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G4VHadPhaseSpaceAlgorithm.cc
Go to the documentation of this file.
Or view
the newest version in sPHENIX GitHub for file G4VHadPhaseSpaceAlgorithm.cc
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//
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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 uniform phase space generators.
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// Subclasses implement a specific algorithm, such as Kopylov, GENBOD,
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// or Makoto's NBody. Subclasses are used by G4HadDecayGenerator.
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//
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// Author: Michael Kelsey (SLAC) <kelsey@slac.stanford.edu>
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#include "
G4VHadPhaseSpaceAlgorithm.hh
"
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#include "
G4HadronicException.hh
"
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#include "
G4PhysicalConstants.hh
"
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#include "
G4SystemOfUnits.hh
"
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#include "
G4ThreeVector.hh
"
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#include "
Randomize.hh
"
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#include <algorithm>
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#include <iostream>
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#include <iterator>
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#include <numeric>
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#include <vector>
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// Two body decay with uniform angular distribution
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void
G4VHadPhaseSpaceAlgorithm::
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GenerateTwoBody
(
G4double
initialMass,
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const
std::vector<G4double>& masses,
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std::vector<G4LorentzVector>& finalState) {
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if
(
GetVerboseLevel
()>1)
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G4cout
<<
" >>> G4HadDecayGenerator::FillTwoBody"
<<
G4endl
;
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// Initialization and sanity check
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finalState.clear();
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if
(masses.size() != 2U)
return
;
// Should not have been called
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// Momentum of final state (energy balance has already been checked)
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G4double
p
=
TwoBodyMomentum
(initialMass,masses[0],masses[1]);
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if
(
GetVerboseLevel
()>2)
G4cout
<<
" finalState momentum = "
<< p <<
G4endl
;
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finalState.resize(2);
// Allows filling by index
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finalState[0].setVectM(
UniformVector
(p), masses[0]);
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finalState[1].setVectM(-finalState[0].vect(), masses[1]);
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}
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// Samples a random vector with given magnitude
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G4ThreeVector
G4VHadPhaseSpaceAlgorithm::UniformVector
(
G4double
mag)
const
{
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// FIXME: Should this be made a static thread-local buffer?
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G4ThreeVector
v
;
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v.
setRThetaPhi
(mag,
UniformTheta
(),
UniformPhi
());
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return
v
;
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}
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geant4-10.6-release
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G4VHadPhaseSpaceAlgorithm.cc
Built by
Jin Huang
. updated:
Wed Jun 29 2022 17:25:51
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