Gabriele Cosmo
68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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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 statement,
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// and all its terms.
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//
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// $Id: G4Parton.cc,v 1.3.8.1.2.2 1999/12/09 17:44:08 gcosmo Exp $
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// GEANT4 tag $Name: geant4-01-01 $
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//
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// ------------------------------------------------------------
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// GEANT 4 class implementation file
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//
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// For information related to this code contact:
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// CERN, CN Division, ASD group
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// ---------------- G4Parton ----------------
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// by Gunter Folger, June 1998.
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// class for Parton (inside a string) used by Parton String Models
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// ------------------------------------------------------------
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#include "G4Parton.hh"
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G4Parton::G4Parton(G4int PDGcode)
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{
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PDGencoding=PDGcode;
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theX = 0;
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theDefinition=G4ParticleTable::GetParticleTable()->FindParticle(PDGencoding);;
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if (theDefinition == NULL)
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{
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G4cout << "Encoding = "<<PDGencoding<<G4endl;
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G4Exception("G4Parton::GetDefinition(): Encoding not in particle table");
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}
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}
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G4Parton::G4Parton(const G4Parton &right)
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{
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PDGencoding = right.PDGencoding;
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theMomentum = right.theMomentum;
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thePosition = right.thePosition;
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theX = right.theX;
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theDefinition = right.theDefinition;
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}
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const G4Parton & G4Parton::operator=(const G4Parton &right)
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{
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PDGencoding=right.GetPDGcode();
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theMomentum=right.Get4Momentum();
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thePosition=right.GetPosition();
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theX = right.theX;
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theDefinition = right.theDefinition;
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return *this;
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}
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G4Parton::~G4Parton()
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{}
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void G4Parton::DefineMomentumInZ(G4double aLightConeMomentum, G4bool aDirection)
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{
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G4double Mass = GetMass();
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G4LorentzVector a4Momentum = Get4Momentum();
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aLightConeMomentum*=theX;
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G4double TransverseMass2 = sqr(a4Momentum.px()) + sqr(a4Momentum.py()) + sqr(Mass);
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a4Momentum.setPz(0.5*(aLightConeMomentum - TransverseMass2/aLightConeMomentum)*(aDirection? 1: -1));
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a4Momentum.setE( 0.5*(aLightConeMomentum + TransverseMass2/aLightConeMomentum));
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Set4Momentum(a4Momentum);
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}
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