]>
Commit | Line | Data |
---|---|---|
da0e9ce3 | 1 | //-------------------------------------------------------------------------- |
2 | // | |
3 | // Environment: | |
4 | // This software is part of the EvtGen package developed jointly | |
5 | // for the BaBar and CLEO collaborations. If you use all or part | |
6 | // of it, please give an appropriate acknowledgement. | |
7 | // | |
8 | // Copyright Information: See EvtGen/COPYRIGHT | |
9 | // Copyright (C) 1998 Caltech, UCSB | |
10 | // | |
11 | // Module: EvtFlatQ2.cc | |
12 | // | |
13 | // Description: B->Xu l nu with flat q2 distribution | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // David Cote, U. de Montreal, 11/02/2003 Module created | |
18 | // | |
19 | //------------------------------------------------------------------------ | |
20 | // | |
21 | #include "EvtGenBase/EvtPatches.hh" | |
22 | #include "EvtGenModels/EvtFlatQ2.hh" | |
23 | ||
24 | #include <stdlib.h> | |
25 | #include <fstream> | |
26 | #include <stdio.h> | |
27 | #include <string> | |
28 | #include "EvtGenBase/EvtGenKine.hh" | |
29 | #include "EvtGenBase/EvtParticle.hh" | |
30 | #include "EvtGenBase/EvtPDL.hh" | |
31 | #include "EvtGenBase/EvtReport.hh" | |
32 | #include "EvtGenBase/EvtDiracSpinor.hh" | |
33 | #include "EvtGenBase/EvtVector4C.hh" | |
34 | #include "EvtGenBase/EvtTensor4C.hh" | |
35 | using std::fstream; | |
36 | ||
37 | EvtFlatQ2::~EvtFlatQ2() {} | |
38 | ||
39 | std::string EvtFlatQ2::getName(){ | |
40 | ||
41 | return "FLATQ2"; | |
42 | ||
43 | } | |
44 | ||
45 | EvtDecayBase* EvtFlatQ2::clone(){ | |
46 | ||
47 | return new EvtFlatQ2; | |
48 | ||
49 | } | |
50 | ||
51 | ||
52 | void EvtFlatQ2::initProbMax(){ | |
53 | ||
54 | setProbMax(100); | |
55 | ||
56 | } | |
57 | ||
58 | ||
59 | void EvtFlatQ2::init(){ | |
60 | ||
61 | // check that there are 0 arguments | |
62 | checkNArg(0); | |
63 | checkNDaug(3); | |
64 | ||
65 | //We expect B->X l nu events | |
66 | checkSpinParent(EvtSpinType::SCALAR); | |
67 | checkSpinDaughter(1,EvtSpinType::DIRAC); | |
68 | checkSpinDaughter(2,EvtSpinType::NEUTRINO); | |
69 | ||
70 | } | |
71 | ||
72 | ||
73 | void EvtFlatQ2::decay( EvtParticle *p){ | |
74 | ||
75 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
76 | ||
77 | EvtVector4R p4Xu = p->getDaug(0)->getP4(); | |
78 | double pXu_x2=p4Xu.get(1)*p4Xu.get(1); | |
79 | double pXu_y2=p4Xu.get(2)*p4Xu.get(2); | |
80 | double pXu_z2=p4Xu.get(3)*p4Xu.get(3); | |
81 | double pXu = sqrt(pXu_x2+pXu_y2+pXu_z2); | |
82 | double prob=1/pXu; | |
83 | ||
84 | if(pXu>0.01) setProb(prob); | |
85 | ||
86 | return; | |
87 | } | |
88 | ||
89 |