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This commit is contained in:
Gabriele Cosmo
2016-06-09 15:16:48 +02:00
parent 75c7fd177d
commit a8e9364cea
6592 changed files with 84274 additions and 69292 deletions
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source/processes/hadronic/models/parton_string/diffraction/src/G4DiffractiveExcitation.cc
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//
// ********************************************************************
// * License and Disclaimer *
// * *
// * The Geant4 software is copyright of the Copyright Holders of *
// * the Geant4 Collaboration. It is provided under the terms and *
// * conditions of the Geant4 Software License, included in the file *
// * LICENSE and available at http://cern.ch/geant4/license . These *
// * include a list of copyright holders. *
// * *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work make any representation or warranty, express or implied, *
// * regarding this software system or assume any liability for its *
// * use. Please see the license in the file LICENSE and URL above *
// * for the full disclaimer and the limitation of liability. *
// * *
// * This code implementation is the result of the scientific and *
// * technical work of the GEANT4 collaboration. *
// * By using, copying, modifying or distributing the software (or *
// * any work based on the software) you agree to acknowledge its *
// * use in resulting scientific publications, and indicate your *
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
//
// $Id: G4DiffractiveExcitation.cc,v 1.1 2007/05/25 06:56:53 vuzhinsk Exp $
// ------------------------------------------------------------
// GEANT 4 class implemetation file
//
// ---------------- G4DiffractiveExcitation --------------
// by Gunter Folger, October 1998.
// diffractive Excitation used by strings models
// Take a projectile and a target
// excite the projectile and target
// Essential changed by V. Uzhinsky in November - December 2006
// in order to put it in a correspondence with original FRITIOF
// model. Variant of FRITIOF with nucleon de-excitation is implemented.
// Other changes by V.Uzhinsky in May 2007 were introduced to fit
// meson-nucleon interactions
// ---------------------------------------------------------------------
#include "globals.hh"
#include "Randomize.hh"
#include "G4DiffractiveExcitation.hh"
#include "G4LorentzRotation.hh"
#include "G4ThreeVector.hh"
#include "G4ParticleDefinition.hh"
#include "G4VSplitableHadron.hh"
#include "G4ExcitedString.hh"
//#include "G4ios.hh"
G4DiffractiveExcitation::G4DiffractiveExcitation() // Uzhi
{
}
G4bool G4DiffractiveExcitation::
ExciteParticipants(G4VSplitableHadron *projectile, G4VSplitableHadron *target) const
{
G4LorentzVector Pprojectile=projectile->Get4Momentum();
// -------------------- Projectile parameters -----------------------------------
G4bool PutOnMassShell=0;
// With de-excitation
// G4double M0projectile=projectile->GetDefinition()->GetPDGMass();
// Without de-excitation
G4double M0projectile = Pprojectile.mag();
if(M0projectile < projectile->GetDefinition()->GetPDGMass())
{
PutOnMassShell=1;
M0projectile=projectile->GetDefinition()->GetPDGMass();
}
G4double Mprojectile2 = M0projectile * M0projectile;
G4int PDGcode=projectile->GetDefinition()->GetPDGEncoding();
G4int absPDGcode=std::abs(PDGcode);
G4double ProjectileDiffCut;
G4double ProjectileBackgroundWeight; // Uzhi May 2007
G4double TargetBackgroundWeight; // Uzhi May 2007
G4double AveragePt2;
if( absPDGcode > 1000 ) //------Projectile is baryon --------
{
ProjectileDiffCut = 1.1; // GeV
ProjectileBackgroundWeight=0.; // Uzhi May 2007
AveragePt2 = 0.3; // GeV^2
}
else if( absPDGcode == 211 || PDGcode == 111) //------Projectile is Pion -----------
{
ProjectileDiffCut = 0.6; // GeV Uzhi May 2007 1.0->0.6
ProjectileBackgroundWeight=0.9; // Uzhi May 2007
AveragePt2 = 0.3; // GeV^2
}
else if( absPDGcode == 321 || PDGcode == -311) //------Projectile is Kaon -----------
{
ProjectileDiffCut = 0.7; // GeV 1.1
ProjectileBackgroundWeight=0.5; // Uzhi May 2007 ???
