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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: EvtBHadronic.cc | |
12 | // | |
13 | // Description: Model for hadronic B decays. Uses naive factorization. | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // RYD June 14, 1997 Module created | |
18 | // | |
19 | //------------------------------------------------------------------------ | |
20 | // | |
21 | #include "EvtGenBase/EvtPatches.hh" | |
22 | #include <stdlib.h> | |
23 | #include "EvtGenBase/EvtParticle.hh" | |
24 | #include "EvtGenModels/EvtISGW2FF.hh" | |
25 | #include "EvtGenBase/EvtGenKine.hh" | |
26 | #include "EvtGenBase/EvtPDL.hh" | |
27 | #include "EvtGenModels/EvtISGW2FF.hh" | |
28 | #include "EvtGenBase/EvtTensor4C.hh" | |
29 | #include "EvtGenBase/EvtVector4C.hh" | |
30 | #include "EvtGenBase/EvtVector4R.hh" | |
31 | #include "EvtGenModels/EvtBHadronic.hh" | |
32 | #include "EvtGenBase/EvtReport.hh" | |
33 | #include <string> | |
34 | using std::endl; | |
35 | ||
36 | EvtBHadronic::~EvtBHadronic() {} | |
37 | ||
38 | std::string EvtBHadronic::getName(){ | |
39 | ||
40 | return "BHADRONIC"; | |
41 | ||
42 | } | |
43 | ||
44 | ||
45 | EvtDecayBase* EvtBHadronic::clone(){ | |
46 | ||
47 | return new EvtBHadronic; | |
48 | ||
49 | } | |
50 | ||
51 | ||
52 | void EvtBHadronic::init(){ | |
53 | ||
54 | // check that there are 2 argument | |
55 | checkNArg(2); | |
56 | ||
57 | ||
58 | } | |
59 | ||
60 | void EvtBHadronic::decay( EvtParticle *p){ | |
61 | ||
62 | //added by Lange Jan4,2000 | |
63 | static EvtId B0=EvtPDL::getId("B0"); | |
64 | static EvtId D0=EvtPDL::getId("D0"); | |
65 | static EvtId DST0=EvtPDL::getId("D*0"); | |
66 | static EvtId D3P10=EvtPDL::getId("D'_10"); | |
67 | static EvtId D3P20=EvtPDL::getId("D_2*0"); | |
68 | static EvtId D3P00=EvtPDL::getId("D_0*0"); | |
69 | static EvtId D1P10=EvtPDL::getId("D_10"); | |
70 | ||
71 | static EvtISGW2FF ffmodel; | |
72 | ||
73 | p->initializePhaseSpace(getNDaug(),getDaugs()); | |
74 | ||
75 | EvtVector4R p4[MAX_DAUG]; | |
76 | double m; | |
77 | ||
78 | m = p->mass(); | |
79 | ||
80 | ||
81 | int i,j; | |
82 | ||
83 | for ( i=0; i<getNDaug(); i++) { | |
84 | p4[i]=p->getDaug(i)->getP4(); | |
85 | } | |
86 | ||
87 | int bcurrent,wcurrent; | |
88 | int nbcurrent=0; | |
89 | int nwcurrent=0; | |
90 | ||
91 | bcurrent=(int)getArg(0); | |
92 | wcurrent=(int)getArg(1); | |
93 | ||
94 | EvtVector4C jb[5],jw[5]; | |
95 | EvtTensor4C g,tds; | |
96 | ||
97 | EvtVector4R p4b; | |
98 | p4b.set(p->mass(),0.0,0.0,0.0); | |
99 | ||
100 | EvtVector4R q; | |
101 | double q2; | |
102 | ||
103 | EvtComplex ep_meson_bb[5]; | |
104 | double f,gf,ap,am; | |
105 | double fp,fm; | |
106 | double hf,kf,bp,bm; | |
107 | EvtVector4R pp,pm; | |
108 | EvtVector4C ep_meson_b[5]; | |
109 | ||
110 | switch (bcurrent) { | |
111 | ||
112 | // D0 | |
113 | case 1: | |
