00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // 00027 // $Id$ 00028 // 00029 // ----------------------------------------------------------------------------- 00030 // GEANT 4 class header file 00031 // 00032 // History: 00033 // Created by Mikhail Kossov, October 2006 00034 // CHIPS QGS fragmentation class 00035 // For comparison mirror member functions are taken from G4 classes: 00036 // G4QGSParticipants 00037 // G4QGSModels 00038 // G4ExcitedStringDecay 00039 // ----------------------------------------------------------------------------- 00040 // Short description: CHIPS string fragmentation class 00041 // ----------------------------------------------------------------------------- 00042 // 00043 #ifndef G4QFragmentation_h 00044 #define G4QFragmentation_h 1 00045 00046 #include "globals.hh" 00047 #include "G4LorentzVector.hh" 00048 #include "Randomize.hh" 00049 #include "G4QNucleus.hh" 00050 #include "G4Quasmon.hh" 00051 #include "G4QHadronVector.hh" 00052 #include "G4QEnvironment.hh" 00053 #include "G4QInteractionVector.hh" 00054 #include "G4QProbability.hh" 00055 #include "G4QPartonPairVector.hh" 00056 #include "G4QuasiFreeRatios.hh" 00057 #include "G4QDiffractionRatio.hh" 00058 #include "G4QStringVector.hh" 00059 00060 class G4QFragmentation 00061 { 00062 public: 00063 G4QFragmentation(const G4QNucleus& aNucleus, const G4QHadron& aPrimary); 00064 ~G4QFragmentation(); 00065 00066 G4QHadronVector* Fragment(); // Calls Breeder & fragments Quasmons inside ResidualNucleus 00067 00068 // Static functions 00069 static void SetParameters(G4int nC, G4double strTens, G4double tubeDens, G4double SigPt); 00070 00071 protected: 00072 G4bool ExciteDiffParticipants(G4QHadron* aPartner, G4QHadron* bPartner) const; //@@Once 00073 G4bool ExciteSingDiffParticipants(G4QHadron* aPartner, G4QHadron* bPartner) const;//@@Onc 00074 std::pair<G4int,G4int> ReducePair(G4int P1, G4int P2) const; // Reduce Q-pairs to singles 00075 void Breeder(); // String fragmentation algoritm, which makes Hadrons & Quasmons from Str 00076 // @@ At present always SingleDiffractive, so this is a fake member function 00077 G4bool IsSingleDiffractive() {G4bool r=false; if(G4UniformRand()<1.) r=true; return r;} 00078 G4int SumPartonPDG(G4int PDG1, G4int PFG2) const; 00079 G4double ChooseX(G4double Xmin, G4double Xmax) const; 00080 G4ThreeVector GaussianPt(G4double widthSquare, G4double maxPtSquare) const; 00081 G4int AnnihilationOrder(G4int LS, G4int MS, G4int uP, G4int mP, G4int sP, G4int nP); 00082 void SwapPartons(); // Try to swap partons of strings, if one of strings has negative M2 00083 void EvaporateResidual(G4QHadron* hadrNuc); //Evaporate hadrNucleus, NuclFrag->theResult 00084 private: 00085 enum {SOFT, DIFFRACTIVE}; 00086 // static model parameters 00087 static G4int nCutMax; // Maximum number of Soft Cuts 00088 static G4double stringTension; // String Tension to absorb energy 00089 static G4double tubeDensity; // Nucleon density in the FluxTube 00090 static G4double widthOfPtSquare; // width^2 of pt(StringExcitation) 00091 00092 // Body 00093 G4QNucleus theNucleus; // TargetNucleus moving fromLStoCM 00094 G4QStringVector strings; // Vector of created strings 00095 G4QuasmonVector theQuasmons; // Strings converter to Quasmons 00096 G4QHadronVector* theResult; // Pointer to the OUTPUT Result 00097 G4double maxEn; // Energy absorbed by the nucleus 00098 G4double maxNuc; // #0fNucleons in the Flux Tube 00099 G4QuasiFreeRatios* theQuasiElastic; // For CHIPS Quasi-Elastic 00100 G4QDiffractionRatio* theDiffraction; // For CHIPS Diffraction 00101 G4QCHIPSWorld* theWorld; // Pointer to the CHIPS World 00102 }; 00103 00104 #endif