pdg_functions.cc

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// -*- C++ -*-
//
// Package:     FastSimulation/Particle
// Class  :     pdg_functions
//
// Implementation:
//     [Notes on implementation]
//
// Original Author:  Christopher Jones
//         Created:  Mon, 04 Mar 2019 19:53:06 GMT
//

// system include files

// user include files
#include "FastSimulation/Particle/interface/pdg_functions.h"

double pdg::mass(int pdgID, HepPDT::ParticleDataTable const* theTable) {
  auto info = theTable->particle(HepPDT::ParticleID(pdgID));
  if (info) {
    return info->mass().value();
  }
  return kInvalidMass;
}

double pdg::cTau(int pdgID, HepPDT::ParticleDataTable const* theTable) {
  auto info = theTable->particle(HepPDT::ParticleID(pdgID));
  double ct = kInvalidCtau;
  if (info) {
    // The lifetime is 0. in the Pythia Particle Data Table !
    //    ct=tab->theTable()->particle(ParticleID(myId))->lifetime().value();

    // Get it from the width (apparently Gamma/c!)
    double w = info->totalWidth().value();
    if (w != 0. && pdgID != 1000022) {
      ct = 6.582119e-25 / w / 10.;  // ctau in cm
    } else {
      // Temporary fix of a bug in the particle data table
      unsigned amyId = abs(pdgID);
      if (amyId != 22 &&       // photon
          amyId != 11 &&       // e+/-
          amyId != 10 &&       // nu_e
          amyId != 12 &&       // nu_mu
          amyId != 14 &&       // nu_tau
          amyId != 1000022 &&  // Neutralino
          amyId != 1000039 &&  // Gravitino
          amyId != 2112 &&     // neutron/anti-neutron
          amyId != 2212 &&     // proton/anti-proton
          amyId != 101 &&      // Deutreron etc..
          amyId != 102 &&      // Deutreron etc..
          amyId != 103 &&      // Deutreron etc..
          amyId != 104) {      // Deutreron etc..
        ct = 0.;
        /* */
      }
    }
  }

  /*
  std::cout << setw(20) << setprecision(18) 
       << "myId/ctau/width = " << myId << " " 
       << ct << " " << w << endl;  
  */
  return ct;
}