AveragePt2 = 0.3; // GeV^2
}
else //------Projectile is undefined,
//------Nucleon assumed
{
ProjectileDiffCut = 1.1; // GeV
ProjectileBackgroundWeight=0.; // Uzhi May 2007
AveragePt2 = 0.3; // GeV^2
};
ProjectileDiffCut = ProjectileDiffCut * GeV;
AveragePt2 = AveragePt2 * GeV*GeV;
// -------------------- Target parameters ----------------------------------------------
G4LorentzVector Ptarget=target->Get4Momentum();
G4double M0target = Ptarget.mag();
if(M0target < target->GetDefinition()->GetPDGMass())
{
PutOnMassShell=1;
M0target=target->GetDefinition()->GetPDGMass();
}
G4double Mtarget2 = M0target * M0target; //Ptarget.mag2();
// for AA-inter.
G4double NuclearNucleonDiffCut = 1.1*GeV;
TargetBackgroundWeight=0.; // Uzhi May 2007
G4double ProjectileDiffCut2 = ProjectileDiffCut * ProjectileDiffCut;
G4double NuclearNucleonDiffCut2 = NuclearNucleonDiffCut * NuclearNucleonDiffCut;
// Transform momenta to cms and then rotate parallel to z axis;
G4LorentzVector Psum;
Psum=Pprojectile+Ptarget;
G4LorentzRotation toCms(-1*Psum.boostVector());
G4LorentzVector Ptmp=toCms*Pprojectile;
if ( Ptmp.pz() <= 0. )
{
// "String" moving backwards in CMS, abort collision !!
//G4cout << " abort Collision!! " << G4endl;
return false;
}
toCms.rotateZ(-1*Ptmp.phi());
toCms.rotateY(-1*Ptmp.theta());
G4LorentzRotation toLab(toCms.inverse());
Pprojectile.transform(toCms);
Ptarget.transform(toCms);
G4double Pt2;
G4double ProjMassT2, ProjMassT;
G4double TargMassT2, TargMassT;
G4double PZcms2, PZcms;
G4double PMinusNew, TPlusNew;
G4double S=Psum.mag2();
G4double SqrtS=std::sqrt(S);
if(absPDGcode > 1000 && SqrtS < 2200*MeV)
{return false;} // The model cannot work for
// p+p-interactions
// at Plab < 1.3 GeV/c.
if(( absPDGcode == 211 || PDGcode == 111) && SqrtS < 1600*MeV)
{return false;} // The model cannot work for
// Pi+p-interactions
// at Plab < 1. GeV/c.
if(( absPDGcode == 321 || PDGcode == -311) && SqrtS < 1600*MeV)
{return false;} // The model cannot work for
// K+p-interactions
// at Plab < ??? GeV/c. ???
PZcms2=(S*S+Mprojectile2*Mprojectile2+Mtarget2*Mtarget2-
2*S*Mprojectile2-2*S*Mtarget2-2*Mprojectile2*Mtarget2)/4./S;
if(PZcms2 < 0)
{return false;} // It can be in an interaction with off-shell nuclear nucleon
PZcms = std::sqrt(PZcms2);
if(PutOnMassShell)
{
if(Pprojectile.z() > 0.)
{
Pprojectile.setPz( PZcms);
Ptarget.setPz( -PZcms);
}
else
{
Pprojectile.setPz(-PZcms);
Ptarget.setPz( PZcms);
};
Pprojectile.setE(std::sqrt(Mprojectile2+
Pprojectile.x()*Pprojectile.x()+
Pprojectile.y()*Pprojectile.y()+
PZcms2));
Ptarget.setE(std::sqrt( Mtarget2 +
Ptarget.x()*Ptarget.x()+
Ptarget.y()*Ptarget.y()+
PZcms2));
}
G4double maxPtSquare = PZcms2;
//G4cout << "Pprojectile aft boost : " << Pprojectile << G4endl;
//G4cout << "Ptarget aft boost : " << Ptarget << G4endl;
// G4cout << "cms aft boost : " << (Pprojectile+ Ptarget) << G4endl;
