Gabriele Cosmo
141 lines
5.1 KiB
C++
141 lines
5.1 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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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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G4bool G4ExcitedStringDecay::
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EnergyAndMomentumCorrector(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( !(SumMom<1) && !(SumMom>-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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// 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 generated nan momentum...");
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}
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SumMass += Output->operator[](cHadron)->GetDefinition()->GetPDGMass();
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if( !(SumMom<1) && !(SumMom>-1) )
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay generated nan mass...");
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}
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}
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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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if (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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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 << " 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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// 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 TRUE;
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}
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