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1 | // | |
2 | // *** Class AliRsnPair *** | |
3 | // | |
4 | // "Core" method for defining the work on a pari of particles. | |
5 | // For one analysis, one must setup one of this for each pair he wants to analyze, | |
6 | // adding to it all analysis which he desires to do. | |
7 | // Here he defines the cuts, and the particle types and charges, and can add | |
8 | // functions which do different operations on the same pair, and some binning | |
9 | // with respect to some kinematic variables (eta, momentum) | |
10 | // | |
11 | // authors: A. Pulvirenti (email: alberto.pulvirenti@ct.infn.it) | |
12 | // M. Vala (email: martin.vala@cern.ch) | |
13 | // | |
14 | ||
15 | #include <TList.h> | |
16 | ||
17 | #include "AliLog.h" | |
18 | ||
19 | #include "AliRsnMother.h" | |
20 | #include "AliRsnCutSet.h" | |
21 | ||
22 | #include "AliRsnPair.h" | |
23 | ||
24 | ClassImp(AliRsnPair) | |
25 | ||
26 | //_____________________________________________________________________________ | |
27 | AliRsnPair::AliRsnPair(const char *name, AliRsnPairDef *def) : | |
28 | TNamed(name, ""), | |
29 | fOnlyTrue(kFALSE), | |
30 | fCheckDecay(kFALSE), | |
31 | fIsMixed(kFALSE), | |
32 | fCount(0), | |
33 | fPairDef(def), | |
34 | fCutManager(Form("cutMgr_%s", name)), | |
35 | fMother() | |
36 | { | |
37 | // | |
38 | // Default constructor | |
39 | // | |
40 | } | |
41 | ||
42 | //_____________________________________________________________________________ | |
43 | AliRsnPair::AliRsnPair(const AliRsnPair& copy) : | |
44 | TNamed(copy), | |
45 | fOnlyTrue(copy.fOnlyTrue), | |
46 | fCheckDecay(copy.fCheckDecay), | |
47 | fIsMixed(copy.fIsMixed), | |
48 | fCount(copy.fCount), | |
49 | fPairDef(copy.fPairDef), | |
50 | fCutManager(copy.fCutManager), | |
51 | fMother(copy.fMother) | |
52 | { | |
53 | // | |
54 | // Default constructor | |
55 | // | |
56 | } | |
57 | ||
58 | //_____________________________________________________________________________ | |
59 | AliRsnPair& AliRsnPair::operator=(const AliRsnPair& copy) | |
60 | { | |
61 | fOnlyTrue = copy.fOnlyTrue; | |
62 | fCheckDecay = copy.fCheckDecay; | |
63 | fIsMixed = copy.fIsMixed; | |
64 | fCount = copy.fCount; | |
65 | fPairDef = copy.fPairDef; | |
66 | fMother = copy.fMother; | |
67 | fCutManager = copy.fCutManager; | |
68 | ||
69 | return (*this); | |
70 | } | |
71 | ||
72 | //_____________________________________________________________________________ | |
73 | AliRsnPair::~AliRsnPair() | |
74 | { | |
75 | // | |
76 | // Destructor | |
77 | // | |
78 | } | |
79 | ||
80 | //_____________________________________________________________________________ | |
81 | void AliRsnPair::Print(Option_t* /*option*/) const | |
82 | { | |
83 | // | |
84 | // Prints info about pair | |
85 | // | |
86 | } | |
87 | ||
88 | //_____________________________________________________________________________ | |
89 | Bool_t AliRsnPair::Fill | |
90 | (AliRsnDaughter *daughter1, AliRsnDaughter *daughter2, Bool_t refFirst) | |
91 | { | |
92 | // | |
93 | // Checks that first argument matches definitions for first daughter | |
94 | // and the same for second argument, where the order is defined by | |
95 | // the AliRsnPairDef data member. | |
96 | // If the matching is successful, the AliRsnMother data member is | |
97 | // initialized using the mass hypotheses defined here and the momenta | |
98 | // in the passed daughters. | |
99 | // The third argument is necessary to choose which one of the possible two | |
