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03d23846 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, 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 | //////////////////////////////////////////////////////////////////////////////// | |
17 | // | |
18 | // This class contains all code which is used to compute any of the values | |
19 | // which can be of interest within a resonance analysis. Besides the obvious | |
20 | // invariant mass, it allows to compute other utility values on all possible | |
21 | // targets, in order to allow a wide spectrum of binning and checks. | |
22 | // When needed, this object can also define a binning in the variable which | |
23 | // it is required to compute, which is used for initializing axes of output | |
24 | // histograms (see AliRsnFunction). | |
25 | // The value computation requires this object to be passed the object whose | |
26 | // informations will be used. This object can be of any allowed input type | |
27 | // (track, pair, event), then this class must inherit from AliRsnTarget. | |
28 | // Then, when value computation is attempted, a check on target type is done | |
29 | // and computation is successful only if expected target matches that of the | |
30 | // passed object. | |
31 | // In some cases, the value computation can require a support external object, | |
32 | // which must then be passed to this class. It can be of any type inheriting | |
33 | // from TObject. | |
34 | // | |
35 | // authors: A. Pulvirenti (alberto.pulvirenti@ct.infn.it) | |
36 | // M. Vala (martin.vala@cern.ch) | |
37 | // | |
38 | //////////////////////////////////////////////////////////////////////////////// | |
39 | ||
40 | #include "Riostream.h" | |
41 | ||
42 | #include "AliLog.h" | |
43 | ||
44 | #include "AliRsnMiniPair.h" | |
45 | #include "AliRsnMiniEvent.h" | |
4fb0dfa3 | 46 | #include "AliRsnMiniParticle.h" |
03d23846 | 47 | |
48 | #include "AliRsnMiniValue.h" | |
49 | ||
50 | ClassImp(AliRsnMiniValue) | |
51 | ||
52 | //_____________________________________________________________________________ | |
53 | AliRsnMiniValue::AliRsnMiniValue(EType type, Bool_t useMC) : | |
54 | TNamed(ValueName(type, useMC), ""), | |
55 | fType(type), | |
56 | fUseMCInfo(useMC) | |
57 | { | |
58 | // | |
59 | // Constructor | |
60 | // | |
61 | } | |
62 | ||
63 | //_____________________________________________________________________________ | |
61f275d1 | 64 | AliRsnMiniValue::AliRsnMiniValue(const AliRsnMiniValue ©) : |
03d23846 | 65 | TNamed(copy), |
66 | fType(copy.fType), | |
67 | fUseMCInfo(copy.fUseMCInfo) | |
68 | { | |
69 | // | |
70 | // Copy constructor | |
71 | // | |
72 | } | |
73 | ||
74 | //_____________________________________________________________________________ | |
61f275d1 | 75 | AliRsnMiniValue &AliRsnMiniValue::operator=(const AliRsnMiniValue ©) |
03d23846 | 76 | { |
77 | // | |
78 | // Assignment operator. | |
79 | // Works like copy constructor. | |
80 | // | |
03d23846 | 81 | TNamed::operator=(copy); |
e6f3a909 | 82 | if (this == ©) |
61f275d1 | 83 | return *this; |
03d23846 | 84 | fType = copy.fType; |
85 | fUseMCInfo = copy.fUseMCInfo; | |
86 | ||
87 | return (*this); | |
88 | } | |
89 | ||
90 | //_____________________________________________________________________________ | |
61f275d1 | 91 | const char *AliRsnMiniValue::TypeName(EType type) |
03d23846 | 92 | { |
93 | // | |
94 | // This method returns a string to give a name to each possible | |
95 | // computation value. | |
96 | // | |
97 | ||
98 | switch (type) { | |
99 | case kVz: return "EventVz"; | |
100 | case kMult: return "EventMult"; | |
101 | case kPlaneAngle: return "EventPlane"; | |
102 | case kLeadingPt: return "EventLeadingPt"; | |
103 | case kPt: return "Pt"; | |
104 | case kPz: return "Pz"; | |
105 | case kInvMass: return "InvMass"; | |
106 | case kInvMassRes: return "InvMassResolution"; | |
2d21288f | 107 | case kInvMassDiff: return "InvMassDifference"; |
03d23846 | 108 | case kEta: return "Eta"; |
109 | case kMt: return "Mt"; | |
110 | case kY: return "Y"; | |
111 | case kPtRatio: return "PtRatio"; | |
112 | case kDipAngle: return "DipAngle"; | |
113 | case kCosThetaStar: return "CosThetaStar"; | |