114 | q=p4b-p4[0]; | |
115 | q2=q*q; | |
116 | nbcurrent=1; | |
117 | ffmodel.getscalarff(B0,D0,EvtPDL::getMeanMass(D0), | |
118 | EvtPDL::getMeanMass(getDaugs()[1]),&fp,&fm); | |
119 | jb[0]=EvtVector4C(fp*(p4b+p4[0])-fm*q); | |
120 | break; | |
121 | // D* | |
122 | case 2: | |
123 | q=p4b-p4[0]; | |
124 | q2=q*q; | |
125 | nbcurrent=3; | |
126 | ffmodel.getvectorff(B0,DST0,EvtPDL::getMeanMass(DST0),q2,&f,&gf,&ap,&am); | |
127 | ||
128 | g.setdiag(1.0,-1.0,-1.0,-1.0); | |
129 | tds = -f*g | |
130 | -ap*(directProd(p4b,p4b)+directProd(p4b,p4[0])) | |
131 | -gf*EvtComplex(0.0,1.0)*dual(directProd(p4[0]+p4b,p4b-p4[0])) | |
132 | -am*((directProd(p4b,p4b)-directProd(p4b,p4[0]))); | |
133 | jb[0]=tds.cont1(p->getDaug(0)->epsParent(0).conj()); | |
134 | jb[1]=tds.cont1(p->getDaug(0)->epsParent(1).conj()); | |
135 | jb[2]=tds.cont1(p->getDaug(0)->epsParent(2).conj()); | |
136 | break; | |
137 | // D1 | |
138 | case 3: | |
139 | q=p4b-p4[0]; | |
140 | q2=q*q; | |
141 | nbcurrent=3; | |
142 | ffmodel.getvectorff(B0,D3P10,EvtPDL::getMeanMass(D3P10),q2,&f,&gf,&ap,&am); | |
143 | ||
144 | g.setdiag(1.0,-1.0,-1.0,-1.0); | |
145 | tds = -f*g | |
146 | -ap*(directProd(p4b,p4b)+directProd(p4b,p4[0])) | |
147 | -gf*EvtComplex(0.0,1.0)*dual(directProd(p4[0]+p4b,p4b-p4[0])) | |
148 | -am*((directProd(p4b,p4b)-directProd(p4b,p4[0]))); | |
149 | jb[0]=tds.cont1(p->getDaug(0)->epsParent(0).conj()); | |
150 | jb[1]=tds.cont1(p->getDaug(0)->epsParent(1).conj()); | |
151 | jb[2]=tds.cont1(p->getDaug(0)->epsParent(2).conj()); | |
152 | ||
153 | break; | |
154 | // D2* | |
155 | case 4: | |
156 | q=p4b-p4[0]; | |
157 | q2=q*q; | |
158 | nbcurrent=5; | |
159 | ffmodel.gettensorff(B0,D3P20,EvtPDL::getMeanMass(D3P20),q2,&hf,&kf,&bp,&bm); | |
160 | g.setdiag(1.0,-1.0,-1.0,-1.0); | |
161 | ||
162 | ep_meson_b[0] = ((p->getDaug(0)->epsTensorParent(0)).cont2(p4b)).conj(); | |
163 | ep_meson_b[1] = ((p->getDaug(0)->epsTensorParent(1)).cont2(p4b)).conj(); | |
164 | ep_meson_b[2] = ((p->getDaug(0)->epsTensorParent(2)).cont2(p4b)).conj(); | |
165 | ep_meson_b[3] = ((p->getDaug(0)->epsTensorParent(3)).cont2(p4b)).conj(); | |
166 | ep_meson_b[4] = ((p->getDaug(0)->epsTensorParent(4)).cont2(p4b)).conj(); | |
167 | ||
168 | pp=p4b+p4[0]; | |
169 | pm=p4b-p4[0]; | |
170 | ||
171 | ep_meson_bb[0]=ep_meson_b[0]*(p4b); | |
172 | ep_meson_bb[1]=ep_meson_b[1]*(p4b); | |
173 | ep_meson_bb[2]=ep_meson_b[2]*(p4b); | |
174 | ep_meson_bb[3]=ep_meson_b[3]*(p4b); | |
175 | ep_meson_bb[4]=ep_meson_b[4]*(p4b); | |
176 | ||
177 | jb[0]=EvtComplex(0.0,(1.0)*hf)*dual(directProd(pp,pm)).cont2(ep_meson_b[0]) | |
178 | -kf*ep_meson_b[0] | |
179 | -bp*ep_meson_bb[0]*pp-bm*ep_meson_bb[0]*pm; | |
180 | ||
181 | jb[1]=EvtComplex(0.0,(1.0)*hf)*dual(directProd(pp,pm)).cont2(ep_meson_b[1]) | |
182 | -kf*ep_meson_b[1] | |
183 | -bp*ep_meson_bb[1]*pp-bm*ep_meson_bb[1]*pm; | |
184 | ||
