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a1f80595 | 1 | // |
2 | // $Id$ | |
3 | // | |
4 | // Script that contains a class to draw hits, using the | |
5 | // AliFMDInputHits class in the util library. | |
6 | // | |
7 | // It draws the energy loss versus the p/(mq^2). It can be overlayed | |
8 | // with the Bethe-Bloc curve to show how the simulation behaves | |
9 | // relative to the expected. | |
10 | // | |
11 | // Use the script `Compile.C' to compile this class using ACLic. | |
12 | // | |
13 | #include <TH2D.h> | |
14 | #include <AliFMDHit.h> | |
15 | #include <AliFMDInput.h> | |
16 | #include <iostream> | |
17 | #include <TStyle.h> | |
9aa0bdc4 | 18 | #include <TArrayF.h> |
a1f80595 | 19 | |
20 | class DrawHits : public AliFMDInputHits | |
21 | { | |
22 | private: | |
23 | TH2D* fElossVsPMQ; // Histogram | |
088f8e79 | 24 | Int_t fPdg; |
a1f80595 | 25 | public: |
088f8e79 | 26 | TArrayF MakeLogScale(Int_t n, Double_t min, Double_t max) |
27 | { | |
28 | TArrayF bins(n+1); | |
29 | Float_t dp = n / TMath::Log10(max / min); | |
30 | Float_t pmin = TMath::Log10(min); | |
31 | bins[0] = min; | |
32 | for (Int_t i = 1; i < n+1; i++) { | |
33 | Float_t p = pmin + i / dp; | |
34 | bins[i] = TMath::Power(10, p); | |
9aa0bdc4 | 35 | } |
088f8e79 | 36 | return bins; |
37 | } | |
38 | DrawHits(Int_t m=1000, Double_t emin=1, Double_t emax=1000, | |
39 | Int_t n=900, Double_t tmin=1e-2, Double_t tmax=1e3, | |
40 | Int_t pdg=211) | |
41 | : fPdg(pdg) | |
42 | { | |
43 | TArrayF tkine(MakeLogScale(n, tmin, tmax)); | |
44 | TArrayF eloss(MakeLogScale(m, emin, emax)); | |
45 | fElossVsPMQ = new TH2D("bad", "#Delta E/#Delta x vs. p/(mq^{2})", | |
9aa0bdc4 | 46 | tkine.fN-1, tkine.fArray, eloss.fN-1, eloss.fArray); |
088f8e79 | 47 | fElossVsPMQ->SetXTitle(Form("p%s", (fPdg == 0 ? "/(mq^{2})" : " [GeV]"))); |
48 | fElossVsPMQ->SetYTitle("#Delta E/#Delta x [MeV/cm]"); | |
a1f80595 | 49 | } |
50 | Bool_t ProcessHit(AliFMDHit* hit, TParticle*) | |
51 | { | |
52 | if (!hit) { | |
53 | std::cout << "No hit" << std::endl; | |
54 | return kFALSE; | |
55 | } | |
088f8e79 | 56 | |
57 | if (hit->IsStop()) return kTRUE; | |
58 | Float_t x = hit->P(); | |
59 | Float_t y = hit->Edep()/hit->Length(); | |
60 | if (fPdg != 0) { | |
61 | if (TMath::Abs(hit->Pdg()) != fPdg) return kTRUE; | |
62 | } | |
63 | else { | |
64 | Float_t q = hit->Q() / 3.; | |
65 | if (hit->M() == 0 || q == 0) return kTRUE; | |
66 | x /= hit->M(); | |
67 | y /= q * q; | |
68 | } | |
69 | fElossVsPMQ->Fill(x, y); | |
a1f80595 | 70 | return kTRUE; |
71 | } | |
72 | Bool_t Finish() | |
73 | { | |
74 | gStyle->SetPalette(1); | |
9aa0bdc4 | 75 | gStyle->SetOptTitle(0); |
088f8e79 | 76 | gStyle->SetCanvasColor(0); |
77 | gStyle->SetCanvasBorderSize(0); | |
78 | gStyle->SetPadColor(0); | |
79 | gStyle->SetPadBorderSize(0); | |
a1f80595 | 80 | fElossVsPMQ->SetStats(kFALSE); |
81 | fElossVsPMQ->Draw("COLZ"); | |
82 | return kTRUE; | |
83 | } | |
84 | }; | |
85 | ||
86 | //____________________________________________________________________ | |
87 | // | |
88 | // EOF | |
89 | // |