSubProcess(sub);
	//regenerate the scattering
	multSecond--;
	continue;
	}
	// connect with the remnants but don't set Remnant colour,
	// because that causes problems due to the multiple colour lines.
	if ( !remnants.first ->extract(incomingPartons.first , false) \|\|
	!remnants.second->extract(incomingPartons.second, false) )
	throw Exception() << "Remnant extraction failed in "
	<< "ShowerHandler::cascade() for additional scatter"
	<< Exception::runerror;
	}
	}
	// the underlying event processes
	unsigned int ptveto(1), veto(0);
	unsigned int max(getMPIHandler()->multiplicity());
	for(unsigned int i=0; i<max; i++) {
	// check how often this scattering has been regenerated
	if(veto > maxtryMPI_) break;
	//generate PSpoint
	tStdXCombPtr lastXC = getMPIHandler()->generate();
	SubProPtr sub = lastXC->construct();
	//If Algorithm=1 additional scatters of the signal type
	// with pt > ptmin have to be vetoed
	//with probability 1/(m+1), where m is the number of occurances in this event
	if( getMPIHandler()->Algorithm() == 1 ){
	//get the pT
	Energy pt = sub->outgoing().front()->momentum().perp();
	if(pt > getMPIHandler()->PtForVeto() && UseRandom::rnd() < 1./(ptveto+1) ){
	ptveto++;
	i--;
	continue;
	}
	}
	// add to the SubProcess to the step
	newStep()->addSubProcess(sub);
	// Run the Shower. If not possible veto the scattering
	try {
	incomingPartons = cascade(sub,lastXC);
	}
	// discard this extra scattering, but try the next one
	catch(ShowerTriesVeto) {
	newStep()->removeSubProcess(sub);
	//regenerate the scattering
	veto++;
	i--;
	continue;
	}
	try{
	//do the forcedSplitting
	remDec_->doSplit(incomingPartons, make_pair(firstPDF().pdf(),
	secondPDF().pdf()), false);
	}
	catch (ExtraScatterVeto) {
	//remove all particles associated with the subprocess
	newStep()->removeParticle(incomingPartons.first);
	newStep()->removeParticle(incomingPartons.second);
	//remove the subprocess from the list
	newStep()->removeSubProcess(sub);
	//regenerate the scattering
	veto++;
	i--;
	continue;
	}
	//connect with the remnants but don't set Remnant colour,
	//because that causes problems due to the multiple colour lines.
	if ( !remnants.first ->extract(incomingPartons.first , false) \|\|
	!remnants.second->extract(incomingPartons.second, false) )
	throw Exception() << "Remnant extraction failed in "
	<< "ShowerHandler::cascade() for MPI hard scattering"
	<< Exception::runerror;
	//reset veto counter
	veto = 0;
	}
	// finalize the remnants
	remDec_->finalize(getMPIHandler()->colourDisrupt(),
	getMPIHandler()->softMultiplicity());
	// boost back to lab if needed
	if(btotal) boostCollision(true);
	// unset the current ShowerHandler
	currentHandler_ = 0;
	}

	void ShowerHandler::fillEventRecord() {
	// create a new step
	StepPtr pstep = newStep();
	assert(!done_.empty());
	assert(done_[0]->isHard());
	// insert the steps
	for(unsigned int ix=0;ix<done_.size();++ix) {
	done_[ix]->fillEventRecord(pstep,
	evolver_->isISRadiationON(),
	evolver_->isFSRadiationON());
	}
	}

