BOSS 7.1.0
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EvtDToKSKSpi.cc
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1//--------------------------------------------------------------------------
2// Environment:
3// This software is part of models developed at BES collaboration
4// based on the EvtGen framework. If you use all or part
5// of it, please give an appropriate acknowledgement.
6//
7// Copyright Information: See EvtGen/BesCopyright
8// Copyright (A) 2006 Ping Rong-Gang @IHEP
9//
10// Module: EvtDToKSKSpi.cc
11//
12// Description: D+ -> KS0 KS0 pi+, See https://indico.ihep.ac.cn/event/17068/contributions/121739/attachments/65534/77195/Zhoushuai.pdf
13//
14// Modification history:
15//
16// Liaoyuan Dong Wed Nov 9 00:25:20 2022 Module created
17//------------------------------------------------------------------------
18#include "EvtGenBase/EvtPatches.hh"
19#include "EvtGenBase/EvtParticle.hh"
20#include "EvtGenBase/EvtGenKine.hh"
21#include "EvtGenBase/EvtPDL.hh"
22#include "EvtGenBase/EvtReport.hh"
23#include "EvtGenModels/EvtDToKSKSpi.hh"
24#include "EvtGenBase/EvtComplex.hh"
25#include "EvtGenBase/EvtDecayTable.hh"
26#include <stdlib.h>
27#include <iostream>
28#include <cmath>
29using namespace std;
30
31EvtDToKSKSpi::~EvtDToKSKSpi() {}
32
33void EvtDToKSKSpi::getName(std::string& model_name){
34 model_name="DToKSKSpi";
35}
36
37EvtDecayBase* EvtDToKSKSpi::clone(){
38 return new EvtDToKSKSpi;
39}
40
41void EvtDToKSKSpi::init(){
42 checkNArg(0);
43 checkNDaug(3);
44 checkSpinParent(EvtSpinType::SCALAR);
45
46 mass[0] = 0.89167;//KpiSW
47 mass[1] = 0.89167;//K*892
48 width[0] = 0.05140;//KpiSW
49 width[1] = 0.05140;//K*892
50
51 rho[0] = 0.964140442071117;//KpiSW
52 rho[1] = 1;//K*892
53 phi[0] = -3.654242163321078;//KpiSW
54 phi[1] = 0;//K*892
55
56 spin[0] = 0; //KpiSW
57 spin[1] = 1; //K*892
58 modetype[0] = 13;//KpiSW
59 modetype[1] = 13;//K*892
60
61 //std::cout << "Initializing EvtDToKSKSpi" << std::endl;
62 //for (int i=0; i<2; i++) {
63 // cout << i << " rho,phi = " << rho[i] << ", "<< phi[i] << endl;
64 //}
65
66 math_pi = 3.1415926;
67 GS1 = 0.636619783;
68 GS2 = 0.01860182466;
69 GS3 = 0.1591549458; // 1/(2*math_2pi)
70 GS4 = 0.00620060822; // mass_Pion2/math_pi
71
72}
73
74void EvtDToKSKSpi::initProbMax() {
75 setProbMax(354.0);
76}
77
78void EvtDToKSKSpi::decay( EvtParticle *p){
79/*
80 double maxprob = 0.0;
81 for(int ir=0;ir<=60000000;ir++){
82 p->initializePhaseSpace(getNDaug(),getDaugs());
83 EvtVector4R D1 = p->getDaug(0)->getP4();