// G4cout << " Projectile Xplus / Xminus : " <<
// Pprojectile.plus() << " / " << Pprojectile.minus() << G4endl;
// G4cout << " Target Xplus / Xminus : " <<
// Ptarget.plus() << " / " << Ptarget.minus() << G4endl;
G4LorentzVector Qmomentum;
G4double Qminus, Qplus;
G4int whilecount=0;
do {
// Generate pt
if (whilecount++ >= 500 && (whilecount%100)==0)
// G4cout << "G4DiffractiveExcitation::ExciteParticipants possibly looping"
// << ", loop count/ maxPtSquare : "
// << whilecount << " / " << maxPtSquare << G4endl;
if (whilecount > 1000 )
{
Qmomentum=G4LorentzVector(0.,0.,0.,0.);
return false; // Ignore this interaction
}
Qmomentum=G4LorentzVector(GaussianPt(AveragePt2,maxPtSquare),0);
//G4cout << "generated Pt " << Qmomentum << G4endl;
//G4cout << "Pprojectile with pt : " << Pprojectile+Qmomentum << G4endl;
//G4cout << "Ptarget with pt : " << Ptarget-Qmomentum << G4endl;
// Momentum transfer
/* // Uzhi
G4double Xmin = minmass / ( Pprojectile.e() + Ptarget.e() );
G4double Xmax=1.;
G4double Xplus =ChooseX(Xmin,Xmax);
G4double Xminus=ChooseX(Xmin,Xmax);
// G4cout << " X-plus " << Xplus << G4endl;
// G4cout << " X-minus " << Xminus << G4endl;
G4double pt2=G4ThreeVector(Qmomentum.vect()).mag2();
G4double Qplus =-1 * pt2 / Xminus/Ptarget.minus();
G4double Qminus= pt2 / Xplus /Pprojectile.plus();
*/ // Uzhi *
Pt2=G4ThreeVector(Qmomentum.vect()).mag2();
ProjMassT2=Mprojectile2+Pt2;
ProjMassT =std::sqrt(ProjMassT2);
TargMassT2=Mtarget2+Pt2;
TargMassT =std::sqrt(TargMassT2);
PZcms2=(S*S+ProjMassT2*ProjMassT2+
TargMassT2*TargMassT2-
2.*S*ProjMassT2-2.*S*TargMassT2-
2.*ProjMassT2*TargMassT2)/4./S;
if(PZcms2 < 0 ) {PZcms2=0;};
PZcms =std::sqrt(PZcms2);
G4double PMinusMin=std::sqrt(ProjMassT2+PZcms2)-PZcms;
G4double PMinusMax=SqrtS-TargMassT;
if(G4UniformRand() < ProjectileBackgroundWeight) // Uzhi May 2007
{
PMinusNew=PMinusMax-(PMinusMax-PMinusMin)*G4UniformRand(); // Uzhi May 2007
} // Uzhi May 2007
else // Uzhi May 2007
{ // Uzhi May 2007
PMinusNew=ChooseP(PMinusMin, PMinusMax); // Uzhi May 2007
}; // Uzhi May 2007
// PMinusNew=ChooseP(PMinusMin, PMinusMax); // Uzhi May 2007
Qminus=PMinusNew-Pprojectile.minus();
G4double TPlusMin=std::sqrt(TargMassT2+PZcms2)-PZcms;
G4double TPlusMax=SqrtS-PMinusNew; // Uzhi May 2007
// G4double TPlusMax=SqrtS-ProjMassT; // Uzhi May 2007
if(G4UniformRand() < TargetBackgroundWeight) // Uzhi May 2007
{
TPlusNew=TPlusMax-(TPlusMax-TPlusMin)*G4UniformRand(); // Uzhi May 2007
} // Uzhi May 2007
else // Uzhi May 2007
{ // Uzhi May 2007
TPlusNew=ChooseP(TPlusMin, TPlusMax); // Uzhi May 2007
}; // Uzhi May 2007
// TPlusNew=ChooseP(TPlusMin, TPlusMax); // Uzhi May 2007
Qplus=-(TPlusNew-Ptarget.plus());
Qmomentum.setPz( (Qplus-Qminus)/2 );
Qmomentum.setE( (Qplus+Qminus)/2 );
//G4cout << "Qplus / Qminus " << Qplus << " / " << Qminus<<G4endl;
// G4cout << "pt2" << pt2 << G4endl;
// G4cout << "Qmomentum " << Qmomentum << G4endl;
