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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: EvtLineShape.cc | |
12 | // | |
13 | // Description: Store particle properties for one particle. | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // Lange March 10, 2001 Module created | |
18 | // Dvoretskii June 03, 2002 Reimplemented rollMass() | |
19 | // | |
20 | //------------------------------------------------------------------------ | |
21 | #include "EvtGenBase/EvtPatches.hh" | |
22 | ||
23 | #include "EvtGenBase/EvtPatches.hh" | |
24 | ||
25 | #include "EvtGenBase/EvtPredGen.hh" | |
26 | ||
27 | #include "EvtGenBase/EvtRelBreitWignerBarrierFact.hh" | |
28 | #include "EvtGenBase/EvtTwoBodyVertex.hh" | |
29 | #include "EvtGenBase/EvtPropBreitWignerRel.hh" | |
30 | #include "EvtGenBase/EvtPDL.hh" | |
31 | #include "EvtGenBase/EvtAmpPdf.hh" | |
32 | #include "EvtGenBase/EvtMassAmp.hh" | |
33 | #include "EvtGenBase/EvtSpinType.hh" | |
34 | #include "EvtGenBase/EvtIntervalFlatPdf.hh" | |
35 | #include <algorithm> | |
36 | EvtRelBreitWignerBarrierFact::EvtRelBreitWignerBarrierFact() { | |
37 | ||
38 | } | |
39 | ||
40 | EvtRelBreitWignerBarrierFact::~EvtRelBreitWignerBarrierFact() { | |
41 | } | |
42 | ||
43 | EvtRelBreitWignerBarrierFact::EvtRelBreitWignerBarrierFact(double mass, double width, double maxRange, EvtSpinType::spintype sp) : | |
44 | EvtAbsLineShape(mass,width,maxRange,sp) | |
45 | { // double mDaug1, double mDaug2, int l) { | |
46 | ||
47 | _includeDecayFact=true; | |
48 | _includeBirthFact=true; | |
49 | _mass=mass; | |
50 | _width=width; | |
51 | _spin=sp; | |
52 | _blatt=3.0; | |
53 | _maxRange=maxRange; | |
54 | _errorCond=false; | |
55 | ||
56 | double maxdelta = 15.0*width; | |
57 | ||
58 | if ( maxRange > 0.00001 ) { | |
59 | _massMax=mass+maxdelta; | |
60 | _massMin=mass-maxRange; | |
61 | } | |
62 | else{ | |
63 | _massMax=mass+maxdelta; | |
64 | _massMin=mass-15.0*width; | |
65 | } | |
66 | ||
67 | _massMax=mass+maxdelta; | |
68 | if ( _massMin< 0. ) _massMin=0.; | |
69 | } | |
70 | ||
71 | EvtRelBreitWignerBarrierFact::EvtRelBreitWignerBarrierFact(const EvtRelBreitWignerBarrierFact& x) : | |
72 | EvtAbsLineShape(x) | |
73 | { | |
74 | _massMax=x._massMax; | |
75 | _massMin=x._massMin; | |
76 | _blatt=x._blatt; | |
77 | _maxRange=x._maxRange; | |
78 | _includeDecayFact=x._includeDecayFact; | |
79 | _includeBirthFact=x._includeBirthFact; | |
80 | _errorCond=x._errorCond; | |
81 | ||
82 | } | |
83 | ||
84 | EvtRelBreitWignerBarrierFact& EvtRelBreitWignerBarrierFact::operator=(const EvtRelBreitWignerBarrierFact& x) { | |
85 | _mass=x._mass; | |
86 | _width=x._width; | |
87 | _spin=x._spin; | |
88 | _massMax=x._massMax; | |
89 | _massMin=x._massMin; | |
90 | _blatt=x._blatt; | |
91 | _maxRange=x._maxRange; | |
92 | _includeDecayFact=x._includeDecayFact; | |
93 | _includeBirthFact=x._includeBirthFact; | |
94 | _errorCond=x._errorCond; | |
95 | ||
96 | return *this; | |
97 | } | |
98 | ||
99 | EvtAbsLineShape* EvtRelBreitWignerBarrierFact::clone() { | |
100 | ||
101 | return new EvtRelBreitWignerBarrierFact(*this); | |
102 | } | |
103 | ||
104 | ||
105 | double EvtRelBreitWignerBarrierFact::getMassProb(double mass, double massPar,int nDaug, double *massDau) { | |
106 | ||
107 | _errorCond=false; | |
108 | //return EvtAbsLineShape::getMassProb(mass,massPar,nDaug,massDau); | |
