Gabriele Cosmo
107 lines
4.5 KiB
C++
107 lines
4.5 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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//
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// Multibody "phase space" generator, which provides interface to
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// algorithms for sampling. Momentum vectors are generated in the
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// center-of-mass frame of the decay, and returned in a user-supplied
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// buffer.
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//
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// Sampling algorithm is specified via constructor argument, either by
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// code for centrally supplied algorithms (Kopylov, GENBOD, or NBody),
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// or by pointer (which is owned by the generator).
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//
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// Author: Michael Kelsey (SLAC) <kelsey@slac.stanford.edu>
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#ifndef G4HadDecayGenerator_HH
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#define G4HadDecayGenerator_HH 1
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#include "globals.hh"
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#include "G4LorentzVector.hh"
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#include <vector>
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class G4ParticleDefinition;
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class G4VHadDecayAlgorithm;
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class G4HadDecayGenerator {
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public:
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// Flags to select algorithm by code in constructor
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enum Algorithm { NONE=0, Kopylov=1, GENBOD=2, NBody=3 };
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// Specify "standard" algorithm by code or by object (takes ownership)
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G4HadDecayGenerator(Algorithm alg=Kopylov, G4int verbose=0);
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G4HadDecayGenerator(G4VHadDecayAlgorithm* alg, G4int verbose=0);
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virtual ~G4HadDecayGenerator();
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// Enable (or disable if 0) diagnostic messages
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void SetVerboseLevel(G4int verbose);
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const G4String& GetAlgorithmName() const;
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// Initial state (rest mass) and list of final masses
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G4bool Generate(G4double initialMass,
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const std::vector<G4double>& masses,
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std::vector<G4LorentzVector>& finalState);
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// Initial state particle and list of final masses
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G4bool Generate(const G4ParticleDefinition* initialPD,
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const std::vector<G4double>& masses,
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std::vector<G4LorentzVector>& finalState);
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// Initial state (frame) and list of final masses
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// Final state particles will be boosted to initial-state frame
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G4bool Generate(const G4LorentzVector& initialState,
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const std::vector<G4double>& masses,
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std::vector<G4LorentzVector>& finalState);
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protected:
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// Special case for one-body final state
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G4bool GenerateOneBody(G4double initialMass,
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const std::vector<G4double>& masses,
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std::vector<G4LorentzVector>& finalState) const;
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// Special function used by constructor for unrecognized algorithm code
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void ReportInvalidAlgorithm(Algorithm alg) const;
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void ReportMissingAlgorithm() const;
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protected:
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// SPECIAL FUNCTION FOR SUBCLASSES: A subclass may implement a
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// collection of algorithms, to be switched on an event-by-event
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// basis. This function allows the subclass to switch the "active"
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// algorithm before Generate() is called.
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//
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// If this function is used by the subclass, then the subclass has
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// ownership of _all_ instantiated algorithms, and should delete
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// them in its own dtor. The subclass dtor must also call
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// UseAlgorithm(0) to set the base algorithm to a null pointer, to
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// prevent a double-delete error.
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void UseAlgorithm(G4VHadDecayAlgorithm* alg) { theAlgorithm = alg; }
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G4int verboseLevel;
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G4VHadDecayAlgorithm* theAlgorithm;
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};
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#endif /* G4HadDecayGenerator_HH */
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