// G4cout << " Masses (P/T) : " << (Pprojectile+Qmomentum).mag() <<
// " / " << (Ptarget-Qmomentum).mag() << G4endl;
} while (
( (Pprojectile+Qmomentum).mag2() < Mprojectile2 || // Uzhi No without excitation
(Ptarget -Qmomentum).mag2() < Mtarget2 ) || // Uzhi
( (Pprojectile+Qmomentum).mag2() < ProjectileDiffCut2 && // Uzhi No double Diffraction
(Ptarget -Qmomentum).mag2() < NuclearNucleonDiffCut2) );// Uzhi
if((Ptarget-Qmomentum).mag2() < NuclearNucleonDiffCut2) // Uzhi
//Projectile diffraction
{
G4double TMinusNew=SqrtS-PMinusNew;
Qminus=Ptarget.minus()-TMinusNew;
TPlusNew=TargMassT2/TMinusNew;
Qplus=Ptarget.plus()-TPlusNew;
Qmomentum.setPz( (Qplus-Qminus)/2 );
Qmomentum.setE( (Qplus+Qminus)/2 );
}
else if((Pprojectile+Qmomentum).mag2() < ProjectileDiffCut2) // Uzhi
//Target diffraction
{
G4double PPlusNew=SqrtS-TPlusNew;
Qplus=PPlusNew-Pprojectile.plus();
PMinusNew=ProjMassT2/PPlusNew;
Qminus=PMinusNew-Pprojectile.minus();
Qmomentum.setPz( (Qplus-Qminus)/2 );
Qmomentum.setE( (Qplus+Qminus)/2 );
};
Pprojectile += Qmomentum;
Ptarget -= Qmomentum;
/*
Pprojectile.setPz(0.);
Pprojectile.setE(SqrtS-M0target);
Ptarget.setPz(0.);
Ptarget.setE(M0target);
*/
//G4cout << "Pprojectile with Q : " << Pprojectile << G4endl;
//G4cout << "Ptarget with Q : " << Ptarget << G4endl;
// G4cout << "Projectile back: " << toLab * Pprojectile << G4endl;
// G4cout << "Target back: " << toLab * Ptarget << G4endl;
// Transform back and update SplitableHadron Participant.
Pprojectile.transform(toLab);
Ptarget.transform(toLab);
//G4cout << "Pprojectile with Q M: " << Pprojectile<<" "<< Pprojectile.mag() << G4endl;
//G4cout << "Ptarget with Q M: " << Ptarget <<" "<< Ptarget.mag() << G4endl;
//G4cout << "Target mass " << Ptarget.mag() << G4endl;
target->Set4Momentum(Ptarget);
//G4cout << "Projectile mass " << Pprojectile.mag() << G4endl;
projectile->Set4Momentum(Pprojectile);
return true;
}
G4ExcitedString * G4DiffractiveExcitation::
String(G4VSplitableHadron * hadron, G4bool isProjectile) const
{
hadron->SplitUp();
G4Parton *start= hadron->GetNextParton();
if ( start==NULL)
{ G4cout << " G4FTFModel::String() Error:No start parton found"<< G4endl;
return NULL;
}
G4Parton *end = hadron->GetNextParton();
if ( end==NULL)
{ G4cout << " G4FTFModel::String() Error:No end parton found"<< G4endl;
return NULL;
}
G4ExcitedString * string;
if ( isProjectile )
{
string= new G4ExcitedString(end,start, +1);
} else {
string= new G4ExcitedString(start,end, -1);
}
string->SetPosition(hadron->GetPosition());
// momenta of string ends
G4double ptSquared= hadron->Get4Momentum().perp2();
G4double transverseMassSquared= hadron->Get4Momentum().plus()
* hadron->Get4Momentum().minus();
G4double maxAvailMomentumSquared=
sqr( std::sqrt(transverseMassSquared) - std::sqrt(ptSquared) );
G4double widthOfPtSquare = 0.25; // Uzhi <Pt^2>=0.25 ??????????????????
