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0ca57c2f | 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: EvtXPsiGamma.cc | |
12 | // | |
13 | // Description: Routine to implement radiative decay X3872(2-+) -> J/psi gamma | |
14 | // according to [F. Brazzi et al, arXiv:1103.3155 | |
15 | // | |
16 | // Modification history: | |
17 | // | |
18 | // May, 7, 2012 Module created | |
19 | // | |
20 | //------------------------------------------------------------------------ | |
21 | // | |
22 | #include "EvtGenBase/EvtPatches.hh" | |
23 | #include <stdlib.h> | |
24 | #include "EvtGenBase/EvtParticle.hh" | |
25 | #include "EvtGenBase/EvtTensorParticle.hh" | |
26 | #include "EvtGenBase/EvtGenKine.hh" | |
27 | #include "EvtGenBase/EvtPDL.hh" | |
28 | #include "EvtGenBase/EvtReport.hh" | |
29 | #include "EvtGenBase/EvtVector4C.hh" | |
30 | #include "EvtGenBase/EvtTensor4C.hh" | |
31 | ||
32 | #include "EvtGenModels/EvtXPsiGamma.hh" | |
33 | ||
34 | #include <string> | |
35 | #include <iostream> | |
36 | ||
37 | using namespace std; | |
38 | ||
39 | EvtXPsiGamma::~EvtXPsiGamma() { | |
40 | /* cout<<"(* AVL EvtXPsiGamma::destructor getProbMax(-1) = "<<getProbMax(-1)<<" *)"<<endl; | |
41 | cout<<"(* AVL EvtXPsiGamma::destructor "<<ncall<<" calls *)"<<endl;*/ | |
42 | } | |
43 | ||
44 | std::string EvtXPsiGamma::getName(){ | |
45 | return "X38722-+_PSI_GAMMA"; | |
46 | } | |
47 | ||
48 | ||
49 | EvtDecayBase* EvtXPsiGamma::clone(){ | |
50 | // cout<<" (* AVL: === EvtXPsiGamma::clone() ============ *)"<<endl; | |
51 | return new EvtXPsiGamma; | |
52 | ||
53 | } | |
54 | ||
55 | EvtComplex EvtXPsiGamma::fT2(EvtVector4R p, EvtVector4R q , EvtTensor4C epsPI, EvtVector4C epsEps, EvtVector4C epsEta) { | |
56 | // T2 term from [Bazi](10) | |
57 | EvtTensor4C epsPQ = EvtGenFunctions::directProd(q,p); // e_{mu nu a b} p^a q^b; | |
58 | epsPQ = dual(epsPQ); | |
59 | ||
60 | EvtVector4C tmp1 = epsPI.cont1(epsEps); | |
61 | EvtVector4C tmp2=epsPQ.cont1(tmp1); | |
62 | EvtComplex T2 = tmp2*epsEta; // epa^a pi_{a mu} e_{mu nu rho si} p_nu q_rho eta_si | |
63 | ||
64 | tmp1 = epsPI.cont1(epsEta); | |
65 | tmp2=epsPQ.cont1(tmp1); | |
66 | T2+=tmp2*epsEps; // T2 - eta^a pi_{a mu} e_{mu nu rho si} q_nu p_rhi eps_si | |
67 | ||
68 | return T2; | |
69 | } | |
70 | ||
71 | EvtComplex EvtXPsiGamma::fT3(EvtVector4R p, EvtVector4R q , EvtTensor4C epsPI, EvtVector4C epsEps, EvtVector4C epsEta) { | |
72 | // T3 term from [Bazi](11) | |
73 | EvtVector4R Q = p-q, P = p+q; | |
74 | EvtVector4C tmp1 = epsPI.cont1(Q); // Q_a pi_{a mu} | |
75 | EvtTensor4C tmp3 = dual(EvtGenFunctions::directProd(P,epsEps)); // e_{mu nu rho si} P^rho eps^si | |
76 | EvtVector4C tmp4 = tmp3.cont1(tmp1); | |
77 | EvtComplex T3 = tmp4*epsEta; // Q_a pi_{a mu} e_{mu nu rho si} P^rho eps_si eta_nu | |
78 | return T3; | |
79 | } | |
80 | ||
81 | ||
82 | void EvtXPsiGamma::decay( EvtParticle *root ){ | |
83 | ncall++; | |
84 | root -> initializePhaseSpace(getNDaug(),getDaugs()); | |
85 | ||
86 | double gOmega = 1.58, gPOmega = -0.74; // X -> omega psi couplings from table II | |
87 | double gRho = 1.58, gPRho = -0.74; // X -> omega psi couplings from table II | |
88 | double fRho=0.121, mRho2 = 0.770*0.770, fOmega=0.036, mOmega2 = 0.782*0.782; | |
89 | ||
90 | EvtComplex amp; | |
91 | ||
92 | if(_ID0 == EvtPDL::getId("gamma") ) { | |
93 | for(int iPsi = 0; iPsi < 4; iPsi++) { | |
94 | for(int iGamma = 0; iGamma < 1; iGamma++) { | |
95 | for(int iChi = 0; iChi<4; iChi++) { | |
96 | ||
97 | EvtComplex T2 = fT2( | |
98 | root->getDaug(1)->getP4(), | |