109 | if (nDaug!=2) return EvtAbsLineShape::getMassProb(mass,massPar,nDaug,massDau); | |
110 | ||
111 | double dTotMass=0.; | |
112 | ||
113 | int i; | |
114 | for (i=0; i<nDaug; i++) { | |
115 | dTotMass+=massDau[i]; | |
116 | } | |
117 | //report(INFO,"EvtGen") << mass << " " << massPar << " " << dTotMass << " "<< endl; | |
118 | // if ( (mass-dTotMass)<0.0001 ) return 0.; | |
119 | //report(INFO,"EvtGen") << mass << " " << dTotMass << endl; | |
120 | if ( (mass<dTotMass) ) return 0.; | |
121 | ||
122 | if ( _width< 0.0001) return 1.; | |
123 | ||
124 | if ( massPar>0.0000000001 ) { | |
125 | if ( mass > massPar) return 0.; | |
126 | } | |
127 | ||
128 | if ( _errorCond ) return 0.; | |
129 | ||
130 | // we did all the work in getRandMass | |
131 | return 1.; | |
132 | } | |
133 | ||
134 | double EvtRelBreitWignerBarrierFact::getRandMass(EvtId *parId,int nDaug, EvtId *dauId, EvtId *othDaugId, double maxMass, double *dauMasses) { | |
135 | if ( nDaug!=2) return EvtAbsLineShape::getRandMass(parId,nDaug,dauId,othDaugId,maxMass,dauMasses); | |
136 | ||
137 | if ( _width< 0.00001) return _mass; | |
138 | ||
139 | //first figure out L - take the lowest allowed. | |
140 | ||
141 | EvtSpinType::spintype spinD1=EvtPDL::getSpinType(dauId[0]); | |
142 | EvtSpinType::spintype spinD2=EvtPDL::getSpinType(dauId[1]); | |
143 | ||
144 | int t1=EvtSpinType::getSpin2(spinD1); | |
145 | int t2=EvtSpinType::getSpin2(spinD2); | |
146 | int t3=EvtSpinType::getSpin2(_spin); | |
147 | ||
148 | int Lmin=-10; | |
149 | ||
150 | ||
151 | // the user has overridden the partial wave to use. | |
152 | for (unsigned int vC=0; vC<_userSetPW.size(); vC++) { | |
153 | if ( dauId[0]==_userSetPWD1[vC] && dauId[1]==_userSetPWD2[vC] ) { | |
154 | Lmin=2*_userSetPW[vC]; | |
155 | } | |
156 | if ( dauId[0]==_userSetPWD2[vC] && dauId[1]==_userSetPWD1[vC] ) { | |
157 | Lmin=2*_userSetPW[vC]; | |
158 | } | |
159 | } | |
160 | ||
161 | // allow for special cases. | |
162 | if (Lmin<-1 ) { | |
163 | ||
164 | //There are some things I don't know how to deal with | |
165 | if ( t3>4) return EvtAbsLineShape::getRandMass(parId,nDaug,dauId,othDaugId,maxMass,dauMasses); | |
166 | if ( t1>4) return EvtAbsLineShape::getRandMass(parId,nDaug,dauId,othDaugId,maxMass,dauMasses); | |
167 | if ( t2>4) return EvtAbsLineShape::getRandMass(parId,nDaug,dauId,othDaugId,maxMass,dauMasses); | |
168 | ||
169 | //figure the min and max allowwed "spins" for the daughters state | |
170 | Lmin=std::max(t3-t2-t1,std::max(t2-t3-t1,t1-t3-t2)); | |
171 | if (Lmin<0) Lmin=0; | |
172 | assert(Lmin==0||Lmin==2||Lmin==4); | |
173 | } | |
174 | ||
175 | //double massD1=EvtPDL::getMeanMass(dauId[0]); | |
176 | //double massD2=EvtPDL::getMeanMass(dauId[1]); | |
177 | double massD1=dauMasses[0]; | |
178 | double massD2=dauMasses[1]; | |
179 | ||
180 | // I'm not sure how to define the vertex factor here - so retreat to nonRel code. | |
181 | if ( (massD1+massD2)> _mass ) return EvtAbsLineShape::getRandMass(parId,nDaug,dauId,othDaugId,maxMass,dauMasses); | |
182 | ||
183 | //parent vertex factor not yet implemented | |
184 | double massOthD=-10.; | |
185 | double massParent=-10.; | |
186 | int birthl=-10; | |
187 | if ( othDaugId) { | |
188 | EvtSpinType::spintype spinOth=EvtPDL::getSpinType(*othDaugId); | |
189 | EvtSpinType::spintype spinPar=EvtPDL::getSpinType(*parId); | |
190 | ||
