* See cxx source for full Copyright notice */
/* $Id$ */
-//
+
// Utility class to make simple Glauber type calculations for collision geometries:
// Impact parameter, production points, reaction plane dependence
-//
-// Author: andreas.morsch@cern.ch
+// Author: Andreas Morsch
+// andreas.morsch@cern.ch
#include <TObject.h>
#include <TString.h>
-#include <TF2.h>
class TF1;
+class TF2;
+
class AliFastGlauber : public TObject {
public:
- AliFastGlauber();
+ static AliFastGlauber* Instance();
virtual ~AliFastGlauber();
void Init(Int_t mode = 0);
void SetWoodSaxonParametersAu()
{fWSr0 = 6.38; fWSd = 0.535; fWSw = 0.; fWSn = 8.59e-4;}
void SetWoodSaxonParametersPb()
- {fWSr0 = 6.624; fWSd = 0.549; fWSw = 0.; fWSn = 7.69e-4;}
+ {fWSr0 = 6.78; fWSd = 0.54; fWSw = 0.; fWSn = 7.14e-4;}
void SetMaxImpact(Float_t bmax = 20.) {fgBMax = bmax;};
void SetHardCrossSection(Float_t xs = 1.0) {fSigmaHard = xs;}
void SetNNCrossSection (Float_t xs = 55.6) {fSigmaNN = xs;}
void SetNucleus(Int_t n=208) {fA=n;}
void SetAuAuRhic();
void SetPbPbLHC();
- void SetFileName(TString &fn){fName=fn;}
- void SetFileName(Char_t *fn="$(ALICE_ROOT)/FASTSIM/data/glauberPbPb.root"){fName=fn;}
-
- static Double_t WSb (Double_t *xx, Double_t *par);
- static Double_t WSbz (Double_t *xx, Double_t *par);
- static Double_t WSz (Double_t *xx, Double_t *par);
- static Double_t WSta (Double_t *xx, Double_t *par);
- static Double_t WStarfi (Double_t *xx, Double_t *par);
- static Double_t WStaa (Double_t *xx, Double_t *par);
- static Double_t WKParticipants (Double_t *xx, Double_t *par);
- static Double_t WParticipants (Double_t *xx, Double_t *par);
- static Double_t WSgeo (Double_t *xx, Double_t *par);
- static Double_t WSbinary (Double_t *xx, Double_t *par);
- static Double_t WSN (Double_t *xx, Double_t *par);
- static Double_t WAlmond (Double_t *xx, Double_t *par);
- static Double_t WPathLength0 (Double_t *xx, Double_t *par);
- static Double_t WPathLength (Double_t *xx, Double_t *par);
- static Double_t WIntRadius (Double_t *xx, Double_t *par);
- static Double_t WEnergyDensity (Double_t *xx, Double_t *par);
+ void SetFileName(const TString &fn){fName=fn;}
+ void SetFileName(const char *fn="$(ALICE_ROOT)/FASTSIM/data/glauberPbPb.root"){fName=fn;}
const TF1* GetWSB() const {return fgWSb;}
+ const TF1* GetRWSB() const {return fgRWSb;}
const TF2* GetWSbz() const {return fgWSbz;}
const TF1* GetWSz() const {return fgWSz;}
const TF1* GetWSta() const {return fgWSta;}
const TF1* GetWSbinary() const {return fgWSbinary;}
const TF1* GetWSN() const {return fgWSN;}
const TF1* GetWEnergyDensity() const {return fgWEnergyDensity;}
- const TF2* GetWAlmondFixedB(Int_t i) const {return &fgWAlmondFixedB[i];}
+ const TF2* GetWAlmondFixedB(Int_t i) const {return fgWAlmondFixedB[i];}
Float_t GetWr0() const {return fWSr0;}
Float_t GetWSd() const {return fWSd;}
Double_t GetNumberOfParticipants(Double_t b) const;
Double_t GetNumberOfCollisions(Double_t b) const;
Double_t GetNumberOfCollisionsPerEvent(Double_t b) const;
+ Double_t MeanOverlap(Double_t b1, Double_t b2);
+ Double_t MeanNumberOfCollisionsPerEvent(Double_t b1, Double_t b2);
void SimulateTrigger(Int_t n);
void GetRandom(Float_t& b, Float_t& p, Float_t& mult);
void GetRandom(Int_t& bin, Bool_t& hard);
void SetCentralityClass(Double_t xsecFrLow=0.0,Double_t xsecFrUp=0.1);
void GetRandomBHard(Double_t& b);
void GetRandomXY(Double_t& x,Double_t& y);
+ void GetSavedXY(Double_t xy[2]) const {xy[0] = fXY[0]; xy[1] = fXY[1];}
+ void GetSavedI0I1(Double_t i0i1[2]) const {i0i1[0] = fI0I1[0]; i0i1[1] = fI0I1[1];}
+ void SaveXY(Double_t x, Double_t y) {fXY[0] = x; fXY[1] = y;}
+ void SaveI0I1(Double_t i0, Double_t i1) {fI0I1[0] = i0; fI0I1[1] = i1;}
+
void GetRandomPhi(Double_t& phi);
Double_t CalculateLength(Double_t b=0.,Double_t x0=0.,Double_t y0=0.,
Double_t phi0=0.);
Double_t b=-1.);
void GetLengthsBackToBack(Double_t& ell1,Double_t& ell2,
Double_t b=-1.);
- void GetLengthsForPythia(Int_t n,Double_t* phi,Double_t* ell,