99 | root->getDaug(0)->getP4(), | |
100 | root->epsTensor(iChi), | |
101 | root->getDaug(1)->epsParent(iPsi).conj(), | |
102 | root->getDaug(0)->epsParentPhoton(iGamma).conj() | |
103 | ); | |
104 | EvtComplex T3 = fT3( | |
105 | root->getDaug(1)->getP4(), | |
106 | root->getDaug(0)->getP4(), | |
107 | root->epsTensor(iChi), | |
108 | root->getDaug(1)->epsParent(iPsi).conj(), | |
109 | root->getDaug(0)->epsParentPhoton(iGamma).conj() | |
110 | ); | |
111 | amp = (fOmega/mOmega2*gOmega+fRho/mRho2*gRho)*T2 | |
112 | + (fOmega/mOmega2*gPOmega+fRho/mRho2*gPRho)*T3; | |
113 | vertex(iChi, iGamma, iPsi, amp); | |
114 | };};}; | |
115 | } | |
116 | else if(_ID0 == EvtPDL::getId("omega") ) { | |
117 | for(int iPsi = 0; iPsi < 4; iPsi++) { | |
118 | for(int iGamma = 0; iGamma < 4; iGamma++) { | |
119 | for(int iChi = 0; iChi<4; iChi++) { | |
120 | ||
121 | EvtComplex T2 = fT2( | |
122 | root->getDaug(1)->getP4(), | |
123 | root->getDaug(0)->getP4(), | |
124 | root->epsTensor(iChi), | |
125 | root->getDaug(1)->epsParent(iPsi).conj(), | |
126 | root->getDaug(0)->epsParent(iGamma).conj() | |
127 | ); | |
128 | EvtComplex T3 = fT3( | |
129 | root->getDaug(1)->getP4(), | |
130 | root->getDaug(0)->getP4(), | |
131 | root->epsTensor(iChi), | |
132 | root->getDaug(1)->epsParent(iPsi).conj(), | |
133 | root->getDaug(0)->epsParent(iGamma).conj() | |
134 | ); | |
135 | // cout << "AVL:: omega"<<endl; | |
136 | amp = gOmega*T2 + gPOmega*T3; | |
137 | vertex(iChi, iGamma, iPsi, amp); | |
138 | };};}; | |
139 | } | |
140 | else if(_ID0 == EvtPDL::getId("rho0") ) { | |
141 | for(int iPsi = 0; iPsi < 4; iPsi++) { | |
142 | for(int iGamma = 0; iGamma < 4; iGamma++) { | |
143 | for(int iChi = 0; iChi<4; iChi++) { | |
144 | ||
145 | EvtComplex T2 = fT2( | |
146 | root->getDaug(1)->getP4(), | |
147 | root->getDaug(0)->getP4(), | |
148 | root->epsTensor(iChi), | |
149 | root->getDaug(1)->epsParent(iPsi).conj(), | |
150 | root->getDaug(0)->epsParent(iGamma).conj() | |
151 | ); | |
152 | EvtComplex T3 = fT3( | |
153 | root->getDaug(1)->getP4(), | |
154 | root->getDaug(0)->getP4(), | |
155 | root->epsTensor(iChi), | |
156 | root->getDaug(1)->epsParent(iPsi).conj(), | |
157 | root->getDaug(0)->epsParent(iGamma).conj() | |
158 | ); | |
159 | // cout << "AVL:: rho"<<endl; | |
160 | amp = gRho*T2 + gPRho*T3; | |
161 | vertex(iChi, iGamma, iPsi, amp); | |
162 | };};}; | |
163 | } | |
164 | else { | |
165 | cout<<"AVL:: Not realized yet"<<endl; | |
166 | }; | |
167 | ||
168 | } | |
169 | ||
170 | ||
171 | void EvtXPsiGamma::init(){ | |
172 | // cout<<" (* AVL: ==== EvtXPsiGamma::init() ============ *)"<<endl; | |
173 | ||
174 | ncall = 0; | |
175 | ||
176 | checkNArg(0); | |
177 | checkNDaug(2); | |
178 | ||
179 | ||
180 | checkSpinParent(EvtSpinType::TENSOR); | |
181 | ||
182 | // checkSpinDaughter(0,EvtSpinType::PHOTON); | |
183 | checkSpinDaughter(1,EvtSpinType::VECTOR); | |
184 | ||
185 | _ID0 = getDaug(0); | |
186 | /* if(_ID0 == EvtPDL::getId("gamma") ) { | |
187 | cout << "AVL:: gamma"<<endl; | |
188 | } | |
189 | else if(_ID0 == EvtPDL::getId("omega") ) { | |
190 | cout << "AVL:: omega"<<endl; | |
191 | } | |
192 | else if(_ID0 == EvtPDL::getId("rho0") ) { | |
193 | cout << "AVL:: rho"<<endl; | |
194 | }; | |
195 | */ | |
196 | ||
197 | } | |
198 | ||
199 | void EvtXPsiGamma::initProbMax() { | |
200 | if(_ID0 == EvtPDL::getId("gamma") ) setProbMax(2.400); | |
201 | else if(_ID0 == EvtPDL::getId("omega") ) setProbMax(16.); | |
202 | else if(_ID0 == EvtPDL::getId("rho0") ) setProbMax(70.); | |
203 | }; | |
204 | ||
205 |