source: trunk/source/particles/leptons/src/G4TauMinus.cc@ 1335

//
// ********************************************************************
// * 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.          *
// ********************************************************************
//
//
// $Id: G4TauMinus.cc,v 1.19 2009/10/09 14:34:02 kurasige Exp $
// GEANT4 tag $Name: geant4-09-03-cand-01 $
//
// 
// ----------------------------------------------------------------------
//      GEANT 4 class implementation file
//
//      History: first implementation, based on object model of
//      4th April 1996, G.Cosmo
//      7 July 1996                   H.Kurashige 
// **********************************************************************
//  New impelemenataion as an utility class  M.Asai, 26 July 2004
// ----------------------------------------------------------------------

#include "G4TauMinus.hh"
#include "G4ParticleTable.hh"

#include "G4PhaseSpaceDecayChannel.hh"
#include "G4TauLeptonicDecayChannel.hh"
#include "G4DecayTable.hh"

// ######################################################################
// ###                          TAUMINUS                             ###
// ######################################################################
G4TauMinus* G4TauMinus::theInstance = 0;

G4TauMinus* G4TauMinus::Definition()
{
  if (theInstance !=0) return theInstance;
  const G4String name = "tau-";
  // search in particle table]
  G4ParticleTable* pTable = G4ParticleTable::GetParticleTable();
  G4ParticleDefinition* anInstance = pTable->FindParticle(name);
  if (anInstance ==0)
  {
  // create particle
  //
  //    Arguments for constructor are as follows
  //               name             mass          width         charge
  //             2*spin           parity  C-conjugation
  //          2*Isospin       2*Isospin3       G-parity
  //               type    lepton number  baryon number   PDG encoding
  //             stable         lifetime    decay table
  //             shortlived      subType    anti_encoding
   anInstance = new G4ParticleDefinition(
                 name,     1.77684*GeV,  2.280e-9*MeV,    -1.*eplus, 
                    1,               0,             0,          
                    0,               0,             0,             
             "lepton",               1,             0,          15,
                false,     290.6e-6*ns,          NULL,
             false,           "tau"
              );

   // Bohr Magnetron
   G4double muB =  -0.5*eplus*hbar_Planck/(1.77699*GeV/c_squared) ;
   
   anInstance->SetPDGMagneticMoment( muB * 2. * 1.00116);

  //create Decay Table 
  G4DecayTable* table = new G4DecayTable();

  // create decay channels
  G4VDecayChannel* mode;
  // tau- -> mu- + anti_nu_mu + nu_tau
  mode = new G4TauLeptonicDecayChannel("tau-",0.1736,"mu-");
  table->Insert(mode);
  // tau- -> e- + anti_nu_e + nu_tau
  mode = new G4TauLeptonicDecayChannel("tau-",0.1784,"e-");
  table->Insert(mode);
  // tau- -> pi- + nu_tau
  mode = new G4PhaseSpaceDecayChannel("tau-",0.1106,2,"pi-","nu_tau");
  table->Insert(mode);
  // tau- -> pi0 + pi- + nu_tau
  mode = new G4PhaseSpaceDecayChannel("tau-",0.2541,3,"pi0","pi-","nu_tau");
  table->Insert(mode);
  // tau- -> pi0 + pi0 + pi- + nu_tau
  mode = new G4PhaseSpaceDecayChannel();
  mode->SetParent("tau-");
  mode->SetBR(0.0917);
  mode->SetNumberOfDaughters(4);
  mode->SetDaughter(0,"pi0");
  mode->SetDaughter(1,"pi0");
  mode->SetDaughter(2,"pi-");
  mode->SetDaughter(3,"nu_tau");
  table->Insert(mode);
  // tau- -> pi- + pi- + pi+ + nu_tau
  mode = new G4PhaseSpaceDecayChannel();
  mode->SetParent("tau-");
  mode->SetBR(0.0946);
  mode->SetNumberOfDaughters(4);
  mode->SetDaughter(0,"pi-");
  mode->SetDaughter(1,"pi-");
  mode->SetDaughter(2,"pi+");
  mode->SetDaughter(3,"nu_tau");
  table->Insert(mode);

  anInstance->SetDecayTable(table);
  }
  theInstance = reinterpret_cast<G4TauMinus*>(anInstance);
  return theInstance;
}

G4TauMinus*  G4TauMinus::TauMinusDefinition()
{
  return Definition();
}

G4TauMinus*  G4TauMinus::TauMinus()
{
  return Definition();
}