Gabriele Cosmo
90 lines
3.8 KiB
C++
90 lines
3.8 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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// Abstract base class for multibody "phase space" generators. Subclasses
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// implement a specific algorithm, such as Kopylov, GENBOD, or Makoto's
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// NBody. Subclasses are used by G4HadPhaseSpaceGenerator.
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//
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// Author: Michael Kelsey (SLAC) <kelsey@slac.stanford.edu>
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#ifndef G4VHadDecayAlgorithm_HH
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#define G4VHadDecayAlgorithm_HH 1
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#include "globals.hh"
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#include "G4LorentzVector.hh"
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#include "G4ThreeVector.hh"
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#include <vector>
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#include <iosfwd>
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class G4VHadDecayAlgorithm {
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public:
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G4VHadDecayAlgorithm(const G4String& algName, G4int verbose=0)
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: name(algName), verboseLevel(verbose) {;}
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virtual ~G4VHadDecayAlgorithm() {;}
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// Initial state (rest mass) and list of final masses
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void Generate(G4double initialMass,
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const std::vector<G4double>& masses,
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std::vector<G4LorentzVector>& finalState);
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// Enable (or disable if 0) diagnostic messages (subclass may overload)
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virtual void SetVerboseLevel(G4int verbose) { verboseLevel = verbose; }
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G4int GetVerboseLevel() const { return verboseLevel; }
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const G4String& GetName() const { return name; }
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protected:
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// Subclasses MUST implement these functions
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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) = 0;
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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) = 0;
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// Validate kinematics (e.g., limit number of final state particles)
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// Subclasses may override or call back to this function
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virtual G4bool IsDecayAllowed(G4double initialMass,
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const std::vector<G4double>& masses) const;
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// Two-body momentum function (c.f. PDK from CERNLIB W505)
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G4double TwoBodyMomentum(G4double M0, G4double M1, G4double M2) const;
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// Convenience functions for uniform angular distributions
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G4double UniformTheta() const;
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G4double UniformPhi() const;
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// Utility to dump vector contents to line of output
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void PrintVector(const std::vector<G4double>& v, const G4String& name,
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std::ostream& os) const;
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private:
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G4String name;
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G4int verboseLevel;
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};
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#endif /* G4VHadDecayAlgorithm_HH */
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