	void ShowerHandler::findShoweringParticles() {
	// clear the storage
	hard_=ShowerTreePtr();
	decay_.clear();
	done_.clear();
	// temporary storage of the particles
	set<PPtr> hardParticles;
	// outgoing particles from the hard process
	PVector outgoing = currentSubProcess()->outgoing();
	set<PPtr> outgoingset(outgoing.begin(),outgoing.end());
	// loop over the tagged particles
	tPVector thetagged;
	if( firstInteraction() ){
	thetagged = tagged();
	}
	else{
	thetagged.insert(thetagged.end(),
	outgoing.begin(),outgoing.end());
	}
	bool isHard=false;
	for (tParticleVector::const_iterator
	taggedP = thetagged.begin();
	taggedP != thetagged.end(); ++taggedP) {
	// if a remnant don't consider
	if(eventHandler()->currentCollision()->isRemnant(*taggedP))
	continue;
	// find the parent and whether its a colourless s-channel resonance
	bool isDecayProd=false;
	tPPtr parent;
	if(!(*taggedP)->parents().empty()) {
	parent = (*taggedP)->parents()[0];
	// check if from s channel decaying colourless particle
	isDecayProd = decayProduct(parent);
	}
	// add to list of outgoing hard particles if needed
	isHard \|=(outgoingset.find(*taggedP) != outgoingset.end());
	if(isDecayProd) hardParticles.insert(findParent(parent,isHard,outgoingset));
	else hardParticles.insert(*taggedP);
	}
	// there must be something to shower
	if(hardParticles.empty())
	throw Exception() << "No particles to shower in "
	<< "ShowerHandler::fillShoweringParticles"
	<< Exception::eventerror;
	if(!isHard)
	throw Exception() << "Starting on decay not yet implemented in "
	<< "ShowerHandler::findShoweringParticles()"
	<< Exception::runerror;
	// create the hard process ShowerTree
	ParticleVector out(hardParticles.begin(),hardParticles.end());
	hard_=new_ptr(ShowerTree(currentSubProcess()->incoming(),out, decay_));
	hard_->setParents();
	}

	tPPair ShowerHandler::cascade(tSubProPtr sub,
	XCPtr xcomb) {
	// get the current step
	current_ = currentStep();
	// get the current subprocess
	subProcess_ = sub;
	// start of the try block for the whole showering process
	unsigned int countFailures=0;
	while (countFailures<maxtry_) {
	try {
	// find the particles in the hard process and the decayed particles to shower
	findShoweringParticles();
	// if no hard process
	if(!hard_) throw Exception() << "Shower starting with a decay"
	<< "is not implemented"
	<< Exception::runerror;
	// perform the shower for the hard process
	evolver_->showerHardProcess(hard_,xcomb);
	done_.push_back(hard_);
	hard_->updateAfterShower(decay_);
	// if no decaying particles to shower break out of the loop
	if(decay_.empty()) break;
	// shower the decay products
	while(!decay_.empty()) {
	// find particle whose production process has been showered
	ShowerDecayMap::iterator dit = decay_.begin();
	while(!dit->second->parent()->hasShowered() && dit!=decay_.end()) ++dit;
	assert(dit!=decay_.end());
	// get the particle
	ShowerTreePtr decayingTree = dit->second;
	// remove it from the multimap
	decay_.erase(dit);
	// make sure the particle has been decayed
	decayingTree->decay(decay_);
	// now shower the decay
	evolver_->showerDecay(decayingTree);
	done_.push_back(decayingTree);
	decayingTree->updateAfterShower(decay_);
	}
	// suceeded break out of the loop
	break;
	}
	catch (KinematicsReconstructionVeto) {
	++countFailures;
	}
	}
	// if loop exited because of too many tries, throw event away
	if (countFailures >= maxtry_) {
	hard_=ShowerTreePtr();
	decay_.clear();
	done_.clear();
	throw Exception() << "Too many tries for main while loop "
	<< "in ShowerHandler::cascade()."
	<< Exception::eventerror;
	}
	//enter the particles in the event record
	fillEventRecord();
	// clear storage
	hard_=ShowerTreePtr();
	decay_.clear();
	done_.clear();
	// non hadronic case return
	if (!isResolvedHadron(incoming_.first ) &&
	!isResolvedHadron(incoming_.second) )
	return incoming_;
	// remake the remnants (needs to be after the colours are sorted
	// out in the insertion into the event record)
	if ( firstInteraction() ) return remakeRemnant(sub->incoming());
	//Return the new pair of incoming partons. remakeRemnant is not
	//necessary here, because the secondary interactions are not yet
	//connected to the remnants.
	return make_pair(findFirstParton(sub->incoming().first ),
	findFirstParton(sub->incoming().second));
	}

