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77f4c245 | 1 | /**************************************************************************\r |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *\r | |
3 | * *\r | |
4 | * Author: The ALICE Off-line Project. *\r | |
5 | * Contributors are mentioned in the code where appropriate. *\r | |
6 | * *\r | |
7 | * Permission to use, copy, modify and distribute this software and its *\r | |
8 | * documentation strictly for non-commercial purposes is hereby granted *\r | |
9 | * without fee, provided that the above copyright notice appears in all *\r | |
10 | * copies and that both the copyright notice and this permission notice *\r | |
11 | * appear in the supporting documentation. The authors make no claims *\r | |
12 | * about the suitability of this software for any purpose. It is *\r | |
13 | * provided "as is" without express or implied warranty. *\r | |
14 | **************************************************************************/\r | |
15 | \r | |
16 | \r | |
17 | // Library class for particle pt and y distributions used for \r | |
18 | // ITS Upgrade related signal simulations.\r | |
19 | //\r | |
20 | // Author: Annalisa Mastroserio <Annalisa.Mastroserio@cern.ch>\r | |
21 | //\r | |
22 | \r | |
23 | #include <TPDGCode.h>\r | |
24 | #include <TMath.h>\r | |
25 | #include <TRandom.h>\r | |
26 | #include <TString.h>\r | |
27 | \r | |
28 | #include "AliGenITSULib.h"\r | |
29 | #include "AliLog.h"\r | |
30 | \r | |
31 | ClassImp(AliGenITSULib)\r | |
32 | \r | |
33 | typedef Double_t (*GenFunc) (const Double_t*, const Double_t*);\r | |
34 | typedef Int_t (*GenFuncIp) (TRandom *);\r | |
35 | \r | |
36 | \r | |
37 | Double_t AliGenITSULib::PtLcDist( const Double_t *x, const Double_t *)\r | |
38 | {\r | |
39 | // pt-distribution\r | |
40 | // same shape as the Lb pt distribution for high pt were overestimated. The Lb fitting funcion has been\r | |
41 | // used from 3.5 GeV/c on. At smaller Pt, the shape is likely as sqrt(x)*exp(-x) \r | |
42 | Double_t par[6]={2.781336,1.353902,4.634330,(145479448.743187/202262270.892062),1.789479,-1.329143}; \r | |
43 | Double_t y=0;\r | |
44 | if(x[0]<3.5) y= par[3]*(TMath::Power(x[0],par[4]))*TMath::Exp(x[0]*par[5]);\r | |
45 | else y= x[0]/TMath::Power((1+TMath::Power(x[0]/par[0],par[1])),par[2]);\r | |
46 | return y;\r | |
47 | }\r | |
48 | \r | |
49 | \r | |
50 | Double_t AliGenITSULib::PtLbDist( const Double_t *x, const Double_t *)\r | |
51 | {\r | |
52 | // pt-distribution (fitted in 0-30 GeV/c)\r | |
53 | Double_t par[4]={3.42500e-03,6.18902,1.76908,3.24823};\r | |
54 | return par[0]*x[0]/TMath::Power((1+TMath::Power(x[0]/par[1],par[2])),par[3]);\r | |
55 | }\r | |
56 | \r | |
57 | GenFunc AliGenITSULib::GetPt(Int_t iPID, const char * sForm) const\r | |
58 | {\r | |
59 | // Return pointer to Pt parameterisation\r | |
60 | AliDebug(1,Form("PID: %i, form: %s \n",iPID,sForm)); \r | |
61 | TString type(sForm);\r | |
62 | GenFunc func;\r | |
63 | \r | |
64 | if(type=="FLAT") {\r | |
65 | func=PtFlat;\r | |
66 | } else if(type=="DIST") {\r | |
67 | \r | |
68 | switch(TMath::Abs(iPID)) {\r | |
69 | \r | |
70 | case kLb : func=PtLbDist; break; \r | |
71 | case kLc : func=PtLcDist; break; \r | |
72 | case kXi_c : func=PtLcDist; break;\r | |
73 | case kBplus : func=PtLbDist; break;\r | |
74 | case kBzero : func=PtLbDist; break;\r | |
75 | case kDs : func=PtLcDist; break;\r | |
76 | case kDplus : func=PtLcDist; break;\r | |
77 | default : AliError(Form("Unknown particle type: %i, Pt dist is 0",iPID)); func=0;\r | |
78 | } \r | |
79 | }else {\r | |
80 | AliError(Form("Unknown Pt distribution %s. Pt distribution is set to 0 ",sForm));\r | |
81 | func=0;\r | |
82 | }\r | |
83 | \r | |
84 | return func;\r | |
85 | }\r | |
86 | \r | |
87 | GenFunc AliGenITSULib::GetY(Int_t iPID, const char *sForm) const\r | |
88 | {\r | |
89 | GenFunc func;\r | |
90 | \r | |
91 | if(TMath::Abs(iPID) != kLc && TMath::Abs(iPID) != kLb && TMath::Abs(iPID) != kXi_c && TMath::Abs(iPID) != kBplus && TMath::Abs(iPID) != kBzero && TMath::Abs(iPID)!=kDplus && TMath::Abs(iPID)!=kDs) {\r | |
92 | AliError(Form("Unknown PID: %i, form: %s, returning 0",iPID,sForm)); ////////// \r | |
93 | func=0;\r | |
94 | } else { \r | |
95 | func = YFlat;\r | |
96 | }\r | |
97 | return func;\r | |
98 | }\r | |
99 | \r | |
100 | GenFuncIp AliGenITSULib::GetIp(Int_t iPID, const char *sForm) const\r | |
101 | {\r | |
102 | AliDebug(1,Form(" %i - %s",iPID,sForm));\r | |
103 | // Return pointer to particle type parameterisation\r | |
104 | GenFuncIp id;\r | |
105 | \r | |
106 | if(TMath::Abs(iPID) != kLc && TMath::Abs(iPID) != kLb && TMath::Abs(iPID) != kXi_c && TMath::Abs(iPID) != kBplus && TMath::Abs(iPID) != kBzero && TMath::Abs(iPID)!=kDplus && TMath::Abs(iPID)!=kDs) {\r | |
107 | AliError(Form("Unknown PID: %i, form: %s, return 0",iPID,sForm)); ////////// \r | |
108 | id = 0;\r | |
109 | } else {\r | |
110 | switch (iPID){\r | |
111 | case kLc : return id=IpLcPlus;\r | |
112 | case -kLc : return id=IpLcMinus;\r | |
113 | case kLb : return id=IpLb;\r | |
114 | case -kLb : return id=IpLbBar;\r | |
115 | case kXi_c : return id=IpXic;\r | |
116 | case -kXi_c : return id=IpXicBar;\r | |
117 | case kBplus : return id=IpBPlus;\r | |
118 | case kBzero : return id=IpB0;\r | |
119 | case -kBzero: return id=IpB0Bar;\r | |
120 | case -kBplus: return id=IpBMinus;\r | |
121 | case kDs : return id=IpDsPlus;\r | |
122 | case -kDs : return id=IpDsMinus;\r | |
123 | case kDplus : return id=IpDPlus;\r | |
124 | case -kDplus: return id=IpDMinus;\r | |
125 | default : AliFatal(Form("Unknown particle type: %i",iPID)); id=0;\r | |
126 | }\r | |
127 | \r | |
128 | }\r | |
129 | \r | |
130 | return id;\r | |
131 | }\r |