SimG4Core/CustomPhysics/src/CMSSQInelasticCrossSection.cc - master - githubmirror/cmssw

SimG4Core/CustomPhysics/src/CMSSQInelasticCrossSection.cc

39 строк1 KB

Vladimir

code-format

06 июл 2025, 15:06

06 июл 2025, 15:064a85dd5

#include "G4SystemOfUnits.hh"
#include "G4DynamicParticle.hh"
#include "G4NistManager.hh"

#include "SimG4Core/CustomPhysics/interface/CMSSQ.h"
#include "SimG4Core/CustomPhysics/interface/CMSAntiSQ.h"
#include "SimG4Core/CustomPhysics/interface/CMSSQInelasticCrossSection.h"

CMSSQInelasticCrossSection::CMSSQInelasticCrossSection(double mass) : G4VCrossSectionDataSet("SQ-neutron") {
  nist = G4NistManager::Instance();
  theSQ = CMSSQ::SQ(mass);
  theAntiSQ = CMSAntiSQ::AntiSQ(mass);
}

G4bool CMSSQInelasticCrossSection::IsElementApplicable(const G4DynamicParticle* aPart, G4int Z, const G4Material*) {
  return true;
}

G4double CMSSQInelasticCrossSection::GetElementCrossSection(const G4DynamicParticle* aPart,
                                                            G4int Z,
                                                            const G4Material*) {
  // return zero for particle instead of antiparticle
  // sexaquark interaction with matter expected really tiny
  if (aPart->GetDefinition() != theAntiSQ)
    return 0;

  //I don't want to interact on hydrogen
  if (Z <= 1) {
    return 0.0;
  }

  // get the atomic weight (to estimate nr neutrons)
  G4double A = nist->GetAtomicMassAmu(Z);

  // put the X section low for the antiS to get a flat interaction rate,
  // but also make it scale with the number of neutrons in the material
  // because we are going to interact on neutrons, not on protons
  return (100. * (A - (G4double)Z) / (G4double)Z) * millibarn;
}