84 EvtVector4R D2 = p->getDaug(1)->getP4();
85 EvtVector4R D3 = p->getDaug(2)->getP4();
86
87 double P1[4], P2[4], P3[4];
88 P1[0] = D1.get(0); P1[1] = D1.get(1); P1[2] = D1.get(2); P1[3] = D1.get(3);
89 P2[0] = D2.get(0); P2[1] = D2.get(1); P2[2] = D2.get(2); P2[3] = D2.get(3);
90 P3[0] = D3.get(0); P3[1] = D3.get(1); P3[2] = D3.get(2); P3[3] = D3.get(3);
91
92 double value;
93 int g0[2]={12,1};
94 int spin[2]={0,1};
95 int nstates=2;
96 calEva(P1, P2, P3, mass, width, rho, phi, g0, spin, modetype, nstates, value);
97 if (value<0) continue;
98 if(value>maxprob) {
99 maxprob=value;
100 cout << "ir= " << ir << endl;
101 cout << "double P1[4] = {" << P1[0] <<","<< P1[1] <<","<< P1[2] <<","<< P1[3] <<"};"<< endl;
102 cout << "double P2[4] = {" << P2[0] <<","<< P2[1] <<","<< P2[2] <<","<< P2[3] <<"};"<< endl;
103 cout << "double P3[4] = {" << P3[0] <<","<< P3[1] <<","<< P3[2] <<","<< P3[3] <<"};"<< endl;
104 cout << "MAX====> " << maxprob << endl;
105 }
106 }
107 printf("MAXprob = %.10f\n",maxprob);
108*/
109
110 p->initializePhaseSpace(getNDaug(),getDaugs());
111 EvtVector4R D1 = p->getDaug(0)->getP4();
112 EvtVector4R D2 = p->getDaug(1)->getP4();
113 EvtVector4R D3 = p->getDaug(2)->getP4();
114
115 double P1[4], P2[4], P3[4];
116 P1[0] = D1.get(0); P1[1] = D1.get(1); P1[2] = D1.get(2); P1[3] = D1.get(3);
117 P2[0] = D2.get(0); P2[1] = D2.get(1); P2[2] = D2.get(2); P2[3] = D2.get(3);
118 P3[0] = D3.get(0); P3[1] = D3.get(1); P3[2] = D3.get(2); P3[3] = D3.get(3);
119
120 double value;
121 int g0[2]={12,1};
122 int spin[2]={0,1};
123 int nstates=2;
124 calEva(P1, P2, P3, mass, width, rho, phi, g0, spin, modetype, nstates, value);
125 setProb(value);
126
127 return ;
128}
129
130void EvtDToKSKSpi::Com_Multi(double a1[2], double a2[2], double res[2])
131{
132 res[0] = a1[0]*a2[0]-a1[1]*a2[1];
133 res[1] = a1[1]*a2[0]+a1[0]*a2[1];
134}
135void EvtDToKSKSpi::Com_Divide(double a1[2], double a2[2], double res[2])
136{
137 double tmp = a2[0]*a2[0]+a2[1]*a2[1];
138 res[0] = (a1[0]*a2[0]+a1[1]*a2[1])/tmp;
139 res[1] = (a1[1]*a2[0]-a1[0]*a2[1])/tmp;
140}
141//------------base---------------------------------
142double EvtDToKSKSpi::SCADot(double a1[4], double a2[4])
143{
144 double _cal = a1[0]*a2[0]-a1[1]*a2[1]-a1[2]*a2[2]-a1[3]*a2[3];
145 return _cal;
146}
147double EvtDToKSKSpi::barrier(int l, double sa, double sb, double sc, double r, double mass)
148{
149 double q = (sa+sb-sc)*(sa+sb-sc)/(4*sa)-sb;
150 if(q < 0) q = 1e-16;
151 double z;
152 z = q*r*r;
153 double sa0;
154 sa0 = mass*mass;
155 double q0 = (sa0+sb-sc)*(sa0+sb-sc)/(4*sa0)-sb;
