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1 | /************************************************************************** | |
2 | * Copyright(c) 2004, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | /* $Id$ */ | |
17 | ||
18 | //____________________________________________________________________ | |
19 | // | |
20 | // FMD reconstructed multiplicity in a region of a ring. The region | |
21 | // is identified by (strip_min,sector_min)x(strip_max,sector_max) or | |
22 | // by (eta_max,phi_min),(eta_min,phi_max). It's also possible to | |
23 | // get the peudorapidity of the center-of-mass of the region, as well | |
24 | // as the mean azimuthal angle. | |
25 | // | |
26 | // [Note, that minStrip corresponds to maxEta, and maxStrip | |
27 | // corresponds to minEta] | |
28 | // | |
29 | // These objects are usually created by the Poisson reconstruction | |
30 | // method. | |
31 | // | |
32 | #include "AliFMDMultRegion.h" // ALIFMDPARTICLES_H | |
33 | #include <TString.h> // ROOT_TString | |
34 | #include <Riostream.h> // ROOT_Riostream | |
35 | ||
36 | //____________________________________________________________________ | |
37 | ClassImp(AliFMDMultRegion) | |
38 | ||
39 | ||
40 | //____________________________________________________________________ | |
41 | AliFMDMultRegion::AliFMDMultRegion() | |
42 | : fDetector(0), | |
43 | fRing('\0'), | |
44 | fMinSector(0), | |
45 | fMaxSector(0), | |
46 | fMinStrip(0), | |
47 | fMaxStrip(0), | |
48 | fMinEta(0), | |
49 | fMaxEta(0), | |
50 | fMinPhi(0), | |
51 | fMaxPhi(0) | |
52 | {} | |
53 | ||
54 | //____________________________________________________________________ | |
55 | AliFMDMultRegion::AliFMDMultRegion(UShort_t detector, Char_t ring, | |
56 | UShort_t minSector, UShort_t maxSector, | |
57 | UShort_t minStrip, UShort_t maxStrip, | |
58 | Float_t minEta, Float_t maxEta, | |
59 | Float_t minPhi, Float_t maxPhi, | |
60 | Float_t particles, UShort_t method) | |
61 | : AliFMDMult(particles, method), | |
62 | fDetector(detector), | |
63 | fRing(ring), | |
64 | fMinSector(minSector), | |
65 | fMaxSector(maxSector), | |
66 | fMinStrip(minStrip), | |
67 | fMaxStrip(maxStrip), | |
68 | fMinEta(minEta), | |
69 | fMaxEta(maxEta), | |
70 | fMinPhi(minPhi), | |
71 | fMaxPhi(maxPhi) | |
72 | {} | |
73 | ||
74 | //____________________________________________________________________ | |
75 | Float_t | |
76 | AliFMDMultRegion::Eta() const | |
77 | { | |
78 | // Return the center-of-mass eta of the region. This is calculated | |
79 | // as the weighted mean of min and max eta, where the weights are | |
80 | // the length of the arcs of the upper and lower edge of the region: | |
81 | // | |
82 | // (maxPhi - minPhi) | |
83 | // f = ----------------- | |
84 | // 360 | |
85 | // | |
86 | // w_max = ds*minStrip*2*pi*f | |
87 | // | |
88 | // w_min = ds*maxStrip*2*pi*f | |
89 | // | |
90 | // 1/w^2 = 1/w_max^2 + 1/w_min^2 | |
91 | // | |
92 | // 1 1 | |
93 | // = ---------------------- + ---------------------- | |
94 | // (ds*minStrip*2*pi*f)^2 (ds*maxStrip*2*pi*f)^2 | |
95 | // | |
96 | // (ds*maxStrip*2*pi*f)^2 + (ds*minStrip*2*pi*f)^2 | |
97 | // = ----------------------------------------------- | |
98 | // (ds*maxStrip*2*pi*f)^2 * (ds*minStrip*2*pi*f)^2 | |
99 | // | |
100 | // | |
101 | // 4 * pi^2 * ds^2 * f^2 (maxStrip^2 + minStrip^2) | |
102 | // = ------------------------------------------------- | |
103 | // 16 * pi^4 * ds^4 * f^4 minStrip^2 * maxStrip^2 | |
104 | // | |
105 | // (maxStrip^2 + minStrip^2) | |
106 | // = ------------------------------------------------- | |
107 | // 4 * pi^2 * ds^2 * f^2 minStrip^2 * maxStrip^2 | |
108 | // | |
109 | // <eta> = (maxEta/w_max^2 + minEta /w_min^2) / (1/w^2) | |
110 | // | |
111 | // w_min^2 * maxEta + w_max^2 * minEta | |
112 | // = ------------------------------------ / (1/w^2) | |
113 | // w_max^2 * w_min^2 | |
114 | // | |
115 | // 4*pi^2*ds^2*(maxStrip*maxEta + minStrip*minEta) | |
116 | // = ----------------------------------------------- / (1/w^2) | |
117 | // 16*pi^4*ds^4*f^4*minStrip^2*maxStrip^2 | |
118 | // | |
119 | // maxStrip * maxEta + minStrip * minEta | |
120 | // = ------------------------------------- | |
121 | // 4*pi^2*ds^2*f^2*minStrip^2*maxStrip^2 | |
122 | // | |
123 | // 4*pi^2*ds^2*f^2*minStrip^2*maxStrip^2 | |
124 | // * ------------------------------------- | |
125 | // maxStrip^2+minStrip^2 | |
126 | // | |
127 | // maxStrip * maxEta + minStrip * minEta | |
128 | // = ------------------------------------- | |
129 | // maxStrip^2 + minStrip^2 | |
130 | // _ | |
131 | // |_| | |
132 | // | |
133 | Float_t eta = (fMaxStrip * fMaxEta + fMinStrip * fMinEta) | |
134 | / (fMaxStrip * fMaxStrip + fMinStrip * fMinStrip); | |
135 | return eta; | |
136 | } | |
137 | ||
138 | ||
139 | //____________________________________________________________________ | |
140 | void | |
141 | AliFMDMultRegion::Print(Option_t* option) const | |
142 | { | |
143 | // Print information | |
144 | // | |
145 | // Options: | |
146 | // D: Detector (default) | |
147 | // S: Sector range | |
148 | // T: Strip range | |
149 | // E: Eta range (default) | |
150 | // P: Phi range (default) | |
151 | // | |
152 | TString opt(option); | |
153 | cout << "FMD Multiplicity in a region: " << fParticles << endl; | |
154 | if (opt.Contains("D", TString::kIgnoreCase)) | |
155 | cout << " Detector: FMD" << fDetector << fRing | |
156 | << "[" << fMinSector << "-" << fMaxSector | |
157 | << "," << fMinStrip << "-" << fMaxStrip << "]" << endl; | |
158 | if (opt.Contains("E", TString::kIgnoreCase)) | |
159 | cout << " Eta range: [" << fMinEta << "," << fMaxEta << endl; | |
160 | if (opt.Contains("P", TString::kIgnoreCase)) | |
161 | cout << " Phi range: [" << fMinPhi << "," << fMaxPhi << endl; | |
162 | AliFMDMult::Print(option); | |
163 | } | |
164 | ||
165 | ||
166 | //____________________________________________________________________ | |
167 | // | |
168 | // EOF | |
169 | // |