Gabriele Cosmo
153 lines
5.7 KiB
C++
153 lines
5.7 KiB
C++
//
|
|
// ********************************************************************
|
|
// * License and Disclaimer *
|
|
// * *
|
|
// * The Geant4 software is copyright of the Copyright Holders of *
|
|
// * the Geant4 Collaboration. It is provided under the terms and *
|
|
// * conditions of the Geant4 Software License, included in the file *
|
|
// * LICENSE and available at http://cern.ch/geant4/license . These *
|
|
// * include a list of copyright holders. *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. Please see the license in the file LICENSE and URL above *
|
|
// * for the full disclaimer and the limitation of liability. *
|
|
// * *
|
|
// * This code implementation is the result of the scientific and *
|
|
// * technical work of the GEANT4 collaboration. *
|
|
// * By using, copying, modifying or distributing the software (or *
|
|
// * any work based on the software) you agree to acknowledge its *
|
|
// * use in resulting scientific publications, and indicate your *
|
|
// * acceptance of all terms of the Geant4 Software license. *
|
|
// ********************************************************************
|
|
//
|
|
// Historic fragment from M.Komogorov; clean-up still necessary @@@
|
|
#include "G4ExcitedStringDecay.hh"
|
|
#include "G4KineticTrack.hh"
|
|
|
|
G4ExcitedStringDecay::G4ExcitedStringDecay()
|
|
{
|
|
theStringDecay=NULL;
|
|
}
|
|
|
|
G4ExcitedStringDecay::G4ExcitedStringDecay(G4VLongitudinalStringDecay * aStringDecay)
|
|
: theStringDecay(aStringDecay)
|
|
{}
|
|
|
|
G4ExcitedStringDecay::G4ExcitedStringDecay(const G4ExcitedStringDecay &) : G4VStringFragmentation()
|
|
{
|
|
}
|
|
|
|
G4ExcitedStringDecay::~G4ExcitedStringDecay()
|
|
{
|
|
}
|
|
|
|
const G4ExcitedStringDecay & G4ExcitedStringDecay::operator=(const G4ExcitedStringDecay &)
|
|
{
|
|
throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay::operator= meant to not be accessable");
|
|
return *this;
|
|
}
|
|
|
|
int G4ExcitedStringDecay::operator==(const G4ExcitedStringDecay &) const
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int G4ExcitedStringDecay::operator!=(const G4ExcitedStringDecay &) const
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
G4bool G4ExcitedStringDecay::
|
|
EnergyAndMomentumCorrector(G4KineticTrackVector* Output, G4LorentzVector& TotalCollisionMom)
|
|
{
|
|
const int nAttemptScale = 500;
|
|
const double ErrLimit = 1.E-5;
|
|
if (Output->empty())
|
|
return TRUE;
|
|
G4LorentzVector SumMom;
|
|
G4double SumMass = 0;
|
|
G4double TotalCollisionMass = TotalCollisionMom.m();
|
|
if( !(TotalCollisionMass<1) && !(TotalCollisionMass>-1) )
|
|
{
|
|
std::cout << "TotalCollisionMomentum = "<<TotalCollisionMom<<G4endl;
|
|
throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay received nan mass...");
|
|
}
|
|
// Calculate sum hadron 4-momenta and summing hadron mass
|
|
unsigned int cHadron;
|
|
for(cHadron = 0; cHadron < Output->size(); cHadron++)
|
|
{
|
|
SumMom += Output->operator[](cHadron)->Get4Momentum();
|
|
if( !(SumMom<1) && !(SumMom>-1) )
|
|
{
|
|
throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay::EnergyAndMomentumCorrector() received nan momentum...");
|
|
}
|
|
SumMass += Output->operator[](cHadron)->GetDefinition()->GetPDGMass();
|
|
if( !(SumMass<1) && !(SumMass>-1) )
|
|
{
|
|
throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay::EnergyAndMomentumCorrector() received nan mass...");
|
|
}
|
|
}
|
|
// Cannot correct a single particle
|
|
if (Output->size() < 2) return FALSE;
|
|
|
|
if (SumMass > TotalCollisionMass) return FALSE;
|
|
SumMass = SumMom.m2();
|
|
if (SumMass < 0) return FALSE;
|
|
SumMass = std::sqrt(SumMass);
|
|
|
|
// Compute c.m.s. hadron velocity and boost KTV to hadron c.m.s.
|
|
G4ThreeVector Beta = -SumMom.boostVector();
|
|
Output->Boost(Beta);
|
|
|
|
// Scale total c.m.s. hadron energy (hadron system mass).
|
|
// It should be equal interaction mass
|
|
G4double Scale = 1;
|
|
G4int cAttempt = 0;
|
|
G4double Sum = 0;
|
|
G4bool success = false;
|
|
for(cAttempt = 0; cAttempt < nAttemptScale; cAttempt++)
|
|
{
|
|
Sum = 0;
|
|
for(cHadron = 0; cHadron < Output->size(); cHadron++)
|
|
{
|
|
G4LorentzVector HadronMom = Output->operator[](cHadron)->Get4Momentum();
|
|
HadronMom.setVect(Scale*HadronMom.vect());
|
|
G4double E = std::sqrt(HadronMom.vect().mag2() + sqr(Output->operator[](cHadron)->GetDefinition()->GetPDGMass()));
|
|
HadronMom.setE(E);
|
|
Output->operator[](cHadron)->Set4Momentum(HadronMom);
|
|
Sum += E;
|
|
}
|
|
Scale = TotalCollisionMass/Sum;
|
|
if (Scale - 1 <= ErrLimit)
|
|
{
|
|
success = true;
|
|
break;
|
|
}
|
|
#ifdef debug_G4ExcitedStringDecay
|
|
std::cout << "Scale-1=" << Scale -1
|
|
<< ", TotalCollisionMass=" << TotalCollisionMass
|
|
<< ", Sum=" << Sum
|
|
<< std::endl;
|
|
#endif
|
|
}
|
|
|
|
if(!success)
|
|
{
|
|
G4cout << "G4ExcitedStringDecay::EnergyAndMomentumCorrector - Warning"<<G4endl;
|
|
G4cout << " Scale not unity at end of iteration loop: "<<TotalCollisionMass<<" "<<Sum<<" "<<Scale<<G4endl;
|
|
G4cout << " Increase number of attempts or increase ERRLIMIT"<<G4endl;
|
|
throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay failed to correct...");
|
|
}
|
|
|
|
// Compute c.m.s. interaction velocity and KTV back boost
|
|
Beta = TotalCollisionMom.boostVector();
|
|
Output->Boost(Beta);
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
|