156 if(q0 < 0) q0 = 1e-16;
157 double z0 = q0*r*r;
158 double F = 0.0;
159 if(l == 0) F = 1;
160 if(l == 1) F = sqrt((1+z0)/(1+z));
161 if(l == 2) F = sqrt((9+3*z0+z0*z0)/(9+3*z+z*z));
162 return F;
163}
164
165void EvtDToKSKSpi::calt1(double daug1[4], double daug2[4], double t1[4])
166{
167 double p, pq, tmp;
168 double pa[4], qa[4];
169 for(int i=0; i<4; i++) {
170 pa[i] = daug1[i] + daug2[i];
171 qa[i] = daug1[i] - daug2[i];
172 }
173 p = SCADot(pa,pa);
174 pq = SCADot(pa,qa);
175 tmp = pq/p;
176 for(int i=0; i<4; i++) {
177 t1[i] = qa[i] - tmp*pa[i];
178 }
179}
180
181void EvtDToKSKSpi::calt2(double daug1[4], double daug2[4], double t2[4][4])
182{
183 double p, r;
184 double pa[4], t1[4];
185 calt1(daug1,daug2,t1);
186 r = SCADot(t1,t1)/3.0;
187 for(int i=0; i<4; i++) {
188 pa[i] = daug1[i] + daug2[i];
189 }
190 p = SCADot(pa,pa);
191 for(int i=0; i<4; i++) {
192 for(int j=0; j<4; j++) {
193 t2[i][j] = t1[i]*t1[j] - r*(G[i][j]-pa[i]*pa[j]/p);
194 }
195 }
196}
197
198double EvtDToKSKSpi::wid(double mass2, double mass, double sa, double sb, double sc, double r2, int l)
199{
200 double widm = 0.;
201 double m = sqrt(sa);
202 double tmp = sb-sc;
203 double tmp1 = sa+tmp;
204 double q = 0.25*tmp1*tmp1/sa-sb;
205 if(q<0) q = 1e-16;
206 double tmp2 = mass2+tmp;
207 double q0 = 0.25*tmp2*tmp2/mass2-sb;
208 if(q0<0) q0 = 1e-16;
209 double z = q*r2;
210 double z0 = q0*r2;
211 double t = q/q0;
212 if(l == 0) {widm = sqrt(t)*mass/m;}
213 else if(l == 1) {widm = t*sqrt(t)*mass/m*(1+z0)/(1+z);}
214 else if(l == 2) {widm = t*t*sqrt(t)*mass/m*(9+3*z0+z0*z0)/(9+3*z+z*z);}
215 return widm;
216}
217double EvtDToKSKSpi::widl1(double mass2, double mass, double sa, double sb, double sc, double r2)
218{
219 double widm = 0.;
220 double m = sqrt(sa);
221 double tmp = sb-sc;
222 double tmp1 = sa+tmp;
223 double q = 0.25*tmp1*tmp1/sa-sb;
224 if(q<0) q = 1e-16;
225 double tmp2 = mass2+tmp;
226 double q0 = 0.25*tmp2*tmp2/mass2-sb;
227 if(q0<0) q0 = 1e-16;
228 double z = q*r2;
229 double z0 = q0*r2;
230 double F = (1+z0)/(1+z);
231 double t = q/q0;
232 widm = t*sqrt(t)*mass/m*F;
233 return widm;
234}
235void EvtDToKSKSpi::propagatorRBW(double mass2, double mass, double width, double sa, double sb, double sc, double r2, int l, double prop[2])
236{
237 double a[2], b[2];
238 a[0] = 1;
239 a[1] = 0;
240 b[0] = mass2-sa;
241 b[1] = -mass*width*wid(mass2,mass,sa,sb,sc,r2,l);
242 Com_Divide(a,b,prop);
243}
244
245void EvtDToKSKSpi::propagatorGS(double mass2, double mass, double width, double sa, double sb, double sc, double r2, double prop[2])
