/* $Id$ */
+//_________________________________________________________________
+///////////////////////////////////////////////////////////////////////
+//
+// class AliHBTLLWeights
+//
// This class introduces the weight's calculation
// according to the Lednicky's algorithm.
// The detailed description of the algorithm can be found
// in comments to fortran code:
// fsiw.f, fsiini.f
+//
+// Source simulation: Particle position/distance randomization
+// This class has functionality of randomizing particle positions / pair distances
+// so obtained correlation function follows a given shape,
+// depending on a value of fRandomPosition member
+// By default this feature is switched off: fRandomPosition == AliHBTLLWeights::kNone
+// It can be: kGaussianQInv - so 1D Qinv correlation function has a Gaussian shape
+// (and also Qlong and Qside, but not Qout)
+// kGaussianOSL - so 3D Qout-Qside-Qlong correlation function has a Gaussian shape
+//
+// Ludmila Malinina, Piotr Krzysztof Skowronski
+//
+///////////////////////////////////////////////////////////////////////
#ifndef ALIHBTLLWEIGHTS_H
#define ALIHBTLLWEIGHTS_H
-#include <TObject.h>
+#include "AliHBTWeights.h"
class AliHBTPair;
-class AliHBTLLWeights: public TObject
+class AliVAODParticle;
+class AliHBTLLWeights: public AliHBTWeights
{
public:
+ AliHBTLLWeights();
virtual ~AliHBTLLWeights(){;}
static AliHBTLLWeights* Instance();
- Double_t GetWeight(const AliHBTPair* partpair); //get weight calculated by Lednicky's algorithm
+ void Set();
+
+ Double_t GetWeight(AliHBTPair* partpair); //get weight calculated by Lednicky's algorithm
void Init(); //put the initial values in fortran commons fsiini, led_bldata
void SetTest(Bool_t rtest = kTRUE);//Sets fTest member
void SetQuantumStatistics(Bool_t qss = kTRUE);//IQS: quantum statistics for the two particles ON (OFF) //if non-identical particles automatically off
void SetStrongInterSwitch(Bool_t sis = kTRUE);//ISI: strong interaction between the two particles ON (OFF)
void SetColWithResidNuclSwitch(Bool_t crn = kTRUE);//I3C: Coulomb interaction with residual nucleus ON (OFF)
+ void SetLambda(Double_t la){fOneMinusLambda=1.-la;} //lambda=haoticity
void SetApproxModel(Int_t ap);//sets Model of Approximation (NS in Fortran code)
- void SetRandomPosition(Bool_t rp = kTRUE); //ON=kTRUE(OFF=kFALSE)
- void SetR1dw(Double_t R); //spherical source model radii
void SetParticlesTypes(Int_t pid1, Int_t pid2); //set AliRoot particles types
void SetNucleusCharge(Double_t ch); // not used now (see comments in fortran code)
void SetNucleusMass(Double_t mass); // (see comments in fortran code)
+
+ enum ERandomizationWay {kNone = 0, kGaussianQInv, kGaussianOSL};
+ void SetRandomPosition(ERandomizationWay rw = kNone); //Choose if, and if yes, how to randomize distance between particles
+ void SetR1dw(Double_t R); //spherical source model radii
+
protected:
Bool_t fTest; //flag indicating if parameters listed below are to be calculated automatically (0)
//or
- Bool_t fColoumbSwitch;
- Bool_t fQuantStatSwitch;
+ Bool_t fColoumbSwitch; //switches on/off Coulumb effect
+ Bool_t fQuantStatSwitch; //switches on/off Quantum Statistics effect
Bool_t fStrongInterSwitch;//Switches strong interactions TRUE=ON
Bool_t fColWithResidNuclSwitch;//Switches couloumb interaction
//with residual nucleus TRUE=ON
Double_t fNuclMass; //mass of nucleus
Double_t fNuclCharge; //charge of nucleus
- Bool_t fRandomPosition;//flag indicating if positions of particles shuold be randomized according to parameters below
+ ERandomizationWay fRandomPosition;//flag indicating if positions of particles shuold be randomized according to parameters below
Double_t fRadius; //radius used for randomizing particle vertex position
-
+
+ Double_t fOneMinusLambda; //1 - intercept parameter
Int_t fApproximationModel; //approximation used to calculate Bethe-Salpeter amplitude see SetApproxModel for more comments
- Int_t fPID1;
- Int_t fPID2;
+ Int_t fPID1; //Pdg Code of the first particle in the pair
+ Int_t fPID2; //Pdg Code of the second particle in the pair
Double_t fSigma; //constants for spherical source model in cm
static const Double_t fgkWcons; //constant for fm->GeV conversion 1/0.1973
static Int_t GetPairCode(const AliHBTPair* partpair);//calculate automatically internal code
private:
- AliHBTLLWeights();
- ClassDef(AliHBTLLWeights,1)
+ AliHBTLLWeights(const AliHBTLLWeights &/*source*/);
+ AliHBTLLWeights & operator=(const AliHBTLLWeights& /*source*/);
+
+ Int_t SetMomentaInLCMS(AliVAODParticle* part1, AliVAODParticle* part2);
+ void RandomPairDistances();
+
+
+ void Rotate(Double_t x, Double_t y, Double_t sphi, Double_t cphi, Double_t& xr, Double_t& yr);
+ void Boost (Double_t z, Double_t t, Double_t beta, Double_t gamma, Double_t& zt, Double_t& yt);
+ ClassDef(AliHBTLLWeights,2)
};
#endif
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff