1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // |
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28 | |
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29 | #ifndef G4SampleResonance_h |
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30 | #define G4SampleResonance_h 1 |
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31 | |
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32 | // ------------------------------------------------------------ |
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33 | // GEANT 4 class header file |
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34 | // |
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35 | // ---------------- G4SampleResonance ---------------- |
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36 | // by Henning Weber, March 2001. |
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37 | // helper class for sampling resonance masses |
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38 | // ------------------------------------------------------------ |
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39 | |
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40 | #include "globals.hh" |
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41 | #include <map> |
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42 | #include "G4ParticleDefinition.hh" |
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43 | |
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44 | |
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45 | class G4SampleResonance |
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46 | { |
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47 | public: |
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48 | |
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49 | G4double GetMinimumMass(const G4ParticleDefinition* p) const; |
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50 | G4double SampleMass(const G4double poleMass, |
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51 | const G4double gamma, |
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52 | const G4double minMass, |
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53 | const G4double maxMass) const; |
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54 | G4double SampleMass(const G4ParticleDefinition* p, const G4double maxMass) const; |
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55 | |
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56 | private: |
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57 | |
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58 | G4double BrWigInt0(const G4double x, const G4double gamma, const G4double m0) const |
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59 | { return 2.0*gamma*std::atan( 2.0 * (x-m0)/ gamma ); } |
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60 | |
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61 | G4double BrWigInt1(const G4double x, const G4double gamma, const G4double m0) const |
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62 | { return 0.5*gamma*gamma*std::log( (x-m0)*(x-m0)+gamma*gamma/4.0 ) + m0*BrWigInt0(x,gamma,m0); } |
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63 | |
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64 | G4double BrWigInv(const G4double x, const G4double gamma, const G4double m0) const |
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65 | { return 0.5*gamma*std::tan( 0.5*x/gamma )+m0; } |
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66 | |
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67 | public: |
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68 | |
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69 | typedef std::map<const G4ParticleDefinition*, G4double, std::less<const G4ParticleDefinition*> >::const_iterator minMassMapIterator; |
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70 | typedef std::map<const G4ParticleDefinition*, G4double, std::less<const G4ParticleDefinition*> > minMassMapType; |
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71 | |
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72 | private: |
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73 | |
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74 | static minMassMapType minMassCache; |
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75 | |
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76 | }; |
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77 | |
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78 | |
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79 | #endif |
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80 | |
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81 | |
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82 | |
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83 | |
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84 | |
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85 | |
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