114 | case kAngleLeading: return "AngleToLeading"; | |
4fb0dfa3 | 115 | case kFirstDaughterPt: return "FirstDaughterPt"; |
116 | case kSecondDaughterPt: return "SecondDaughterPt"; | |
117 | case kFirstDaughterP: return "FirstDaughterP"; | |
118 | case kSecondDaughterP: return "SecondDaughterP"; | |
213adb92 | 119 | case kDCAproduct: return "DaughterDCAproduct"; |
120 | case kFirstDaughterDCA: return "FirstDaughterDCA"; | |
121 | case kSecondDaughterDCA: return "SecondDaughterDCA"; | |
03d23846 | 122 | default: return "Undefined"; |
123 | } | |
124 | } | |
125 | ||
126 | //_____________________________________________________________________________ | |
127 | Float_t AliRsnMiniValue::Eval(AliRsnMiniPair *pair, AliRsnMiniEvent *event) | |
128 | { | |
129 | // | |
130 | // Evaluation of the required value. | |
131 | // In this implementation, fills the member 4-vectors with data | |
132 | // coming from the object passed as argument, and then returns the value | |
133 | // | |
134 | ||
135 | if (!pair && fType > kEventCuts) { | |
136 | AliError("Null pair passed!"); | |
137 | return 1E20; | |
138 | } | |
61f275d1 | 139 | |
03d23846 | 140 | // compute value depending on types in the enumeration |
141 | // if the type does not match any available choice, or if | |
142 | // the computation is not doable due to any problem | |
143 | // (not initialized support object, wrong values, risk of floating point errors) | |
144 | // the method returng kFALSE and sets the computed value to a meaningless number | |
4fb0dfa3 | 145 | Double_t p3[3]= {0.,0.,0.}; |
146 | AliRsnMiniParticle *l; | |
147 | TLorentzVector v; | |
03d23846 | 148 | switch (fType) { |
61f275d1 | 149 | // ---- event values ------------------------------------------------------------------------- |
03d23846 | 150 | case kVz: |
151 | return event->Vz(); | |
152 | case kMult: | |
153 | return event->Mult(); | |
154 | case kPlaneAngle: | |
155 | return event->Angle(); | |
156 | case kLeadingPt: | |
4fb0dfa3 | 157 | l = event->LeadingParticle(); |
158 | if (l) { | |
159 | l->Set4Vector(v,-1.0,fUseMCInfo); | |
160 | return v.Pt(); | |
161 | } | |
03d23846 | 162 | return 0.0; |
e6952ec7 | 163 | case kPt: |
03d23846 | 164 | return pair->Pt(fUseMCInfo); |
165 | case kInvMass: | |
166 | return pair->InvMass(fUseMCInfo); | |
167 | case kEta: | |
168 | return pair->Eta(fUseMCInfo); | |
169 | case kInvMassRes: | |
170 | return pair->InvMassRes(); | |
2d21288f | 171 | case kInvMassDiff: |
172 | return pair->InvMassDiff(); | |
03d23846 | 173 | case kMt: |
174 | return pair->Mt(fUseMCInfo); | |
175 | case kY: | |
176 | return pair->Y(fUseMCInfo); | |
177 | case kPtRatio: | |
178 | return pair->PtRatio(fUseMCInfo); | |
179 | case kDipAngle: | |
180 | return pair->DipAngle(fUseMCInfo); | |
181 | case kCosThetaStar: | |
182 | return pair->CosThetaStar(fUseMCInfo); | |
183 | case kAngleLeading: | |
4fb0dfa3 | 184 | l = event->LeadingParticle(); |
185 | if (l) { | |
186 | l->Set4Vector(v,-1.0,fUseMCInfo); | |
187 | Double_t angle = v.Phi() - pair->Sum(fUseMCInfo).Phi(); | |
188 | ||
189 | //return angle w.r.t. leading particle in the range -pi/2, 3/2pi | |
190 | while (angle >= 1.5 * TMath::Pi()) angle -= 2 * TMath::Pi(); | |
191 | while (angle < -0.5 * TMath::Pi()) angle += 2 * TMath::Pi(); | |
192 | return angle; | |
193 | } | |
194 | // AliWarning("This method is not yet implemented"); | |
195 | return 1E20; | |
397c0062 | 196 | case kFirstDaughterPt: |
197 | return pair->DaughterPt(0,fUseMCInfo); | |
198 | case kSecondDaughterPt: | |
199 | return pair->DaughterPt(1,fUseMCInfo); | |
200 | case kFirstDaughterP: | |
4fb0dfa3 | 201 | pair->DaughterPxPyPz(0,fUseMCInfo, p3); |
397c0062 | 202 | return TMath::Sqrt(p3[0]*p3[0]+p3[1]*p3[1]+p3[2]*p3[2]); |
203 | case kSecondDaughterP: | |
4fb0dfa3 | 204 | pair->DaughterPxPyPz(1,fUseMCInfo, p3); |
397c0062 | 205 | return TMath::Sqrt(p3[0]*p3[0]+p3[1]*p3[1]+p3[2]*p3[2]); |
213adb92 | 206 | case kDCAproduct: |
207 | return pair->DCAProduct(); | |
208 | case kFirstDaughterDCA: | |
209 | return pair->DaughterDCA(0); | |
210 | case kSecondDaughterDCA: | |
211 | return pair->DaughterDCA(1); | |
03d23846 | 212 | default: |
213 | AliError("Invalid value type"); | |
214 | return 1E20; | |
215 | } | |
216 | } |