185 | jb[2]=EvtComplex(0.0,(1.0)*hf)*dual(directProd(pp,pm)).cont2(ep_meson_b[2]) | |
186 | -kf*ep_meson_b[2] | |
187 | -bp*ep_meson_bb[2]*pp-bm*ep_meson_bb[2]*pm; | |
188 | ||
189 | jb[3]=EvtComplex(0.0,(1.0)*hf)*dual(directProd(pp,pm)).cont2(ep_meson_b[3]) | |
190 | -kf*ep_meson_b[3] | |
191 | -bp*ep_meson_bb[3]*pp-bm*ep_meson_bb[3]*pm; | |
192 | ||
193 | jb[4]=EvtComplex(0.0,(1.0)*hf)*dual(directProd(pp,pm)).cont2(ep_meson_b[4]) | |
194 | -kf*ep_meson_b[4] | |
195 | -bp*ep_meson_bb[4]*pp-bm*ep_meson_bb[4]*pm; | |
196 | break; | |
197 | // D_0* | |
198 | case 5: | |
199 | q=p4b-p4[0]; | |
200 | q2=q*q; | |
201 | double f,gf,ap,am; | |
202 | nbcurrent=3; | |
203 | ffmodel.getvectorff(B0,D1P10,EvtPDL::getMeanMass(D1P10),q2,&f,&gf,&ap,&am); | |
204 | g.setdiag(1.0,-1.0,-1.0,-1.0); | |
205 | tds = -f*g | |
206 | -ap*(directProd(p4b,p4b)+directProd(p4b,p4[0])) | |
207 | +gf*EvtComplex(0.0,1.0)*dual(directProd(p4[0]+p4b,p4b-p4[0])) | |
208 | -am*((directProd(p4b,p4b)-directProd(p4b,p4[0]))); | |
209 | jb[0]=tds.cont1(p->getDaug(0)->epsParent(0).conj()); | |
210 | jb[1]=tds.cont1(p->getDaug(0)->epsParent(1).conj()); | |
211 | jb[2]=tds.cont1(p->getDaug(0)->epsParent(2).conj()); | |
212 | break; | |
213 | // D_1 | |
214 | case 6: | |
215 | q=p4b-p4[0]; | |
216 | q2=q*q; | |
217 | nbcurrent=1; | |
218 | ffmodel.getscalarff(B0,D3P00,EvtPDL::getMeanMass(D3P00),q2,&fp,&fm); | |
219 | jb[0]=fp*(p4b+p4[0])+fm*q; | |
220 | break; | |
221 | default: | |
222 | report(ERROR,"EvtGen")<<"In EvtBHadronic, unknown hadronic current."<<endl; | |
223 | ||
224 | } | |
225 | ||
226 | double norm; | |
227 | ||
228 | switch (wcurrent) { | |
229 | ||
230 | ||
231 | case 1: case 3: case 4: | |
232 | nwcurrent=1; | |
233 | jw[0]=p4[getNDaug()-1]; | |
234 | break; | |
235 | ||
236 | case 2: case 5: case 6: | |
237 | nwcurrent=3; | |
238 | norm=1.0/sqrt(p4[1].get(0)*p4[1].get(0)/p4[1].mass2()-1.0); | |
239 | jw[0]=norm*p->getDaug(getNDaug()-1)->epsParent(0); | |
240 | jw[1]=norm*p->getDaug(getNDaug()-1)->epsParent(1); | |
241 | jw[2]=norm*p->getDaug(getNDaug()-1)->epsParent(2); | |
242 | break; | |
243 | ||
244 | ||
245 | default: | |
246 | report(ERROR,"EvtGen")<<"In EvtBHadronic, unknown W current."<<endl; | |
247 | ||
248 | } | |
249 | ||
250 | if (nbcurrent==1&&nwcurrent==1){ | |
251 | vertex(jb[0]*jw[0]); | |
252 | return; | |
253 | } | |
254 | ||
255 | if (nbcurrent==1){ | |
256 | for(j=0;j<nwcurrent;j++){ | |
257 | vertex(j,jb[0]*jw[j]); | |
258 | } | |
259 | return; | |
260 | } | |
261 | ||
262 | if (nwcurrent==1){ | |
263 | for(j=0;j<nbcurrent;j++){ | |
264 | vertex(j,jb[j]*jw[0]); | |
265 | } | |
266 | return; | |
267 | } | |
268 | ||
269 | for(j=0;j<nbcurrent;j++){ | |
270 | for(i=0;i<nwcurrent;i++){ | |
271 | vertex(j,i,jb[j]*jw[i]); | |
272 | } | |
273 | } | |
274 | return; | |
275 | ||
276 | } | |
277 | ||
278 | ||
279 | ||
280 | ||
281 | ||
282 | ||
283 |