G4ThreeVector pt=GaussianPt(widthOfPtSquare,maxAvailMomentumSquared);
G4LorentzVector Pstart(G4LorentzVector(pt,0.));
G4LorentzVector Pend;
Pend.setPx(hadron->Get4Momentum().px() - pt.x());
Pend.setPy(hadron->Get4Momentum().py() - pt.y());
G4double tm1=hadron->Get4Momentum().minus() +
( Pend.perp2()-Pstart.perp2() ) / hadron->Get4Momentum().plus();
G4double tm2= std::sqrt( std::max(0., sqr(tm1) -
4. * Pend.perp2() * hadron->Get4Momentum().minus()
/ hadron->Get4Momentum().plus() ));
G4int Sign= isProjectile ? -1 : 1;
G4double endMinus = 0.5 * (tm1 + Sign*tm2);
G4double startMinus= hadron->Get4Momentum().minus() - endMinus;
G4double startPlus= Pstart.perp2() / startMinus;
G4double endPlus = hadron->Get4Momentum().plus() - startPlus;
Pstart.setPz(0.5*(startPlus - startMinus));
Pstart.setE(0.5*(startPlus + startMinus));
Pend.setPz(0.5*(endPlus - endMinus));
Pend.setE(0.5*(endPlus + endMinus));
start->Set4Momentum(Pstart);
end->Set4Momentum(Pend);
#ifdef G4_FTFDEBUG
G4cout << " generated string flavors " << start->GetPDGcode() << " / " << end->GetPDGcode() << G4endl;
G4cout << " generated string momenta: quark " << start->Get4Momentum() << "mass : " <<start->Get4Momentum().mag()<< G4endl;
G4cout << " generated string momenta: Diquark " << end ->Get4Momentum() << "mass : " <<end->Get4Momentum().mag()<< G4endl;
G4cout << " sum of ends " << Pstart+Pend << G4endl;
G4cout << " Original " << hadron->Get4Momentum() << G4endl;
#endif
return string;
}
// --------- private methods ----------------------
G4double G4DiffractiveExcitation::ChooseP(G4double Pmin, G4double Pmax) const // Uzhi
{
// choose an x between Xmin and Xmax with P(x) ~ 1/x
// to be improved...
G4double range=Pmax-Pmin; // Uzhi
if ( Pmin <= 0. || range <=0. )
{
G4cout << " Pmin, range : " << Pmin << " , " << range << G4endl;
throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation::ChooseP : Invalid arguments ");
}
G4double P;
/* // Uzhi
do {
x=Xmin + G4UniformRand() * range;
} while ( Xmin/x < G4UniformRand() );
*/ // Uzhi
P=Pmin * std::pow(Pmax/Pmin,G4UniformRand()); // Uzhi
//debug-hpw cout << "DiffractiveX "<<x<<G4endl;
return P;
}
G4ThreeVector G4DiffractiveExcitation::GaussianPt(G4double AveragePt2, G4double maxPtSquare) const // Uzhi
{ // @@ this method is used in FTFModel as well. Should go somewhere common!
G4double Pt2;
/* // Uzhi
do {
pt2=widthSquare * std::log( G4UniformRand() );
} while ( pt2 > maxPtSquare);
*/ // Uzhi
Pt2 = -AveragePt2 * std::log(1. + G4UniformRand() * (std::exp(-maxPtSquare/AveragePt2)-1.));// Uzhi
G4double Pt=std::sqrt(Pt2);
G4double phi=G4UniformRand() * twopi;
return G4ThreeVector (Pt*std::cos(phi), Pt*std::sin(phi), 0.);
}
G4DiffractiveExcitation::G4DiffractiveExcitation(const G4DiffractiveExcitation &)
{
throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation copy contructor not meant to be called");
}
G4DiffractiveExcitation::~G4DiffractiveExcitation()
{
}
const G4DiffractiveExcitation & G4DiffractiveExcitation::operator=(const G4DiffractiveExcitation &)
{
throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation = operator meant to be called");
return *this;
}
int G4DiffractiveExcitation::operator==(const G4DiffractiveExcitation &) const
{
throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation == operator meant to be called");
return false;
}
int G4DiffractiveExcitation::operator!=(const G4DiffractiveExcitation &) const
{
throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation != operator meant to be called");
return true;
}
source/processes/hadronic/models/parton_string/diffraction/src/G4DiffractiveSplitableHadron.cc
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//
//
// $Id: G4DiffractiveSplitableHadron.cc,v 1.6 2006/06/29 20:54:36 gunter Exp $
// GEANT4 tag $Name: geant4-08-02 $
// GEANT4 tag $Name: geant4-09-00 $
//
// ------------------------------------------------------------
source/processes/hadronic/models/parton_string/diffraction/src/G4FTFModel.cc
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@@ -25,7 +25,7 @@
//
//
// $Id: G4FTFModel.cc,v 1.7 2007/04/24 10:32:59 gunter Exp $
// GEANT4 tag $Name: geant4-08-03 $
// GEANT4 tag $Name: geant4-09-00 $
//
// ------------------------------------------------------------
source/processes/hadronic/models/parton_string/diffraction/src/G4FTFParticipants.cc
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@@ -25,7 +25,7 @@
//
//
// $Id: G4FTFParticipants.cc,v 1.7 2007/04/24 10:33:00 gunter Exp $
// GEANT4 tag $Name: geant4-08-03 $
// GEANT4 tag $Name: geant4-09-00 $
//
// ------------------------------------------------------------
// GEANT 4 class implementation file