Gabriele Cosmo
257 lines
9.5 KiB
C++
257 lines
9.5 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// Historic fragment from M.Komogorov; clean-up still necessary @@@
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#include "G4ExcitedStringDecay.hh"
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#include "G4KineticTrack.hh"
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G4ExcitedStringDecay::G4ExcitedStringDecay()
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{
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theStringDecay=NULL;
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}
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G4ExcitedStringDecay::G4ExcitedStringDecay(G4VLongitudinalStringDecay * aStringDecay)
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: theStringDecay(aStringDecay)
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{}
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G4ExcitedStringDecay::G4ExcitedStringDecay(const G4ExcitedStringDecay &) : G4VStringFragmentation()
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{
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}
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G4ExcitedStringDecay::~G4ExcitedStringDecay()
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{
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}
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const G4ExcitedStringDecay & G4ExcitedStringDecay::operator=(const G4ExcitedStringDecay &)
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay::operator= meant to not be accessable");
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return *this;
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}
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int G4ExcitedStringDecay::operator==(const G4ExcitedStringDecay &) const
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{
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return 0;
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}
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int G4ExcitedStringDecay::operator!=(const G4ExcitedStringDecay &) const
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{
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return 1;
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}
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G4KineticTrackVector *G4ExcitedStringDecay::FragmentString
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(const G4ExcitedString &theString)
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{
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if ( theStringDecay == NULL )
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theStringDecay=new G4LundStringFragmentation();
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return theStringDecay->FragmentString(theString);
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}
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G4KineticTrackVector *G4ExcitedStringDecay::FragmentStrings
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(const G4ExcitedStringVector * theStrings)
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{
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G4LorentzVector KTsum(0.,0.,0.,0.);
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for ( unsigned int astring=0; astring < theStrings->size(); astring++)
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{
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KTsum+= theStrings->operator[](astring)->Get4Momentum();
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if( !(KTsum.e()<1) && !(KTsum.e()>-1) )
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{
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throw G4HadronicException(__FILE__, __LINE__,
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"G4ExcitedStringDecay::FragmentStrings received nan string...");
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}
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}
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G4KineticTrackVector * theResult = new G4KineticTrackVector;
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G4int attempts(0);
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G4bool success=false;
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do {
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std::for_each(theResult->begin() , theResult->end() , DeleteKineticTrack());
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theResult->clear();
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attempts++;
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G4LorentzVector KTsecondaries(0.,0.,0.,0.);
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G4bool NeedEnergyCorrector=false;
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for ( unsigned int astring=0; astring < theStrings->size(); astring++)
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{
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//G4cout<<G4endl<<"String No "<<astring+1<<" "<<theStrings->operator[](astring)->Get4Momentum().mag()<<G4endl;
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G4KineticTrackVector * generatedKineticTracks = NULL;
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if ( theStrings->operator[](astring)->IsExcited() )
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{
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generatedKineticTracks=FragmentString(*theStrings->operator[](astring));
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} else {
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generatedKineticTracks = new G4KineticTrackVector;
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generatedKineticTracks->push_back(theStrings->operator[](astring)->GetKineticTrack());
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}
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if (generatedKineticTracks == NULL)
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{
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G4cerr << "G4VPartonStringModel:No KineticTracks produced" << G4endl;
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continue;
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}
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G4LorentzVector KTsum1(0.,0.,0.,0.);
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for ( unsigned int aTrack=0; aTrack<generatedKineticTracks->size();aTrack++)
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{
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//G4cout<<" Prod part "<<(*generatedKineticTracks)[aTrack]->GetDefinition()->GetParticleName()<<" "<<(*generatedKineticTracks)[aTrack]->Get4Momentum()<<G4endl;
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theResult->push_back(generatedKineticTracks->operator[](aTrack));
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KTsum1+= (*generatedKineticTracks)[aTrack]->Get4Momentum();
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}
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KTsecondaries+=KTsum1;
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if ( KTsum1.e() > 0 && std::abs((KTsum1.e()-theStrings->operator[](astring)->Get4Momentum().e()) / KTsum1.e()) > perMillion )
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{
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//--debug-- G4cout << "String secondaries(" <<generatedKineticTracks->size()<< ") momentum: "
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//--debug-- << theStrings->operator[](astring)->Get4Momentum() << " " << KTsum1 << G4endl;
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NeedEnergyCorrector=true;
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}
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// clean up
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delete generatedKineticTracks;
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}
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//--DEBUG G4cout << "Strings/secs total 4 momentum " << KTsum << " " <<KTsecondaries << G4endl;
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success=true;
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if ( NeedEnergyCorrector ) success=EnergyAndMomentumCorrector(theResult, KTsum);
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} while(!success && (attempts < 100));
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#ifdef debug_ExcitedStringDecay
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G4LorentzVector KTsum1=0;