+ void GetLengthsForPythia(Int_t n,Double_t* const phi,Double_t* ell,
Double_t b=-1.);
void PlotBDistr(Int_t n=1000);
void PlotLengthDistr(Int_t n=1000,Bool_t save=kFALSE,
- Char_t *fname="length.root");
+ const char *fname="length.root");
void PlotLengthB2BDistr(Int_t n=1000,Bool_t save=kFALSE,
- Char_t *fname="lengthB2B.root");
+ const char *fname="lengthB2B.root");
void CalculateI0I1(Double_t& integral0,Double_t& integral1,
Double_t b=0.,
Double_t x0=0.,Double_t y0=0.,Double_t phi0=0.,
Double_t&x, Double_t &y,
Double_t ellCut=20.,Double_t b=-1.);
void PlotI0I1Distr(Int_t n=1000,Double_t ellCut=20.,Bool_t save=kFALSE,
- Char_t *fname="i0i1.root");
+ const char *fname="i0i1.root");
void PlotI0I1B2BDistr(Int_t n=1000,Double_t ellCut=20.,Bool_t save=kFALSE,
- Char_t *fname="i0i1B2B.root");
+ const char *fname="i0i1B2B.root");
void PlotAlmonds() const;
+ // Copy
+ AliFastGlauber& operator=(const AliFastGlauber & rhs);
+ void Copy(TObject&) const;
protected:
- void Reset();
+ static Double_t RWSb (const Double_t *xx, const Double_t *par);
+ static Double_t WSb (const Double_t *xx, const Double_t *par);
+ static Double_t WSbz (const Double_t *xx, const Double_t *par);
+ static Double_t WSz (const Double_t *xx, const Double_t *par);
+ static Double_t WSta (const Double_t *xx, const Double_t *par);
+ static Double_t WStarfi (const Double_t *xx, const Double_t *par);
+ static Double_t WStaa (const Double_t *xx, const Double_t *par);
+ static Double_t WKParticipants (const Double_t *xx, const Double_t *par);
+ static Double_t WParticipants (const Double_t *xx, const Double_t *par);
+ static Double_t WSgeo (const Double_t *xx, const Double_t *par);
+ static Double_t WSbinary (const Double_t *xx, const Double_t *par);
+ static Double_t WSN (const Double_t *xx, const Double_t *par);
+ static Double_t WAlmond (const Double_t *xx, const Double_t *par);
+ static Double_t WPathLength0 (const Double_t *xx, const Double_t *par);
+ static Double_t WPathLength (const Double_t *xx, const Double_t *par);
+ static Double_t WIntRadius (const Double_t *xx, const Double_t *par);
+ static Double_t WEnergyDensity (const Double_t *xx, const Double_t *par);
- static Float_t fgBMax; // Maximum Impact Parameter
- static Int_t fgCounter; // Counter to protect double instantiation
- static const Int_t fgkMCInts; // Number of MC integrations
+ void Reset() const;
+ private:
+ AliFastGlauber();
+ AliFastGlauber(const AliFastGlauber& glauber);
+ static Float_t fgBMax; // Maximum Impact Parameter
+ static const Int_t fgkMCInts; // Number of MC integrations
+ static AliFastGlauber* fgGlauber; // Singleton instance
+
+
static TF1* fgWSb; // Wood-Saxon Function (b)
+ static TF1* fgRWSb; // Wood-Saxon Function (b) with phase space factor
static TF2* fgWSbz; // Wood-Saxon Function (b, z)
static TF1* fgWSz; // Wood-Saxon Function (b = b0, z)
static TF1* fgWSta; // Thickness Function
static TF1* fgWSbinary; // dSigma/db binary
static TF1* fgWSN; // dN/db binary
static TF1* fgWEnergyDensity; // Energy density as a function of impact parameter
- static TF2 fgWAlmondFixedB[40]; // Interaction Almonds read from file
+ static TF2* fgWAlmondFixedB[40]; // Interaction Almonds read from file
static TF2* fgWAlmondCurrent; // Interaction Almond used for length
Float_t fWSr0; // Wood-Saxon Parameter r0
Float_t fBmin; // Minimum b (set through centrality selection)
Float_t fBmax; // Coresponding maximum b
-
+ Double_t fXY[2]; // Current generated production point
+ Double_t fI0I1[2]; // Current integrals I0 and I1
Int_t fEllDef; // definition of length (see CalculateLength())
- TString fName; // filename of stored distributions
- ClassDef(AliFastGlauber,1) // Event geometry simulation in the Glauber Model
+ TString fName; // filename of stored distributions
+ ClassDef(AliFastGlauber,2) // Event geometry simulation in the Glauber Model
};
#endif
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff