1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
16 ////////////////////////////////////////////////////////////////////////////////
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
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
35 // authors: A. Pulvirenti (alberto.pulvirenti@ct.infn.it)
36 // M. Vala (martin.vala@cern.ch)
38 ////////////////////////////////////////////////////////////////////////////////
40 #include "Riostream.h"
44 #include "AliRsnMiniPair.h"
45 #include "AliRsnMiniEvent.h"
47 #include "AliRsnMiniValue.h"
49 ClassImp(AliRsnMiniValue)
51 //_____________________________________________________________________________
52 AliRsnMiniValue::AliRsnMiniValue(EType type, Bool_t useMC) :
53 TNamed(ValueName(type, useMC), ""),
62 //_____________________________________________________________________________
63 AliRsnMiniValue::AliRsnMiniValue(const AliRsnMiniValue ©) :
66 fUseMCInfo(copy.fUseMCInfo)
73 //_____________________________________________________________________________
74 AliRsnMiniValue &AliRsnMiniValue::operator=(const AliRsnMiniValue ©)
77 // Assignment operator.
78 // Works like copy constructor.
80 TNamed::operator=(copy);
84 fUseMCInfo = copy.fUseMCInfo;
89 //_____________________________________________________________________________
90 const char *AliRsnMiniValue::TypeName(EType type)
93 // This method returns a string to give a name to each possible
98 case kVz: return "EventVz";
99 case kMult: return "EventMult";
100 case kPlaneAngle: return "EventPlane";
101 case kLeadingPt: return "EventLeadingPt";
102 case kPt: return "Pt";
103 case kPz: return "Pz";
104 case kInvMass: return "InvMass";
105 case kInvMassRes: return "InvMassResolution";
106 case kInvMassDiff: return "InvMassDifference";
107 case kEta: return "Eta";
108 case kMt: return "Mt";
110 case kPtRatio: return "PtRatio";
111 case kDipAngle: return "DipAngle";
112 case kCosThetaStar: return "CosThetaStar";
113 case kAngleLeading: return "AngleToLeading";
114 default: return "Undefined";
118 //_____________________________________________________________________________
119 Float_t AliRsnMiniValue::Eval(AliRsnMiniPair *pair, AliRsnMiniEvent *event)
122 // Evaluation of the required value.
123 // In this implementation, fills the member 4-vectors with data
124 // coming from the object passed as argument, and then returns the value
127 if (!pair && fType > kEventCuts) {
128 AliError("Null pair passed!");
132 // compute value depending on types in the enumeration
133 // if the type does not match any available choice, or if
134 // the computation is not doable due to any problem
135 // (not initialized support object, wrong values, risk of floating point errors)
136 // the method returng kFALSE and sets the computed value to a meaningless number
138 // ---- event values -------------------------------------------------------------------------
142 return event->Mult();
144 return event->Angle();
147 // ---- pair values --------------------------------------------------------------------------
149 return pair->Pt(fUseMCInfo);
151 return pair->InvMass(fUseMCInfo);
153 return pair->Eta(fUseMCInfo);
155 return pair->InvMassRes();
157 return pair->InvMassDiff();
159 return pair->Mt(fUseMCInfo);
161 return pair->Y(fUseMCInfo);
163 return pair->PtRatio(fUseMCInfo);
165 return pair->DipAngle(fUseMCInfo);
167 return pair->CosThetaStar(fUseMCInfo);
169 AliWarning("This method is not yet implemented");
172 AliError("Invalid value type");