#ifndef ALIFASTGLAUBER_H #define ALIFASTGLAUBER_H /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * * 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 // andreas.morsch@cern.ch #include #include class TF1; class TF2; class AliFastGlauber : public TObject { public: static AliFastGlauber* Instance(); virtual ~AliFastGlauber(); void Init(Int_t mode = 0); void SetWoodSaxonParameters(Double_t r0, Double_t d, Double_t w, Double_t n) {fWSr0 = r0; fWSd = d; fWSw = w; fWSn = n;} void SetWoodSaxonParametersAu() {fWSr0 = 6.38; fWSd = 0.535; fWSw = 0.; fWSn = 8.59e-4;} void SetWoodSaxonParametersPb() {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(const char *fn="$(ALICE_ROOT)/FASTSIM/data/glauberPbPb.root"){fName=fn;} const TF1* GetWSB() const {return fgWSb;} const TF2* GetWSbz() const {return fgWSbz;} const TF1* GetWSz() const {return fgWSz;} const TF1* GetWSta() const {return fgWSta;} const TF2* Kernel() const {return fgWStarfi;} const TF2* GetWStarfi() const {return fgWStarfi;} const TF2* GetWKParticipants() const {return fgWKParticipants;} const TF1* GetWParticipants() const {return fgWParticipants;} const TF1* Overlap() const {return fgWStaa;} const TF1* GetWStaa() const {return fgWStaa;} const TF2* GetWAlmond() const {return fgWAlmond;} const TF1* GetWPathLength0() const {return fgWPathLength0;} const TF1* GetWPathLength() const {return fgWPathLength;} const TF1* GetWIntRadius() const {return fgWIntRadius;} const TF1* GetWSgeo() const {return fgWSgeo;} 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];} Float_t GetWr0() const {return fWSr0;} Float_t GetWSd() const {return fWSd;} Float_t GetWSw() const {return fWSw;} Float_t GetWSn() const {return fWSn;} Float_t GetSigmaHard() const {return fSigmaHard;} Float_t GetSigmaNN() const {return fSigmaNN;} Int_t GetA() const {return fA;} const TString* GetFileName() const {return &fName;} Float_t GetBmin() const {return fBmin;} Float_t GetBmax() const {return fBmax;} void DrawWSb() const; void DrawThickness() const; void DrawOverlap() const; void DrawParticipants() const; void DrawGeo() const; void DrawBinary() const; void DrawN() const; void DrawKernel(Double_t b = 0.) const; void DrawAlmond(Double_t b = 0.) const; void DrawPathLength0(Double_t b = 0., Int_t iopt = 0) const; void DrawPathLength(Double_t b, Int_t ni = 1000, Int_t iopt = 0) const; void DrawIntRadius(Double_t b = 0.) const; void DrawEnergyDensity() const; Double_t CrossSection(Double_t b1, Double_t b2) const; Double_t HardCrossSection(Double_t b1, Double_t b2) const; Double_t NHard(Double_t b1, Double_t b2) const; Double_t FractionOfHardCrossSection(Double_t b1, Double_t b2) const; Double_t Binaries(Double_t b) const; Double_t GetNumberOfBinaries(Double_t b) const; Double_t Participants(Double_t b) const; 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); Double_t GetRandomImpactParameter(Double_t bmin, Double_t bmax); void StoreFunctions() const; void StoreAlmonds() const; void SetLengthDefinition(Int_t def=1) {fEllDef=def;} Int_t GetLengthDef() const {return fEllDef;} 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]) {xy[0] = fXY[0]; xy[1] = fXY[1];} void GetSavedI0I1(Double_t i0i1[2]) {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.); void GetLengthAndPhi(Double_t& ell,Double_t &phi,Double_t b=-1.); void GetLength(Double_t& ell,Double_t b=-1.); void GetLengthsBackToBackAndPhi(Double_t& ell1,Double_t& ell2, Double_t &phi, 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, Double_t b=-1.); void PlotBDistr(Int_t n=1000); void PlotLengthDistr(Int_t n=1000,Bool_t save=kFALSE, const char *fname="length.root"); void PlotLengthB2BDistr(Int_t n=1000,Bool_t save=kFALSE, 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 ellCut=20.) const; void GetI0I1AndPhi(Double_t& integral0,Double_t& integral1,Double_t &phi, Double_t ellCut=20.,Double_t b=-1.); void GetI0I1(Double_t& integral0,Double_t& integral1, Double_t ellCut=20.,Double_t b=-1.); void GetI0I1BackToBackAndPhi(Double_t& integral01,Double_t& integral11, Double_t& integral02,Double_t& integral12, Double_t& phi, Double_t ellCut=20.,Double_t b=-1.); void GetI0I1BackToBackAndPhiAndXY(Double_t& integral01,Double_t& integral11, Double_t& integral02,Double_t& integral12, Double_t& phi,Double_t& x,Double_t&y, Double_t ellCut=20.,Double_t b=-1.); void GetI0I1BackToBack(Double_t& integral01,Double_t& integral11, Double_t& integral02,Double_t& integral12, Double_t ellCut=20.,Double_t b=-1.); void GetI0I1ForPythia(Int_t n,Double_t* phi, Double_t* integral0,Double_t* integral1, Double_t ellCut=20.,Double_t b=-1.); void GetI0I1ForPythiaAndXY(Int_t n,Double_t* phi, Double_t* integral0,Double_t* integral1, 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, const char *fname="i0i1.root"); void PlotI0I1B2BDistr(Int_t n=1000,Double_t ellCut=20.,Bool_t save=kFALSE, const char *fname="i0i1B2B.root"); void PlotAlmonds() const; // Copy AliFastGlauber& operator=(const AliFastGlauber & rhs); void Copy(TObject&) const; protected: 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); 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 TF2* fgWSbz; // Wood-Saxon Function (b, z) static TF1* fgWSz; // Wood-Saxon Function (b = b0, z) static TF1* fgWSta; // Thickness Function static TF2* fgWStarfi; // Kernel for Overlap Function static TF2* fgWKParticipants; // Kernel for number of participants static TF1* fgWParticipants; // Number of participants static TF1* fgWStaa; // Overlap Function static TF2* fgWAlmond; // Interaction Almond static TF1* fgWPathLength0; // Path Length as a function of phi static TF1* fgWPathLength; // Path Length as a function of phi static TF1* fgWIntRadius; // Interaction Radius static TF1* fgWSgeo; // dSigma/db geometric 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* fgWAlmondCurrent; // Interaction Almond used for length Float_t fWSr0; // Wood-Saxon Parameter r0 Float_t fWSd; // Wood-Saxon Parameter d Float_t fWSw; // Wood-Saxon Parameter w Float_t fWSn; // Wood-Saxon Parameter n // (chosen such that integral is one) Float_t fSigmaHard; // Hard Cross Section [mbarn] Float_t fSigmaNN; // NN Cross Section [mbarn] Int_t fA; // Nucleon number of nucleus A 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,2) // Event geometry simulation in the Glauber Model }; #endif