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G4CrossSectionBuffer.hh
Go to the documentation of this file.
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the newest version in sPHENIX GitHub for file G4CrossSectionBuffer.hh
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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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#ifndef G4CrossSectionBuffer_h
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#define G4CrossSectionBuffer_h
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#include <utility>
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#include <vector>
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#include <
CLHEP/Units/SystemOfUnits.h
>
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#include "
globals.hh
"
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#include "
G4ParticleDefinition.hh
"
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#include "
G4KineticTrack.hh
"
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class
G4CrossSectionBuffer
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{
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public
:
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G4CrossSectionBuffer
(
const
G4ParticleDefinition
* aA,
const
G4ParticleDefinition
* aB)
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:
theA
(aA),
theB
(aB) {}
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G4bool
InCharge
(
const
G4ParticleDefinition
* aA,
const
G4ParticleDefinition
* aB)
const
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{
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G4bool
result =
false
;
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if
(aA ==
theA
)
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{
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if
(aB ==
theB
) result =
true
;
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}
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else
if
(aA ==
theB
)
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{
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if
(aB ==
theA
) result =
true
;
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}
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return
result;
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}
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void
push_back
(
G4double
S
,
G4double
x
)
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{
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std::pair<G4double, G4double> aNew;
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aNew.first =
S
;
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aNew.second =
x
;
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theData
.push_back(aNew);
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}
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G4double
CrossSection
(
const
G4KineticTrack
& trk1,
const
G4KineticTrack
& trk2)
const
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{
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G4double
sqrts = (trk1.
Get4Momentum
()+trk2.
Get4Momentum
()).mag();
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G4double
x1
(1),
y1
(0);
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G4double
x2
(2),
y2
(0);
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if
(
theData
.size()==1)
return
theData
[
theData
.size()-1].second;
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for
(
size_t
i=0; i<
theData
.size(); i++)
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{
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if
(
theData
[i].first>sqrts)
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{
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if
(0==i)
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{
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x1
=
theData
[i].first;
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y1 =
theData
[i].second;
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x2
=
theData
[i+1].first;
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y2 =
theData
[i+1].second;
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}
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else
if
(
theData
.size()-1==i)
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{
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x1
=
theData
[
theData
.size()-2].first;
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y1 =
theData
[
theData
.size()-2].second;
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x2
=
theData
[
theData
.size()-1].first;
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y2 =
theData
[
theData
.size()-1].second;
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}
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else
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{
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x1
=
theData
[i-1].first;
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y1 =
theData
[i-1].second;
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x2
=
theData
[i].first;
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y2 =
theData
[i].second;
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}
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break
;
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}
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}
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// LINLIN interpolation
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// G4cerr << "!!!!!! "<<sqrts<<" "<<x1<<" "<<x2<<" "<<y1<<" "<<y2<<" "<<i<<G4endl;
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G4double
result = y1 + (sqrts-
x1
) * (y2-y1)/(
x2
-
x1
);
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if
(result<0) result = 0;
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if
(y1<0.01*
CLHEP::millibarn
) result = 0;
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return
result;
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}
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void
Print
()
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{
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for
(
size_t
i=0;i<
theData
.size(); i++)
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{
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G4cerr
<<
"sqrts = "
<<
theData
[i].first<<
", X = "
<<
theData
[i].second/
CLHEP::millibarn
<<
G4endl
;
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}
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}
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private
:
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std::vector<std::pair<G4double, G4double> >
theData
;
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const
G4ParticleDefinition
*
theA
;
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const
G4ParticleDefinition
*
theB
;
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};
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#endif
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geant4-10.6-release
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include
G4CrossSectionBuffer.hh
Built by
Jin Huang
. updated:
Wed Jun 29 2022 17:25:43
using
1.8.2 with
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