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for ( unsigned int aTrack=0; aTrack<theResult->size();aTrack++)
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{
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G4cout << " corrected tracks .. " << (*theResult)[aTrack]->GetDefinition()->GetParticleName()
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<<" " << (*theResult)[aTrack]->Get4Momentum() << G4endl;
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KTsum1+= (*theResult)[aTrack]->Get4Momentum();
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}
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G4cout << "Needcorrector/success " << NeedEnergyCorrector << "/" << success << ", Corrected total 4 momentum " << KTsum1 << G4endl;
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if ( ! success ) G4cout << "failed to correct E/p" << G4endl;
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#endif
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return theResult;
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}
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G4bool G4ExcitedStringDecay::EnergyAndMomentumCorrector
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(G4KineticTrackVector* Output, G4LorentzVector& TotalCollisionMom)
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{
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const int nAttemptScale = 500;
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const double ErrLimit = 1.E-5;
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if (Output->empty())
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return TRUE;
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G4LorentzVector SumMom;
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G4double SumMass = 0;
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G4double TotalCollisionMass = TotalCollisionMom.m();
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if( !(TotalCollisionMass<1) && !(TotalCollisionMass>-1) )
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{
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std::cout << "TotalCollisionMomentum = "<<TotalCollisionMom<<G4endl;
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throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay received nan mass...");
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}
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//G4cout<<G4endl<<"EnergyAndMomentumCorrector "<<Output->size()<<G4endl;
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// Calculate sum hadron 4-momenta and summing hadron mass
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unsigned int cHadron;
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for(cHadron = 0; cHadron < Output->size(); cHadron++)
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{
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SumMom += Output->operator[](cHadron)->Get4Momentum();
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if( !(SumMom<1) && !(SumMom>-1) )
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay::EnergyAndMomentumCorrector() received nan momentum...");
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}
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SumMass += Output->operator[](cHadron)->GetDefinition()->GetPDGMass();
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if( !(SumMass<1) && !(SumMass>-1) )
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay::EnergyAndMomentumCorrector() received nan mass...");
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}
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}
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//G4cout<<"SumMass TotalCollisionMass "<<SumMass<<" "<<TotalCollisionMass<<G4endl;
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// Cannot correct a single particle
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if (Output->size() < 2) return FALSE;
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if (SumMass > TotalCollisionMass) return FALSE;
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SumMass = SumMom.m2();
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if (SumMass < 0) return FALSE;
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SumMass = std::sqrt(SumMass);
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// Compute c.m.s. hadron velocity and boost KTV to hadron c.m.s.
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G4ThreeVector Beta = -SumMom.boostVector();
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Output->Boost(Beta);
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// Scale total c.m.s. hadron energy (hadron system mass).
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// It should be equal interaction mass
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G4double Scale = 1;
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G4int cAttempt = 0;
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G4double Sum = 0;
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G4bool success = false;
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for(cAttempt = 0; cAttempt < nAttemptScale; cAttempt++)
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{
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Sum = 0;
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for(cHadron = 0; cHadron < Output->size(); cHadron++)
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{
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G4LorentzVector HadronMom = Output->operator[](cHadron)->Get4Momentum();
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HadronMom.setVect(Scale*HadronMom.vect());
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G4double E = std::sqrt(HadronMom.vect().mag2() + sqr(Output->operator[](cHadron)->GetDefinition()->GetPDGMass()));
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HadronMom.setE(E);
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Output->operator[](cHadron)->Set4Momentum(HadronMom);
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Sum += E;
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}
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Scale = TotalCollisionMass/Sum;
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#ifdef debug_G4ExcitedStringDecay
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G4cout << "Scale-1=" << Scale -1
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<< ", TotalCollisionMass=" << TotalCollisionMass
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<< ", Sum=" << Sum
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<< G4endl;
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#endif
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if (std::fabs(Scale - 1) <= ErrLimit)
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{
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success = true;
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break;
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}
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}
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#ifdef debug_G4ExcitedStringDecay
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if(!success)
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{
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G4cout << "G4ExcitedStringDecay::EnergyAndMomentumCorrector - Warning"<<G4endl;
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G4cout << " Scale not unity at end of iteration loop: "<<TotalCollisionMass<<" "<<Sum<<" "<<Scale<<G4endl;
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G4cout << " Number of secondaries: " << Output->size() << G4endl;
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G4cout << " Wanted total energy: " << TotalCollisionMom.e() << G4endl;
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G4cout << " Increase number of attempts or increase ERRLIMIT"<<G4endl;
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// throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay failed to correct...");
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}
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#endif
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// Compute c.m.s. interaction velocity and KTV back boost
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Beta = TotalCollisionMom.boostVector();
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Output->Boost(Beta);
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return success;
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}
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