246{
247 double a[2], b[2];
248 double tmp = sb-sc;
249 double tmp1 = sa+tmp;
250 double q2 = 0.25*tmp1*tmp1/sa-sb;
251 if(q2<0) q2 = 1e-16;
252
253 double tmp2 = mass2+tmp;
254 double q02 = 0.25*tmp2*tmp2/mass2-sb;
255 if(q02<0) q02 = 1e-16;
256
257 double q = sqrt(q2);
258 double q0 = sqrt(q02);
259 double m = sqrt(sa);
260 double q03 = q0*q02;
261 double tmp3 = log(mass+2*q0)+1.2926305904; // log(mpi0+mpip) = -1.2926305904;
262
263 double h = GS1*q/m*(log(m+2*q)+1.2926305904);
264 double h0 = GS1*q0/mass*tmp3;
265 double dh = h0*(0.125/q02-0.5/mass2)+GS3/mass2;
266 double d = GS2/q02*tmp3+GS3*mass/q0-GS4*mass/q03;
267 double f = mass2/q03*(q2*(h-h0)+(mass2-sa)*q02*dh);
268
269 a[0] = 1.0+d*width/mass;
270 a[1] = 0.0;
271 b[0] = mass2-sa+width*f;
272 b[1] = -mass*width*widl1(mass2,mass,sa,sb,sc,r2);
273 Com_Divide(a,b,prop);
274}
275
276
277void EvtDToKSKSpi::KPiSLASS(double sa, double sb, double sc, double prop[2]) {
278 const double m1430 = 1.441;
279 const double sa0 = 1.441*1.441; // m1430*m1430;
280 const double w1430 = 0.193;
281 const double Lass1 = 0.25/sa0;
282 double tmp = sb-sc;
283 double tmp1 = sa0+tmp;
284 double q0 = Lass1*tmp1*tmp1-sb;
285 if(q0<0) q0 = 1e-16;
286 double tmp2 = sa+tmp;
287 double qs = 0.25*tmp2*tmp2/sa-sb;
288 double q = sqrt(qs);
289 double width = w1430*q*m1430/sqrt(sa*q0);
290 double temp_R = atan(m1430*width/(sa0-sa));
291 if(temp_R<0) temp_R += math_pi;
292 double deltaR = -109.7 + temp_R;
293 double temp_F = atan(0.226*q/(2.0-3.819*qs)); // 2.0*0.113 = 0.226; 0.113*33.8 = 3.819
294 if(temp_F<0) temp_F += math_pi;
295 double deltaF = 0.1 + temp_F;
296 double deltaS = deltaR + 2.0*deltaF;
297 double t1 = 0.96*sin(deltaF);
298 double t2 = sin(deltaR);
299 double CF[2], CS[2];
300 CF[0] = cos(deltaF);
301 CF[1] = sin(deltaF);
302 CS[0] = cos(deltaS);
303 CS[1] = sin(deltaS);
304 prop[0] = t1*CF[0] + t2*CS[0];
305 prop[1] = t1*CF[1] + t2*CS[1];
306}
307
308double EvtDToKSKSpi::DDalitz(double P1[4], double P2[4], double P3[4], int Ang, double mass){
309 double pR[4], pD[4];
310 double temp_PDF, v_re;
311 temp_PDF = 0.0;
312 v_re = 0.0;
313 double B[2], s1, s2, s3, sR, sD;
314 for(int i=0; i<4; i++){
315 pR[i] = P1[i] + P2[i];
316 pD[i] = pR[i] + P3[i];
317 }
318 s1 = SCADot(P1,P1);
319 s2 = SCADot(P2,P2);
320 s3 = SCADot(P3,P3);
321 sR = SCADot(pR,pR);
322 sD = SCADot(pD,pD);
323
324 int G[4][4] = { {1,0,0,0}, {0,-1,0,0}, {0,0,-1,0}, {0,0,0,-1} };
325
326 if(Ang == 0){
327 B[0] = 1;
328 B[1] = 1;
329 temp_PDF = 1;
