Gabriele Cosmo
85 lines
3.1 KiB
C++
85 lines
3.1 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4SampleResonance.hh,v 1.5 2002/12/12 19:17:57 gunter Exp $
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// GEANT4 tag $Name: geant4-05-00 $
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//
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#ifndef G4SampleResonance_h
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#define G4SampleResonance_h 1
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// ------------------------------------------------------------
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// GEANT 4 class header file
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//
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// ---------------- G4SampleResonance ----------------
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// by Henning Weber, March 2001.
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// helper class for sampling resonance masses
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// ------------------------------------------------------------
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#include "globals.hh"
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#include "g4std/map"
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#include "G4ParticleDefinition.hh"
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class G4SampleResonance
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{
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public:
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G4double GetMinimumMass(const G4ParticleDefinition* p) const;
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G4double SampleMass(const G4double poleMass,
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const G4double gamma,
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const G4double minMass,
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const G4double maxMass) const;
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G4double SampleMass(const G4ParticleDefinition* p, const G4double maxMass) const;
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private:
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G4double BrWigInt0(const G4double x, const G4double gamma, const G4double m0) const
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{ return 2.0*gamma*atan( 2.0 * (x-m0)/ gamma ); }
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G4double BrWigInt1(const G4double x, const G4double gamma, const G4double m0) const
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{ return 0.5*gamma*gamma*log( (x-m0)*(x-m0)+gamma*gamma/4.0 ) + m0*BrWigInt0(x,gamma,m0); }
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G4double BrWigInv(const G4double x, const G4double gamma, const G4double m0) const
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{ return 0.5*gamma*tan( 0.5*x/gamma )+m0; }
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public:
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typedef G4std::map<const G4ParticleDefinition*, G4double, G4std::less<const G4ParticleDefinition*> >::const_iterator minMassMapIterator;
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typedef G4std::map<const G4ParticleDefinition*, G4double, G4std::less<const G4ParticleDefinition*> > minMassMapType;
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private:
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static minMassMapType minMassCache;
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};
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#endif
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