Gabriele Cosmo
125 lines
5.1 KiB
C++
125 lines
5.1 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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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. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// Author: Michael Kelsey (SLAC)
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// Date: 15 April 2013
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//
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// Description: Subclass of models/util G4VHadDecayAlgorithm which uses
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// old INUCL parametrizations for momentum and angular
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// distributions.
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//
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#ifndef G4CascadeFinalStateAlgorithm_hh
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#define G4CascadeFinalStateAlgorithm_hh 1
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#include "globals.hh"
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#include "G4VHadDecayAlgorithm.hh"
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#include "G4LorentzConvertor.hh"
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class G4InuclElementaryParticle;
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class G4MultiBodyMomentumDist;
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class G4TwoBodyAngularDist;
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class G4VMultiBodyMomDst;
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class G4VTwoBodyAngDst;
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class G4CascadeFinalStateAlgorithm : public G4VHadDecayAlgorithm {
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public:
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G4CascadeFinalStateAlgorithm();
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virtual ~G4CascadeFinalStateAlgorithm();
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virtual void SetVerboseLevel(G4int verbose); // Pass through to factories
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// Select appropriate distributions based on interaction
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void Configure(G4InuclElementaryParticle* bullet,
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G4InuclElementaryParticle* target,
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const std::vector<G4int>& particle_kinds);
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protected:
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// Two-body generation uses angular-distribution function
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virtual void GenerateTwoBody(G4double initialMass,
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const std::vector<G4double>& masses,
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std::vector<G4LorentzVector>& finalState);
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// N-body generation uses momentum-modulus distribution, computed angles
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virtual void GenerateMultiBody(G4double initialMass,
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const std::vector<G4double>& masses,
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std::vector<G4LorentzVector>& finalState);
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// Compute kinematic quantities needed for distributions
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void SaveKinematics(G4InuclElementaryParticle* bullet,
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G4InuclElementaryParticle* target);
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// Select generator based on initial and final state
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void ChooseGenerators(G4int is, G4int fs);
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// Generate momentum magnitudes and validate for use
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void FillMagnitudes(G4double initialMass,
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const std::vector<G4double>& masses);
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G4bool satisfyTriangle(const std::vector<G4double>& pmod) const;
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// Generate momentum directions into final state
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void FillDirections(G4double initialMass,
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const std::vector<G4double>& masses,
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std::vector<G4LorentzVector>& finalState);
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void FillDirThreeBody(G4double initialMass,
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const std::vector<G4double>& masses,
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std::vector<G4LorentzVector>& finalState);
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void FillDirManyBody(G4double initialMass,
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const std::vector<G4double>& masses,
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std::vector<G4LorentzVector>& finalState);
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G4double GenerateCosTheta(G4int ptype, G4double pmod) const;
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// SPECIAL: Generate N-body phase space using Kopylov algorithm
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void FillUsingKopylov(G4double initialMass,
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const std::vector<G4double>& masses,
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std::vector<G4LorentzVector>& finalState);
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G4double BetaKopylov(G4int K) const; // Copied from G4HadPhaseSpaceKopylov
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private:
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const G4VMultiBodyMomDst* momDist; // Buffers for selected distributions
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const G4VTwoBodyAngDst* angDist; // Will be NULL for 3+body channels
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std::vector<G4int> kinds; // Copy of particle_kinds list
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G4int multiplicity; // Final state size, for convenience
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G4double bullet_ekin; // Kinematics needed for distributions
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G4LorentzConvertor toSCM; // Handles complex rotations/transforms
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std::vector<G4double> modules; // Buffers for generating momenta
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G4ThreeVector mom;
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static const G4double maxCosTheta; // Cut for valid polar angle generation
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static const G4double oneOverE; // Numeric value of 1/e for calculations
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static const G4double small; // Cut for momentum/kinematics
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static const G4int itry_max; // Maximum number of generation attempts
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};
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#endif /* G4CascadeFinalStateAlgorithm_hh */
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