100 | // events owning the two daughter will be used as reference. | |
101 | // | |
102 | ||
103 | // check matching and exit if one of them fails | |
104 | // if true pair is required, this is taken into account: | |
105 | // if both true pairs and correct decay tree is required, | |
106 | // then we must be sure that also the true PID of daughters matches, | |
107 | // instead if correct decay tree is not required this additional check is not done | |
108 | if (!fPairDef->GetDef1()->MatchesDaughter(daughter1, fOnlyTrue && fCheckDecay)) return kFALSE; | |
109 | if (!fPairDef->GetDef2()->MatchesDaughter(daughter2, fOnlyTrue && fCheckDecay)) return kFALSE; | |
110 | ||
111 | // if matching is successful | |
112 | // compute 4-momenta of daughters and mother | |
113 | fMother.SetDaughter(0, daughter1); | |
114 | fMother.SetDaughter(1, daughter2); | |
115 | fMother.ComputeSum(fPairDef->GetMass1(), fPairDef->GetMass2()); | |
116 | ||
117 | // assign reference event | |
118 | if (refFirst) fMother.SetRefEvent(daughter1->GetOwnerEvent()); else fMother.SetRefEvent(daughter2->GetOwnerEvent()); | |
119 | ||
120 | // if required a true pair, check this here and eventually return a fail message | |
121 | // this is done using the method AliRsnMother::CommonMother with 2 arguments | |
122 | // passed by reference, where the real GEANT label of the particle is stored | |
123 | // and one can check if these tracks are both really secondaries (ID >= 0) | |
124 | if (fOnlyTrue) { | |
125 | Int_t m0, m1, common; | |
126 | common = fMother.CommonMother(m0, m1); | |
127 | if (m0 < 0 || m1 < 0) return kFALSE; | |
128 | if (common != fPairDef->GetMotherPDG()) return kFALSE; | |
129 | } | |
130 | ||
131 | // point to first event as reference | |
132 | // and checks the pair cuts, | |
133 | // (done first because it is more likely | |
134 | // that it is not passed and execution is faster) | |
135 | if (!fCutManager.PassMotherCuts(&fMother)) return kFALSE; | |
136 | ||
137 | // cuts on track #1 & common | |
138 | if (!fCutManager.PassDaughter1Cuts(daughter1)) { | |
139 | AliDebug(AliLog::kDebug + 2, "Specific cuts for track #1 not passed"); | |
140 | return kFALSE; | |
141 | } | |
142 | if (!fCutManager.PassCommonDaughterCuts(daughter1)) { | |
143 | AliDebug(AliLog::kDebug + 2, "Common cuts for track #1 not passed"); | |
144 | return kFALSE; | |
145 | } | |
146 | ||
147 | // cuts on track #2 & common | |
148 | if (!fCutManager.PassDaughter2Cuts(daughter2)) { | |
149 | AliDebug(AliLog::kDebug + 2, "Specific cuts for track #2 not passed"); | |
150 | return kFALSE; | |
151 | } | |
152 | if (!fCutManager.PassCommonDaughterCuts(daughter2)) { | |
153 | AliDebug(AliLog::kDebug + 2, "Common cuts for track #2 not passed"); | |
154 | return kFALSE; | |
155 | } | |
156 | ||
157 | // if pair is accepted, increment counter | |
158 | ++fCount; | |
159 | ||
160 | return kTRUE; | |
161 | } | |
162 | ||
163 | //_____________________________________________________________________________ | |
164 | void AliRsnPair::Compute() | |
165 | { | |
166 | // | |
167 | // Virtual method to compute pair quantities of interest | |
168 | // | |
169 | ||
170 | AliWarning("Implement this method in derived classes"); | |
171 | } | |
172 | ||
173 | //_____________________________________________________________________________ | |
174 | void AliRsnPair::Init(const char* /*prefix*/, TList* /*list*/) | |
175 | { | |
176 | // | |
177 | // Virtual method to compute pair quantities of interest | |
178 | // | |
179 | ||
180 | AliWarning("Implement this method in derived classes"); | |
181 | } |