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790bbabf | 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 | ||
88cb7938 | 16 | /* $Id$ */ |
790bbabf | 17 | |
790bbabf | 18 | |
675e9664 | 19 | // Generator for particles in a preset |
20 | // kinematic range (flat distribution) | |
21 | // Note that for a given theta pt and p are not independent | |
22 | // Range for only one variable (pt or p) should be given. | |
23 | // | |
24 | // Comments and suggestions: andreas.morsch@cern.ch | |
790bbabf | 25 | // |
26 | //Begin_Html | |
27 | /* | |
28 | <img src="picts/AliGeneratorClass.gif"> | |
29 | </pre> | |
30 | <br clear=left> | |
31 | <font size=+2 color=red> | |
32 | <p>The responsible person for this module is | |
33 | <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>. | |
34 | </font> | |
35 | <pre> | |
36 | */ | |
37 | //End_Html | |
38 | // // | |
39 | /////////////////////////////////////////////////////////////////// | |
40 | ||
116cbefd | 41 | #include "TPDGCode.h" |
42 | ||
43 | #include "AliConst.h" | |
790bbabf | 44 | #include "AliGenBox.h" |
45 | #include "AliRun.h" | |
790bbabf | 46 | |
47 | ClassImp(AliGenBox) | |
48 | ||
49 | //_____________________________________________________________________________ | |
50 | AliGenBox::AliGenBox() | |
51 | :AliGenerator() | |
52 | { | |
53 | // | |
54 | // Default constructor | |
55 | // | |
56 | fIpart=0; | |
57 | } | |
58 | ||
59 | //_____________________________________________________________________________ | |
60 | AliGenBox::AliGenBox(Int_t npart) | |
61 | :AliGenerator(npart) | |
62 | { | |
63 | // | |
64 | // Standard constructor | |
65 | // | |
8b31bfac | 66 | fName = "Box"; |
67 | fTitle = "Box particle generator"; | |
790bbabf | 68 | // Generate Proton by default |
69 | fIpart=kProton; | |
70 | } | |
71 | ||
72 | //_____________________________________________________________________________ | |
73 | ||
74 | void AliGenBox::Generate() | |
75 | { | |
76 | // | |
77 | // Generate one trigger | |
78 | // | |
79 | ||
80 | Float_t polar[3]= {0,0,0}; | |
81 | // | |
82 | Float_t origin[3]; | |
83 | Float_t p[3]; | |
84 | Int_t i, j, nt; | |
85 | Double_t pmom, theta, phi, pt; | |
86 | // | |
87 | Float_t random[6]; | |
88 | // | |
89 | for (j=0;j<3;j++) origin[j]=fOrigin[j]; | |
aee8290b | 90 | if(fVertexSmear==kPerEvent) { |
c8f7f6f9 | 91 | Vertex(); |
92 | for (j=0;j<3;j++) origin[j]=fVertex[j]; | |
790bbabf | 93 | } |
c8f7f6f9 | 94 | |
790bbabf | 95 | for(i=0;i<fNpart;i++) { |
65fb704d | 96 | Rndm(random,3); |
790bbabf | 97 | theta=fThetaMin+random[0]*(fThetaMax-fThetaMin); |
98 | if(TestBit(kMomentumRange)) { | |
99 | pmom=fPMin+random[1]*(fPMax-fPMin); | |
100 | pt=pmom*TMath::Sin(theta); | |
101 | } else { | |
102 | ||
103 | pt=fPtMin+random[1]*(fPtMax-fPtMin); | |
104 | pmom=pt/TMath::Sin(theta); | |
105 | } | |
106 | phi=fPhiMin+random[2]*(fPhiMax-fPhiMin); | |
107 | p[0] = pt*TMath::Cos(phi); | |
108 | p[1] = pt*TMath::Sin(phi); | |
109 | p[2] = pmom*TMath::Cos(theta); | |
110 | ||
aee8290b | 111 | if(fVertexSmear==kPerTrack) { |
65fb704d | 112 | Rndm(random,6); |
790bbabf | 113 | for (j=0;j<3;j++) { |
114 | origin[j]=fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
115 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
116 | } | |
117 | } | |
642f15cf | 118 | PushTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt); |
790bbabf | 119 | } |
120 | } | |
121 | ||
122 | //_____________________________________________________________________________ | |
123 | ||
124 | void AliGenBox::Init() | |
125 | { | |
126 | // Initialisation, check consistency of selected ranges | |
127 | if(TestBit(kPtRange)&&TestBit(kMomentumRange)) | |
128 | Fatal("Init","You should not set the momentum range and the pt range!\n"); | |
129 | if((!TestBit(kPtRange))&&(!TestBit(kMomentumRange))) | |
130 | Fatal("Init","You should set either the momentum or the pt range!\n"); | |
131 | } | |
132 |