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c9c6bd3b | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-2002, 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 | * * | |
16 | * Copyright(c) 1997, 1998, 2002, Adrian Alscher and Kai Hencken * | |
17 | * See $ALICE_ROOT/EpEmGen/diffcross.f for full Copyright notice * | |
18 | * * | |
19 | * * | |
20 | * Copyright(c) 2002 Kai Hencken, Yuri Kharlov, Serguei Sadovsky * | |
21 | * See $ALICE_ROOT/EpEmGen/epemgen.f for full Copyright notice * | |
22 | * * | |
23 | **************************************************************************/ | |
24 | //------------------------------------------------------------------------ | |
25 | // TEpEmGen is an interface class to fortran event generator of | |
26 | // single e+e- pair production in ultraperipheral PbPb collisions | |
27 | // at 5.5 GeV/c | |
28 | //% | |
29 | // Yuri.Kharlov@cern.ch | |
30 | // 9 October 2002 | |
31 | //------------------------------------------------------------------------ | |
32 | ||
63e30ba9 | 33 | #include "TRandom.h" |
34 | ||
c9c6bd3b | 35 | #include "TEpEmGen.h" |
36 | #include "TClonesArray.h" | |
37 | #include "TParticle.h" | |
38 | #include "TEcommon.h" | |
39 | ||
40 | #ifndef WIN32 | |
41 | # define ee_init ee_init_ | |
42 | # define ee_event ee_event_ | |
63e30ba9 | 43 | # define eernd eernd_ |
c9c6bd3b | 44 | #else |
45 | # define ee_init EE_INIT | |
46 | # define ee_event EE_EVENT | |
63e30ba9 | 47 | # define eernd EERND |
c9c6bd3b | 48 | #endif |
49 | ||
50 | extern "C" { | |
51 | void ee_init (Double_t &ymin, Double_t &ymax, Double_t &xmin, Double_t &xmax); | |
52 | void ee_event (Double_t &ymin, Double_t &ymax, Double_t &xmin, Double_t &xmax, | |
53 | Double_t &yE, Double_t &yP, Double_t &xE, Double_t &xP, | |
54 | Double_t &phi, Double_t &w); | |
63e30ba9 | 55 | Double_t eernd(Int_t*) { |
56 | Double_t r; | |
57 | do r=gRandom->Rndm(); while(0 >= r || r >= 1); | |
58 | return r; | |
59 | } | |
c9c6bd3b | 60 | } |
61 | ||
62 | ClassImp(TEpEmGen) | |
63 | ||
64 | //------------------------------------------------------------------------------ | |
65 | TEpEmGen::TEpEmGen() : TGenerator("TEpEmGen","TEpEmGen") | |
66 | { | |
67 | // TEpEmGen constructor: creates a TClonesArray in which it will store all | |
68 | // particles. Note that there may be only one functional TEpEmGen object | |
69 | // at a time, so it's not use to create more than one instance of it. | |
70 | ||
71 | delete fParticles; // was allocated as TObjArray in TGenerator | |
72 | fParticles = new TClonesArray("TParticle",2); | |
73 | ||
74 | } | |
75 | ||
76 | //------------------------------------------------------------------------------ | |
77 | TEpEmGen::~TEpEmGen() | |
78 | { | |
79 | // Destroys the object, deletes and disposes all TParticles currently on list. | |
80 | if (fParticles) { | |
81 | fParticles->Delete(); | |
82 | delete fParticles; | |
83 | fParticles = 0; | |
84 | } | |
85 | } | |
86 | ||
87 | //______________________________________________________________________________ | |
88 | void TEpEmGen::GenerateEvent(Double_t ymin, Double_t ymax, Double_t ptmin, Double_t ptmax, | |
89 | Double_t &yElectron, Double_t &yPositron, | |
90 | Double_t &xElectron, Double_t &xPositron, | |
91 | Double_t &phi12, Double_t &weight) | |
92 | { | |
93 | //produce one event | |
94 | ee_event(ymin,ymax,ptmin,ptmax, | |
95 | yElectron,yPositron,xElectron,xPositron, | |
96 | phi12,weight); | |
97 | } | |
98 | ||
99 | //______________________________________________________________________________ | |
100 | void TEpEmGen::Initialize(Double_t ymin, Double_t ymax, Double_t ptmin, Double_t ptmax) | |
101 | { | |
102 | // Initialize EpEmGen | |
103 | Double_t ptminMeV = ptmin*1000; | |
104 | Double_t ptmaxMeV = ptmax*1000; | |
105 | ee_init(ymin,ymax,ptminMeV,ptmaxMeV); | |
106 | } | |
107 | ||
108 | //______________________________________________________________________________ | |
109 | Double_t TEpEmGen::GetXsection() | |
110 | { | |
111 | // Return cross section accumulated so far | |
112 | return EEVENT.Xsecttot; | |
113 | } | |
114 | ||
115 | //______________________________________________________________________________ | |
116 | Double_t TEpEmGen::GetDsection() | |
117 | { | |
118 | // Return cross section error accumulated so far | |
119 | return EEVENT.Dsecttot; | |
120 | } |