Gabriele Cosmo
84 lines
3.2 KiB
C++
84 lines
3.2 KiB
C++
//
|
|
// ********************************************************************
|
|
// * 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. *
|
|
// ********************************************************************
|
|
//
|
|
|
|
#ifndef G4SampleResonance_h
|
|
#define G4SampleResonance_h 1
|
|
|
|
// ------------------------------------------------------------
|
|
// GEANT 4 class header file
|
|
//
|
|
// ---------------- G4SampleResonance ----------------
|
|
// by Henning Weber, March 2001.
|
|
// helper class for sampling resonance masses
|
|
// ------------------------------------------------------------
|
|
|
|
#include "globals.hh"
|
|
#include <map>
|
|
#include "G4ParticleDefinition.hh"
|
|
#include "G4Log.hh"
|
|
|
|
class G4SampleResonance
|
|
{
|
|
public:
|
|
|
|
G4double GetMinimumMass(const G4ParticleDefinition* p) const;
|
|
G4double SampleMass(const G4double poleMass,
|
|
const G4double gamma,
|
|
const G4double minMass,
|
|
const G4double maxMass) const;
|
|
G4double SampleMass(const G4ParticleDefinition* p, const G4double maxMass) const;
|
|
|
|
private:
|
|
|
|
G4double BrWigInt0(const G4double x, const G4double gamma, const G4double m0) const
|
|
{ return 2.0*gamma*std::atan( 2.0 * (x-m0)/ gamma ); }
|
|
|
|
G4double BrWigInt1(const G4double x, const G4double gamma, const G4double m0) const
|
|
{ return 0.5*gamma*gamma*G4Log( (x-m0)*(x-m0)+gamma*gamma/4.0 ) + m0*BrWigInt0(x,gamma,m0); }
|
|
|
|
G4double BrWigInv(const G4double x, const G4double gamma, const G4double m0) const
|
|
{ return 0.5*gamma*std::tan( 0.5*x/gamma )+m0; }
|
|
|
|
public:
|
|
|
|
typedef std::map<const G4ParticleDefinition*, G4double, std::less<const G4ParticleDefinition*> >::const_iterator minMassMapIterator;
|
|
typedef std::map<const G4ParticleDefinition*, G4double, std::less<const G4ParticleDefinition*> > minMassMapType;
|
|
|
|
private:
|
|
|
|
static G4ThreadLocal minMassMapType *minMassCache_G4MT_TLS_;
|
|
|
|
};
|
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
|
|
|