Gabriele Cosmo
118 lines
4.5 KiB
C++
118 lines
4.5 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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//
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// $Id: G4VKinkyStringDecay.cc,v 1.3 2006/06/29 20:55:07 gunter Exp $
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// GEANT4 tag $Name: geant4-09-01 $
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// Maxim Komogorov
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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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// History: first implementation, Maxim Komogorov, 10-Oct-1998
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// -----------------------------------------------------------------------------
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#include "G4VKinkyStringDecay.hh"
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#include "G4KineticTrackVector.hh"
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#include "G4KineticTrack.hh"
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#include "Randomize.hh"
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//*****************************************************************************************************
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G4VKinkyStringDecay::G4VKinkyStringDecay(G4VLongitudinalStringDecay* theModal)
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{
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this->SetLongitudinalStringDecay(theModal);
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}
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//*****************************************************************************************************
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G4double G4VKinkyStringDecay::GetLightConeGluonZ(G4double zmin, G4double zmax)
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{
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G4double z, yf;
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do {
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z = zmin + G4UniformRand()*(zmax-zmin);
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yf = z*z +sqr(1 - z);
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}
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while (G4UniformRand() > yf);
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return z;
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}
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//*****************************************************************************************************
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G4KineticTrackVector* G4VKinkyStringDecay::FragmentString(const G4ExcitedString& String)
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{
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G4LorentzVector Mom = String.GetGluon()->Get4Momentum();
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G4ThreeVector Pos = String.GetGluon()->GetPosition();
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G4int QuarkEncoding = theLongitudinalStringDecay->SampleQuarkFlavor();
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G4ThreeVector Pquark=theLongitudinalStringDecay->SampleQuarkPt();
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G4double Pt2 = Pquark.mag2();
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G4double z = GetLightConeGluonZ(0, 1);
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G4double w = Mom.e() + Mom.pz();
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//... now compute quark longitudinal momentum and energy
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Pquark.setZ( (z*w - Pt2/(z*w))*0.5);
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G4double E = (z*w + Pt2/(z*w))*0.5;
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G4Parton* AntiColor = new G4Parton(-QuarkEncoding);
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AntiColor->SetPosition(Pos);
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G4LorentzVector AntiColorMom(-Pquark, E);
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AntiColor->Set4Momentum(AntiColorMom);
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G4Parton* Color = new G4Parton(*String.GetColorParton());
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G4ExcitedString Str1(Color, AntiColor, String.GetDirection());
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G4KineticTrackVector* KTV1 = theLongitudinalStringDecay->FragmentString(Str1);
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Color = new G4Parton(QuarkEncoding);
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Color->SetPosition(Pos);
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G4LorentzVector ColorMom(Pquark, E);
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Color->Set4Momentum(ColorMom);
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AntiColor = new G4Parton(*String.GetAntiColorParton());
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G4ExcitedString Str2(Color, AntiColor, String.GetDirection());
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G4KineticTrackVector* KTV2 = theLongitudinalStringDecay->FragmentString(Str2);
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if (KTV1 && KTV2)
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while(!KTV2->empty())
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{
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KTV1->push_back(KTV2->back());
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KTV1->erase(KTV1->end()-1);
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}
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return KTV1;
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}
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//*****************************************************************************************************
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