	PPtr ShowerHandler::findParent(PPtr original, bool & isHard,
	set<PPtr> outgoingset) const {
	PPtr parent=original;
	isHard \|=(outgoingset.find(original) != outgoingset.end());
	if(!original->parents().empty()) {
	PPtr orig=original->parents()[0];
	if(current_->find(orig)&&decayProduct(orig)) {
	parent=findParent(orig,isHard,outgoingset);
	}
	}
	return parent;
	}

	ShowerHandler::RemPair
	ShowerHandler::getRemnants(PBIPair incomingBins) {
	RemPair remnants;
	// first beam particle
	if(incomingBins.first&&!incomingBins.first->remnants().empty()) {
	remnants.first =
	dynamic_ptr_cast<tRemPPtr>(incomingBins.first->remnants()[0] );
	if(remnants.first) {
	ParticleVector children=remnants.first->children();
	for(unsigned int ix=0;ix<children.size();++ix) {
	if(children[ix]->dataPtr()==remnants.first->dataPtr())
	remnants.first = dynamic_ptr_cast<RemPPtr>(children[ix]);
	}
	//remove existing colour lines from the remnants
	if(remnants.first->colourLine())
	remnants.first->colourLine()->removeColoured(remnants.first);
	if(remnants.first->antiColourLine())
	remnants.first->antiColourLine()->removeAntiColoured(remnants.first);
	}
	}
	// seconnd beam particle
	if(incomingBins.second&&!incomingBins. second->remnants().empty()) {
	remnants.second =
	dynamic_ptr_cast<tRemPPtr>(incomingBins.second->remnants()[0] );
	if(remnants.second) {
	ParticleVector children=remnants.second->children();
	for(unsigned int ix=0;ix<children.size();++ix) {
	if(children[ix]->dataPtr()==remnants.second->dataPtr())
	remnants.second = dynamic_ptr_cast<RemPPtr>(children[ix]);
	}
	//remove existing colour lines from the remnants
	if(remnants.second->colourLine())
	remnants.second->colourLine()->removeColoured(remnants.second);
	if(remnants.second->antiColourLine())
	remnants.second->antiColourLine()->removeAntiColoured(remnants.second);
	}
	}
	assert(remnants.first \|\| remnants.second);
	return remnants;
	}

	tPPair ShowerHandler::remakeRemnant(tPPair oldp){
	// get the parton extractor
	PartonExtractor & pex = *lastExtractor();
	// get the new partons
	tPPair newp = make_pair(findFirstParton(oldp.first ),
	findFirstParton(oldp.second));
	// if the same do nothing
	if(newp == oldp) return oldp;
	// Creates the new remnants and returns the new PartonBinInstances
	PBIPair newbins = pex.newRemnants(oldp, newp, newStep());
	newStep()->addIntermediate(newp.first);
	newStep()->addIntermediate(newp.second);
	// return the new partons
	return newp;
	}

	PPtr ShowerHandler::findFirstParton(tPPtr seed) const{
	if(seed->parents().empty()) return seed;
	tPPtr parent = seed->parents()[0];
	//if no parent there this is a loose end which will
	//be connected to the remnant soon.
	if(!parent \|\| parent == incoming_.first \|\|
	parent == incoming_.second ) return seed;
	else return findFirstParton(parent);
	}