191 | int tt1=EvtSpinType::getSpin2(spinOth); | |
192 | int tt2=EvtSpinType::getSpin2(spinPar); | |
193 | int tt3=EvtSpinType::getSpin2(_spin); | |
194 | ||
195 | ||
196 | //figure the min and max allowwed "spins" for the daughters state | |
197 | if ( (tt1<=4) && ( tt2<=4) ) { | |
198 | birthl=std::max(tt3-tt2-tt1,std::max(tt2-tt3-tt1,tt1-tt3-tt2)); | |
199 | if (birthl<0) birthl=0; | |
200 | ||
201 | massOthD=EvtPDL::getMeanMass(*othDaugId); | |
202 | massParent=EvtPDL::getMeanMass(*parId); | |
203 | ||
204 | } | |
205 | ||
206 | // allow user to override | |
207 | for (size_t vC=0; vC<_userSetBirthPW.size(); vC++) { | |
208 | if ( *othDaugId==_userSetBirthOthD[vC] && *parId==_userSetBirthPar[vC]){ | |
209 | birthl=2*_userSetBirthPW[vC]; | |
210 | } | |
211 | } | |
212 | ||
213 | } | |
214 | double massM=_massMax; | |
215 | if ( (maxMass > -0.5) && (maxMass < massM) ) massM=maxMass; | |
216 | ||
217 | //special case... if the parent mass is _fixed_ we can do a little better | |
218 | //and only for a two body decay as that seems to be where we have problems | |
219 | ||
220 | // Define relativistic propagator amplitude | |
221 | ||
222 | EvtTwoBodyVertex vd(massD1,massD2,_mass,Lmin/2); | |
223 | vd.set_f(_blatt); | |
224 | EvtPropBreitWignerRel bw(_mass,_width); | |
225 | EvtMassAmp amp(bw,vd); | |
226 | ||
227 | if ( _includeDecayFact) { | |
228 | amp.addDeathFact(); | |
229 | amp.addDeathFactFF(); | |
230 | } | |
231 | if ( massParent>-1.) { | |
232 | if ( _includeBirthFact ) { | |
233 | ||
234 | EvtTwoBodyVertex vb(_mass,massOthD,massParent,birthl/2); | |
235 | //whoops 060116 | |
236 | //needed to actually tell the vertex about the form factor! | |
237 | //otherwise its just 1 | |
238 | if ( _applyFixForSP8 ) vb.set_f(_blatt); | |
239 | amp.setBirthVtx(vb); | |
240 | amp.addBirthFact(); | |
241 | amp.addBirthFactFF(); | |
242 | } | |
243 | } | |
244 | ||
245 | ||
246 | EvtAmpPdf<EvtPoint1D> pdf(amp); | |
247 | ||
248 | // Estimate maximum and create predicate for accept reject | |
249 | ||
250 | ||
251 | double tempMaxLoc=_mass; | |
252 | if ( maxMass>-0.5 && maxMass<_mass) tempMaxLoc=maxMass; | |
253 | double tempMax=_massMax; | |
254 | if ( maxMass>-0.5 && maxMass<_massMax) tempMax=maxMass; | |
255 | double tempMinMass=_massMin; | |
256 | if ( massD1+massD2 > _massMin) tempMinMass=massD1+massD2; | |
257 | ||
258 | //redo sanity check - is there a solution to our problem. | |
259 | //if not return an error condition that is caught by the | |
260 | //mass prob calculation above. | |
261 | if ( tempMinMass > tempMax ) { | |
262 | _errorCond=true; | |
263 | return tempMinMass; | |
264 | } | |
265 | ||
266 | if ( tempMaxLoc < tempMinMass) tempMaxLoc=tempMinMass; | |
267 | ||
268 | double safetyFactor=1.2; | |
269 | if ( _applyFixForSP8 ) safetyFactor=1.4; | |
270 | ||
271 | EvtPdfMax<EvtPoint1D> max(safetyFactor*pdf.evaluate(EvtPoint1D(tempMinMass,tempMax,tempMaxLoc))); | |
272 | ||
273 | EvtPdfPred<EvtPoint1D> pred(pdf); | |
274 | pred.setMax(max); | |
275 | ||
276 | EvtIntervalFlatPdf flat(tempMinMass,tempMax); | |
277 | EvtPdfGen<EvtPoint1D> gen(flat); | |
278 | EvtPredGen<EvtPdfGen<EvtPoint1D>,EvtPdfPred<EvtPoint1D> > predgen(gen,pred); | |
279 | ||
280 | EvtPoint1D point = predgen(); | |
281 | return point.value(); | |
282 | ||
283 | } | |
284 | ||
285 | ||
286 | ||
287 | ||
288 | ||
289 | ||
290 | ||
291 | ||
292 |