Gabriele Cosmo
139 lines
5.4 KiB
C++
139 lines
5.4 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: G4TauPlus.cc 95951 2016-03-03 10:44:16Z gcosmo $
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//
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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, based on object model of
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// 4th April 1996, G.Cosmo
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// 7 July 1996 H.Kurashige
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// **********************************************************************
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// New impelemenataion as an utility class M.Asai, 26 July 2004
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// ----------------------------------------------------------------------
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#include "G4TauPlus.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4ParticleTable.hh"
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#include "G4PhaseSpaceDecayChannel.hh"
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#include "G4TauLeptonicDecayChannel.hh"
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#include "G4DecayTable.hh"
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// ######################################################################
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// ### TAPLUS ###
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// ######################################################################
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G4TauPlus* G4TauPlus::theInstance = 0;
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G4TauPlus* G4TauPlus::Definition()
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{
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if (theInstance !=0) return theInstance;
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const G4String name = "tau+";
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// search in particle table]
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G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
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G4ParticleDefinition* anInstance = pTable->FindParticle(name);
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if (anInstance ==0)
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{
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// create particle
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//
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// Arguments for constructor are as follows
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// name mass width charge
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// 2*spin parity C-conjugation
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// 2*Isospin 2*Isospin3 G-parity
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// type lepton number baryon number PDG encoding
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// stable lifetime decay table
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// shortlived subType anti_encoding
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anInstance = new G4ParticleDefinition(
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name, 1.77686*GeV, 2.267e-9*MeV, 1.*eplus,
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1, 0, 0,
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0, 0, 0,
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"lepton", -1, 0, -15,
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false, 290.3e-6*ns, NULL,
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false, "tau"
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);
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// Bohr Magnetron
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G4double muB = 0.5*eplus*hbar_Planck/(anInstance->GetPDGMass()/c_squared) ;
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anInstance->SetPDGMagneticMoment( muB * 1.00118);
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//create Decay Table
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G4DecayTable* table = new G4DecayTable();
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// create decay channels
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G4VDecayChannel* mode;
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// tau+ -> mu+ + nu_mu + anti_nu_tau
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mode = new G4TauLeptonicDecayChannel("tau+",0.1736,"mu+");
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table->Insert(mode);
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// tau+ -> e+ + nu_e + anti_nu_tau
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mode = new G4TauLeptonicDecayChannel("tau+",0.1784,"e+");
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table->Insert(mode);
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// tau+ -> pi+ + anti_nu_tau
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mode = new G4PhaseSpaceDecayChannel("tau+",0.1106,2,"pi+","anti_nu_tau");
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table->Insert(mode);
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// tau+ -> pi0 + pi0 + pi+ + anti_nu_tau
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mode = new G4PhaseSpaceDecayChannel("tau+",0.2541,3,"pi0","pi+","anti_nu_tau");
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table->Insert(mode);
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// tau+ -> pi0 + pi0 + pi+ + anti_nu_tau
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mode = new G4PhaseSpaceDecayChannel();
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mode->SetParent("tau+");
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mode->SetBR(0.0917);
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mode->SetNumberOfDaughters(4);
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mode->SetDaughter(0,"pi0");
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mode->SetDaughter(1,"pi0");
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mode->SetDaughter(2,"pi+");
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mode->SetDaughter(3,"anti_nu_tau");
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table->Insert(mode);
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// tau+ -> pi+ + pi+ + pi- + anti_nu_tau
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mode = new G4PhaseSpaceDecayChannel();
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mode->SetParent("tau+");
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mode->SetBR(0.0946);
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mode->SetNumberOfDaughters(4);
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mode->SetDaughter(0,"pi+");
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mode->SetDaughter(1,"pi+");
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mode->SetDaughter(2,"pi-");
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mode->SetDaughter(3,"anti_nu_tau");
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table->Insert(mode);
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anInstance->SetDecayTable(table);
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}
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theInstance = reinterpret_cast<G4TauPlus*>(anInstance);
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return theInstance;
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}
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G4TauPlus* G4TauPlus::TauPlusDefinition()
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{
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return Definition();
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}
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G4TauPlus* G4TauPlus::TauPlus()
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{
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return Definition();
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}
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