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 **************************************************************************/
18 Revision 1.4 2000/11/30 07:12:49 alibrary
19 Introducing new Rndm and QA classes
21 Revision 1.3 2000/10/02 21:28:06 fca
22 Removal of useless dependecies via forward declarations
24 Revision 1.2 2000/07/11 18:24:55 fca
25 Coding convention corrections + few minor bug fixes
27 Revision 1.1 2000/06/09 20:22:58 morsch
28 Same class as previously in AliSimpleGen.cxx
29 All coding rule violations except RS3 corrected (AM)
35 // Generator for particles in a preset
36 // kinematic range (flat distribution)
37 // Note that for a given theta pt and p are not independent
38 // Range for only one variable (pt or p) should be given.
40 // Comments and suggestions: andreas.morsch@cern.ch
44 <img src="picts/AliGeneratorClass.gif">
47 <font size=+2 color=red>
48 <p>The responsible person for this module is
49 <a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
55 ///////////////////////////////////////////////////////////////////
57 #include "AliGenBox.h"
64 //_____________________________________________________________________________
65 AliGenBox::AliGenBox()
69 // Default constructor
74 //_____________________________________________________________________________
75 AliGenBox::AliGenBox(Int_t npart)
79 // Standard constructor
82 fTitle="Box particle generator";
83 // Generate Proton by default
87 //_____________________________________________________________________________
89 void AliGenBox::Generate()
92 // Generate one trigger
95 Float_t polar[3]= {0,0,0};
100 Double_t pmom, theta, phi, pt;
104 for (j=0;j<3;j++) origin[j]=fOrigin[j];
105 if(fVertexSmear==kPerEvent) {
108 origin[j]+=fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
109 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
112 for(i=0;i<fNpart;i++) {
114 theta=fThetaMin+random[0]*(fThetaMax-fThetaMin);
115 if(TestBit(kMomentumRange)) {
116 pmom=fPMin+random[1]*(fPMax-fPMin);
117 pt=pmom*TMath::Sin(theta);
120 pt=fPtMin+random[1]*(fPtMax-fPtMin);
121 pmom=pt/TMath::Sin(theta);
123 phi=fPhiMin+random[2]*(fPhiMax-fPhiMin);
124 p[0] = pt*TMath::Cos(phi);
125 p[1] = pt*TMath::Sin(phi);
126 p[2] = pmom*TMath::Cos(theta);
128 if(fVertexSmear==kPerTrack) {
131 origin[j]=fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
132 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
135 gAlice->SetTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
139 //_____________________________________________________________________________
141 void AliGenBox::Init()
143 // Initialisation, check consistency of selected ranges
144 if(TestBit(kPtRange)&&TestBit(kMomentumRange))
145 Fatal("Init","You should not set the momentum range and the pt range!\n");
146 if((!TestBit(kPtRange))&&(!TestBit(kMomentumRange)))
147 Fatal("Init","You should set either the momentum or the pt range!\n");