	bool ShowerHandler::decayProduct(tPPtr particle) const {
	// must be time-like and not incoming
	if(particle->momentum().m2()<=ZERO\|\|
	particle == currentSubProcess()->incoming().first\|\|
	particle == currentSubProcess()->incoming().second) return false;
	// if only 1 outgoing and this is it
	if(currentSubProcess()->outgoing().size()==1 &&
	currentSubProcess()->outgoing()[0]==particle) return true;
	// must not be the s-channel intermediate otherwise
	if(find(currentSubProcess()->incoming().first->children().begin(),
	currentSubProcess()->incoming().first->children().end(),particle)!=
	currentSubProcess()->incoming().first->children().end()&&
	find(currentSubProcess()->incoming().second->children().begin(),
	currentSubProcess()->incoming().second->children().end(),particle)!=
	currentSubProcess()->incoming().second->children().end()&&
	currentSubProcess()->incoming().first ->children().size()==1&&
	currentSubProcess()->incoming().second->children().size()==1)
	return false;
	// if non-coloured this is enough
	if(!particle->dataPtr()->coloured()) return true;
	// if coloured must be unstable
	if(particle->dataPtr()->stable()) return false;
	// must not have same particle type as a child
	int id = particle->id();
	for(unsigned int ix=0;ix<particle->children().size();++ix)
	if(particle->children()[ix]->id()==id) return false;
	// otherwise its a decaying particle
	return true;
	}

	namespace {

	void addChildren(tPPtr in,set<tPPtr> & particles) {
	particles.insert(in);
	for(unsigned int ix=0;ix<in->children().size();++ix)
	addChildren(in->children()[ix],particles);
	}
	}

	void ShowerHandler::boostCollision(bool boost) {
	// calculate boost from lab to rest
	if(!boost) {
	Lorentz5Momentum ptotal=incoming_.first ->momentum()+incoming_.second->momentum();
	boost_ = LorentzRotation(-ptotal.boostVector());
	Axis axis((boost_*incoming_.first ->momentum()).vect().unit());
	if(axis.perp2()>0.) {
	double sinth(sqrt(sqr(axis.x())+sqr(axis.y())));
	boost_.rotate(acos(-axis.z()),Axis(-axis.y()/sinth,axis.x()/sinth,0.));
	}
	}
	// first call performs the boost and second inverse
	// get the particles to be boosted
	set<tPPtr> particles;
	addChildren(incoming_.first,particles);
	addChildren(incoming_.second,particles);
	// apply the boost
	for(set<tPPtr>::const_iterator cit=particles.begin();
	cit!=particles.end();++cit) {
	(*cit)->transform(boost_);
	}
	if(!boost) boost_.invert();
	}

	void ShowerHandler::setMPIPDFs() {

	if ( !mpipdfs_.first ) {
	// first have to check for MinBiasPDF
	tcMinBiasPDFPtr first = dynamic_ptr_cast<tcMinBiasPDFPtr>(firstPDF().pdf());
	if(first)
	mpipdfs_.first = new_ptr(MPIPDF(first->originalPDF()));
	else
	mpipdfs_.first = new_ptr(MPIPDF(firstPDF().pdf()));
	}

	if ( !mpipdfs_.second ) {
	tcMinBiasPDFPtr second = dynamic_ptr_cast<tcMinBiasPDFPtr>(secondPDF().pdf());
	if(second)
	mpipdfs_.second = new_ptr(MPIPDF(second->originalPDF()));
	else
	mpipdfs_.second = new_ptr(MPIPDF(secondPDF().pdf()));
	}

	// reset the PDFs stored in the base class
	resetPDFs(mpipdfs_);

	}

	bool ShowerHandler::isResolvedHadron(tPPtr particle) {
	if(!HadronMatcher::Check(particle->data())) return false;
	for(unsigned int ix=0;ix<particle->children().size();++ix) {
	if(particle->children()[ix]->id()==ExtraParticleID::Remnant) return true;
	}
	return false;
	}

	HardTreePtr ShowerHandler::generateCKKW(ShowerTreePtr ) const {
	return HardTreePtr();
	}

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