First commit.
[u/mrichter/AliRoot.git] / FASTSIM / AliFastGlauber.h
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5b3a5a5d 1#ifndef ALIFASTGLAUBER_H
2#define ALIFASTGLAUBER_H
3/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
5
6/* $Id$ */
7
8#include <TObject.h>
9class TF1;
10class TF2;
11
12class AliFastGlauber : public TObject {
13 public:
14 AliFastGlauber();
15 virtual ~AliFastGlauber(){;}
16 void SetWoodSaxonParameters(Double_t r0, Double_t d, Double_t w, Double_t n)
17 {fWSr0 = r0; fWSd = d; fWSw = w; fWSn = n;}
18 void SetMaxImpact(Float_t bmax = 20.) {fbMax = bmax;};
19 void SetHardCrossSection(Float_t xs = 6.6) {fSigmaHard = xs;}
20
21 static Double_t WSb (Double_t *xx, Double_t *par);
22 static Double_t WSbz (Double_t *xx, Double_t *par);
23 static Double_t WSz (Double_t *xx, Double_t *par);
24 static Double_t WSta (Double_t *xx, Double_t *par);
25 static Double_t WStarfi (Double_t *xx, Double_t *par);
26 static Double_t WStaa (Double_t *xx, Double_t *par);
27 static Double_t WSgeo (Double_t *xx, Double_t *par);
28 static Double_t WSbinary (Double_t *xx, Double_t *par);
29 static Double_t WSN (Double_t *xx, Double_t *par);
30 void Init(Int_t mode = 0);
31 void DrawWSb();
32 void DrawThickness();
33 void DrawOverlap();
34 void DrawGeo();
35 void DrawBinary();
36 void DrawN();
37 void DrawKernel();
38 Double_t CrossSection(Double_t b1, Double_t b2);
39 Double_t FractionOfHardCrossSection(Double_t b1, Double_t b2);
40 Double_t Binaries(Double_t b);
41 TF2* Kernel() {return fWStarfi;}
42 TF1* Overlap() {return fWStaa;}
43 void SimulateTrigger(Int_t n);
44 void GetRandom(Float_t& b, Float_t& p, Float_t& mult);
45 Float_t GetRandomImpactParameter(Float_t bmin, Float_t bmax);
46 protected:
47 static TF1* fWSb; // Wood-Saxon Function (b)
48 static TF2* fWSbz; // Wood-Saxon Function (b, z)
49 static TF1* fWSz; // Wood-Saxon Function (b = b0, z)
50 static TF1* fWSta; // Thickness Function
51 static TF2* fWStarfi; // Kernel for Overlap Function
52 static TF1* fWStaa; // Overlap Function
53 static TF1* fWSgeo; // dSigma/db geometric
54 static TF1* fWSbinary; // dSigma/db binary
55 static TF1* fWSN; // dN/db binary
56
57 Float_t fWSr0; // Wood-Saxon Parameter r0
58 Float_t fWSd; // Wood-Saxon Parameter d
59 Float_t fWSw; // Wood-Saxon Parameter w
60 Float_t fWSn; // Wood-Saxon Parameter n
61 Float_t fSigmaHard; // Hard Cross Section
62 static Float_t fbMax; // Maximum Impact Parameter
63
64 ClassDef(AliFastGlauber,1) // Event geometry simulation in the Glauber Model
65};
66
67#endif
68
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70