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2895972e | 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 | #include "AliVVertex.h" | |
42 | #include "AliMultiplicity.h" | |
43 | #include "AliESDtrackCuts.h" | |
44 | #include "AliESDpid.h" | |
45 | #include "AliAODPid.h" | |
46 | #include "AliCentrality.h" | |
47 | #include "AliESDUtils.h" | |
48 | ||
49 | #include "AliRsnEvent.h" | |
50 | #include "AliRsnDaughter.h" | |
51 | #include "AliRsnMother.h" | |
52 | #include "AliRsnPairDef.h" | |
53 | #include "AliRsnDaughterDef.h" | |
54 | ||
55 | #include "AliRsnValuePair.h" | |
56 | ||
57 | ClassImp(AliRsnValuePair) | |
58 | ||
59 | //_____________________________________________________________________________ | |
60 | AliRsnValuePair::AliRsnValuePair(const char *name, EType type) : | |
61 | AliRsnValue(name, AliRsnTarget::kMother), | |
62 | fType(type) | |
63 | { | |
64 | // | |
65 | // Constructor | |
66 | // | |
67 | } | |
68 | ||
69 | //_____________________________________________________________________________ | |
61f275d1 | 70 | AliRsnValuePair::AliRsnValuePair(const AliRsnValuePair ©) : |
2895972e | 71 | AliRsnValue(copy), |
72 | fType(copy.fType) | |
73 | { | |
74 | // | |
75 | // Copy constructor | |
76 | // | |
77 | } | |
78 | ||
79 | //_____________________________________________________________________________ | |
61f275d1 | 80 | AliRsnValuePair &AliRsnValuePair::operator=(const AliRsnValuePair ©) |
2895972e | 81 | { |
82 | // | |
83 | // Assignment operator. | |
84 | // Works like copy constructor. | |
85 | // | |
86 | ||
87 | AliRsnValue::operator=(copy); | |
e6f3a909 | 88 | if (this == ©) |
61f275d1 | 89 | return *this; |
2895972e | 90 | fType = copy.fType; |
91 | ||
92 | return (*this); | |
93 | } | |
94 | ||
95 | //_____________________________________________________________________________ | |
61f275d1 | 96 | const char *AliRsnValuePair::GetTypeName() const |
2895972e | 97 | { |
98 | // | |
99 | // This method returns a string to give a name to each possible | |
100 | // computation value. | |
101 | // | |
102 | ||
103 | switch (fType) { | |
104 | case kPt: return "PairPt"; | |
105 | case kPz: return "PairPz"; | |
106 | case kInvMass: return "PairInvMass"; | |
107 | case kInvMassRes: return "PairInvMassResolution"; | |
108 | case kEta: return "PairEta"; | |
109 | case kMt: return "PairMt"; | |
110 | case kY: return "PairY"; | |
111 | case kPtRatio: return "PairPtRatio"; | |
112 | case kDipAngle: return "PairDipAngle"; | |
113 | case kCosThetaStar: return "PairCosThetaStar"; | |
b63357a0 | 114 | case kAngleLeading: return "PairAngleToLeading"; |
2895972e | 115 | default: return "Undefined"; |
116 | } | |
117 | } | |
118 | ||
119 | //_____________________________________________________________________________ | |
120 | Bool_t AliRsnValuePair::Eval(TObject *object) | |
121 | { | |
122 | // | |
123 | // Evaluation of the required value. | |
124 | // In this implementation, fills the member 4-vectors with data | |
125 | // coming from the object passed as argument, and then returns the value | |
126 | // | |
127 | ||
61f275d1 | 128 | // coherence check, which also casts object |
2895972e | 129 | // to AliRsnTarget data members and returns kFALSE |
130 | // in case the object is NULL | |
131 | if (!TargetOK(object)) return kFALSE; | |
61f275d1 | 132 | |
2895972e | 133 | // set a reference to the mother momentum |
134 | TLorentzVector &sum = fMother->Sum(fUseMCInfo); | |
135 | TLorentzVector &ref = fMother->Ref(fUseMCInfo); | |
136 | TLorentzVector &p1 = fMother->GetDaughter(0)->P(fUseMCInfo); | |
137 | TLorentzVector &p2 = fMother->GetDaughter(1)->P(fUseMCInfo); | |
61f275d1 | 138 | |
b63357a0 | 139 | // utility variables |
140 | Bool_t success; | |
61f275d1 | 141 | |
2895972e | 142 | // compute value depending on types in the enumeration |
143 | // if the type does not match any available choice, or if | |
144 | // the computation is not doable due to any problem | |
145 | // (not initialized support object, wrong values, risk of floating point errors) | |
146 | // the method returng kFALSE and sets the computed value to a meaningless number | |
147 | switch (fType) { | |
148 | case kPt: | |
149 | fComputedValue = sum.Perp(); | |
150 | return kTRUE; | |
151 | case kInvMass: | |
152 | fComputedValue = sum.M(); | |
153 | return kTRUE; | |
154 | case kEta: | |
155 | fComputedValue = sum.Eta(); | |
156 | return kTRUE; | |
157 | case kInvMassRes: | |
158 | fComputedValue = fMother->Sum(kFALSE).M() - fMother->Sum(kTRUE).M(); | |
159 | fComputedValue /= fMother->Sum(kTRUE).M(); | |
160 | return kTRUE; | |
161 | case kMt: | |
162 | fComputedValue = ref.Mt(); | |
163 | return kTRUE; | |
164 | case kY: | |
165 | fComputedValue = ref.Rapidity(); | |
166 | return kTRUE; | |
167 | case kPtRatio: | |
168 | fComputedValue = TMath::Abs(p1.Perp() - p2.Perp()); | |
169 | fComputedValue /= TMath::Abs(p1.Perp() + p2.Perp()); | |
170 | return kTRUE; | |
171 | case kDipAngle: | |
172 | fComputedValue = p1.Perp() * p2.Perp() + p1.Z() * p2.Z(); | |
173 | fComputedValue /= p1.Mag() * p2.Mag(); | |
174 | return kTRUE; | |
175 | case kCosThetaStar: | |
176 | fComputedValue = fMother->CosThetaStar(); | |
177 | return kTRUE; | |
b63357a0 | 178 | case kAngleLeading: |
179 | fComputedValue = fMother->AngleToLeading(success); | |
180 | return success; | |
2895972e | 181 | default: |
182 | AliError(Form("[%s] Invalid value type for this computation", GetName())); | |
183 | return kFALSE; | |
184 | } | |
185 | } |