]>
Commit | Line | Data |
---|---|---|
da0e9ce3 | 1 | #include "EvtGenBase/EvtPatches.hh" |
2 | /******************************************************************************* | |
3 | * Project: BaBar detector at the SLAC PEP-II B-factory | |
4 | * Package: EvtGenBase | |
5 | * Author: Denis Dujmic, ddujmic@slac.stanford.edu | |
6 | * | |
7 | * Copyright (C) 2005 SLAC | |
8 | *******************************************************************************/ | |
9 | ||
10 | #include <assert.h> | |
11 | #include <math.h> | |
12 | #include <iostream> | |
13 | #include "EvtGenBase/EvtComplex.hh" | |
14 | #include "EvtGenBase/EvtNonresonantAmp.hh" | |
15 | #include "EvtGenBase/EvtDalitzCoord.hh" | |
16 | #include "EvtGenBase/EvtdFunction.hh" | |
17 | #include "EvtGenBase/EvtCyclic3.hh" | |
18 | using std::endl; | |
19 | using EvtCyclic3::Index; | |
20 | using EvtCyclic3::Pair; | |
21 | ||
22 | ||
23 | EvtNonresonantAmp::EvtNonresonantAmp(EvtDalitzPlot *dp, | |
24 | EvtPto3PAmp::NumType type, | |
25 | EvtCyclic3::Pair pair1, double par1, | |
26 | EvtCyclic3::Pair pair2, double par2, | |
27 | EvtSpinType::spintype spin) : | |
28 | EvtAmplitude<EvtDalitzPoint>(), | |
29 | _type(type), | |
30 | _pair1(pair1), | |
31 | _pair2(pair2), | |
32 | _par1(par1), | |
33 | _par2(par2), | |
34 | _spin(spin) | |
35 | { | |
36 | _dalitzSpace = dp; | |
37 | } | |
38 | ||
39 | ||
40 | ||
41 | EvtNonresonantAmp::EvtNonresonantAmp(const EvtNonresonantAmp& other) : | |
42 | EvtAmplitude<EvtDalitzPoint>(other), | |
43 | _type(other._type), | |
44 | _pair1(other._pair1), | |
45 | _pair2(other._pair2), | |
46 | _par1(other._par1), | |
47 | _par2(other._par2), | |
48 | _spin(other._spin) | |
49 | { | |
50 | _dalitzSpace = other._dalitzSpace; | |
51 | } | |
52 | ||
53 | ||
54 | EvtNonresonantAmp::~EvtNonresonantAmp() {} | |
55 | ||
56 | ||
57 | ||
58 | EvtComplex | |
59 | EvtNonresonantAmp::amplitude(const EvtDalitzPoint &dalitzPoint) const { | |
60 | ||
61 | // flat model | |
62 | if (_type==EvtPto3PAmp::NONRES) { return 1; } | |
63 | ||
64 | // "linear model" (prop. to m^2) | |
65 | else if (_type==EvtPto3PAmp::NONRES_LIN) { | |
66 | return dalitzPoint.q(_pair1); | |
67 | } | |
68 | ||
69 | // Chen-Chua-Soni | |
70 | else if (_type==EvtPto3PAmp::NONRES_CCS) { | |
71 | double s = dalitzPoint.q(_pair1); | |
72 | double smin = _dalitzSpace->qAbsMin(_pair1); | |
73 | return sqrt(s-smin)/(s*log(s*_par1)); | |
74 | } | |
75 | ||
76 | // exp{par*m^2) (Belle model, Garmash et al, PRD71) | |
77 | else if (_type==EvtPto3PAmp::NONRES_EXP) { | |
78 | return exp( _par1*dalitzPoint.q(_pair1) ); | |
79 | } | |
80 | ||
81 | // exp(par1*m12^2 + par2*m13^2) (Belle model, Garmash et al, PRD71) | |
82 | else if (_type==EvtPto3PAmp::NONRES_EXP_ADD) { | |
83 | return exp( _par1*dalitzPoint.q(_pair1) + _par2*dalitzPoint.q(_pair2) ); | |
84 | } | |
85 | ||
86 | // Laura model (P.Harrison et al, BAD806) | |
87 | else if (_type==EvtPto3PAmp::NONRES_LAURA) { | |
88 | double m = sqrt( dalitzPoint.q(_pair1)); | |
89 | double mmin = sqrt(_dalitzSpace->qAbsMin(_pair1)); | |
90 | double dm = m-mmin; | |
91 | assert(dm>0); | |
92 | double cosTh = 1; | |
93 | int ispin = EvtSpinType::getSpin2(_spin); | |
94 | if (ispin>0) { | |
95 | cosTh = dalitzPoint.cosTh( EvtCyclic3::next(_pair1), _pair1); | |
96 | if (ispin>2) cosTh *= cosTh; | |
97 | } | |
98 | return pow(dm,_par1) * exp( dm*_par2 ) * cosTh; | |
99 | } | |
100 | ||
101 | return 0; | |
102 | } |