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2 | /************************************************************************** | |
3 | * This file is property of and copyright by the ALICE HLT Project * | |
4 | * All rights reserved. * | |
5 | * * | |
6 | * Primary Authors: Albin Gaignette | |
7 | * * | |
8 | * Permission to use, copy, modify and distribute this software and its * | |
9 | * documentation strictly for non-commercial purposes is hereby granted * | |
10 | * without fee, provided that the above copyright notice appears in all * | |
11 | * copies and that both the copyright notice and this permission notice * | |
12 | * appear in the supporting documentation. The authors make no claims * | |
13 | * about the suitability of this software for any purpose. It is * | |
14 | * provided "as is" without express or implied warranty. * | |
15 | **************************************************************************/ | |
16 | ||
17 | /** | |
87b87810 | 18 | * @file AliHLTPHOSHistoProdInvMass |
844d7fdd | 19 | * @author Albin Gaignette |
20 | * @date | |
21 | * @brief Histogram producer for PHOS HLT | |
22 | */ | |
23 | ||
24 | // see header file for class documentation | |
25 | // or | |
26 | // refer to README to build package | |
27 | // or | |
28 | // visit http://web.ift.uib.no/~kjeks/doc/alice-hlt | |
29 | ||
87b87810 | 30 | #include "AliHLTPHOSHistoProdInvMass.h" |
844d7fdd | 31 | //#include "AliESDCaloCluster.h" |
32 | #include "TMath.h" | |
33 | ||
34 | #include "AliHLTCaloClusterDataStruct.h" | |
35 | #include "AliHLTCaloClusterReader.h" | |
36 | #include "TObjArray.h" | |
37 | //#include "TClonesArray.h" | |
38 | //#include <iostream> | |
39 | #include "TH1F.h" | |
40 | //#include "TH2F.h" | |
41 | ||
87b87810 | 42 | AliHLTPHOSHistoProdInvMass::AliHLTPHOSHistoProdInvMass() : |
844d7fdd | 43 | fClusterReader(NULL), |
44 | fHistTwoClusterInvMass(0), | |
45 | fHistArrayPtr(0) | |
46 | { | |
47 | // See header file for documentation | |
48 | fHistArrayPtr = new TObjArray; | |
49 | fClusterReader = new AliHLTCaloClusterReader(); | |
50 | ||
51 | fHistTwoClusterInvMass = new TH1F("fHistTwoClusterInvMass", "Invariant mass of two clusters", 200, 0, 1); | |
52 | fHistTwoClusterInvMass->GetXaxis()->SetTitle("m_{#gamma#gamma} GeV"); | |
53 | fHistTwoClusterInvMass->GetYaxis()->SetTitle("Number of counts"); | |
54 | fHistTwoClusterInvMass->SetMarkerStyle(21); | |
55 | fHistArrayPtr->AddLast(fHistTwoClusterInvMass); | |
56 | } | |
57 | ||
87b87810 | 58 | AliHLTPHOSHistoProdInvMass::~AliHLTPHOSHistoProdInvMass() |
844d7fdd | 59 | { |
60 | if(fHistTwoClusterInvMass) | |
61 | { | |
62 | delete fHistTwoClusterInvMass; | |
63 | fHistTwoClusterInvMass = 0; | |
64 | } | |
65 | } | |
66 | ||
87b87810 | 67 | TObjArray* AliHLTPHOSHistoProdInvMass::GetHistograms() |
844d7fdd | 68 | { |
69 | // See header file for documentation | |
70 | ||
71 | return fHistArrayPtr; | |
72 | } | |
73 | ||
87b87810 | 74 | Int_t AliHLTPHOSHistoProdInvMass::DoEvent(AliHLTCaloClusterHeaderStruct* cHeader) { |
844d7fdd | 75 | |
76 | fClusterReader->SetMemory(cHeader); | |
77 | ||
78 | int ncls = cHeader->fNClusters; | |
79 | Float_t* cPos[ncls]; | |
80 | Float_t cEnergy[ncls]; | |
81 | ||
82 | AliHLTCaloClusterDataStruct* cluster; | |
83 | Int_t icls = 0; | |
84 | while ( ( cluster = fClusterReader->NextCluster() ) ) { | |
85 | ||
86 | cPos[icls] = cluster->fGlobalPos; | |
87 | cEnergy[icls] = cluster->fEnergy; | |
88 | ||
89 | icls++; | |
90 | } | |
91 | ||
92 | for(Int_t ipho = 0; ipho<(ncls-1); ipho++) { | |
93 | for(Int_t jpho = ipho+1 ; jpho<ncls ; jpho++) { | |
94 | // Calcul of the theta angle between two photons | |
95 | Double_t theta = (2* asin(0.5*TMath::Sqrt((cPos[ipho][0]-cPos[jpho][0])*(cPos[ipho][0]-cPos[jpho][0]) +(cPos[ipho][1]-cPos[jpho][1])*(cPos[ipho][1]-cPos[jpho][1]))/460)); | |
96 | ||
97 | // Calcul of the mass m of the pion | |
98 | Double_t m =(TMath::Sqrt(2 * cEnergy[ipho]* cEnergy[jpho]*(1-TMath::Cos(theta)))); | |
99 | ||
100 | fHistTwoClusterInvMass->Fill(m); | |
101 | } | |
102 | } | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | ||
108 | ||
109 |