330 }
331 if(Ang == 1){
332 B[0] = barrier(1,sR,s1,s2,3.0,mass);
333 B[1] = barrier(1,sD,sR,s3,5.0,1.86966);
334 double t1[4], T1[4];
335 calt1(P1,P2,t1);
336 calt1(pR,P3,T1);
337 temp_PDF = 0;
338 for(int i=0; i<4; i++){
339 temp_PDF += t1[i]*T1[i]*G[i][i];
340 }
341 }
342 if(Ang == 2){
343 B[0] = barrier(2,sR,s1,s2,3.0,mass);
344 B[1] = barrier(2,sD,sR,s3,5.0,1.86966);
345 double t2[4][4], T2[4][4];
346 calt2(P1,P2,t2);
347 calt2(pR,P3,T2);
348 temp_PDF = 0;
349 for(int i=0; i<4; i++){
350 for(int j=0; j<4; j++){
351 temp_PDF += t2[i][j]*T2[j][i]*G[i][i]*G[j][j];
352 }
353 }
354 }
355 v_re = temp_PDF*B[0]*B[1];
356 return v_re;
357}
358
359void EvtDToKSKSpi::calEva(double* Ks01, double* Ks02, double* Pic, double *mass1, double *width1, double *amp, double *phase,int* g0,int* spin, int* modetype, int nstates, double & Result)
360{
361 //double Ks0[4], Pic[4], Pi0[4];
362 double rRes = 9.0;
363 double P12[4], P23[4], P13[4];
364 double cof[2], amp_PDF[2], PDF[2];
365 double scpi, sks02, sks01;
366 double s12, s13, s23;
367 for(int i=0; i<4; i++){
368 P12[i] = Ks01[i] + Ks02[i];
369 P13[i] = Ks01[i] + Pic[i];
370 P23[i] = Ks02[i] + Pic[i];
371 }
372 sks01 = SCADot(Ks01,Ks01);
373 sks02 = SCADot(Ks02,Ks02);
374 scpi = SCADot(Pic,Pic);
375 s12 = SCADot(P12,P12);
376 s13 = SCADot(P13,P13);
377 s23 = SCADot(P23,P23);
378 double pro[2], temp_PDF, amp_tmp[2],temp_PDF1 ,temp_PDF2,pro1[2],pro2[2];
379 double mass1sq;
380 amp_PDF[0] = 0;
381 amp_PDF[1] = 0;
382 PDF[0] = 0;
383 PDF[1] = 0;
384 amp_tmp[0] = 0;
385 amp_tmp[1] = 0;
386 for(int i=0; i<nstates; i++) {
387 amp_tmp[0] = 0;
388 amp_tmp[1] = 0;
389 mass1sq = mass1[i]*mass1[i];
390 cof[0] = amp[i]*cos(phase[i]);
391 cof[1] = amp[i]*sin(phase[i]);
392 temp_PDF = 0;
393 if(modetype[i] == 12){
394 temp_PDF = DDalitz(Ks01, Ks02, Pic, spin[i], mass1[i]);
395 if(g0[i]==1) propagatorRBW(mass1sq, mass1[i],width1[i],s12,sks01,sks02,rRes,spin[i],pro);
396 if(g0[i]==12) KPiSLASS(s12,sks01,sks02,pro);
397 if(g0[i]==0){
398 pro[0] = 1;
399 pro[1] = 0;
400 }
401 amp_tmp[0] = temp_PDF*pro[0];
402 amp_tmp[1] = temp_PDF*pro[1];
403 }
404 if(modetype[i] == 13){
405 temp_PDF1 = DDalitz(Ks01, Pic, Ks02, spin[i], mass1[i]);
406 if(g0[i]==1) propagatorRBW(mass1sq, mass1[i],width1[i],s13,sks01,scpi,rRes,spin[i],pro1);
407 if(g0[i]==12) KPiSLASS(s13,sks01,scpi,pro1);
408 if(g0[i]==0){
409 pro1[0] = 1;
410 pro1[1] = 0;
411 }
412 temp_PDF2 = DDalitz(Ks02, Pic, Ks01, spin[i], mass1[i]);
413 if(g0[i]==1) propagatorRBW(mass1sq, mass1[i],width1[i],s23,sks02,scpi,rRes,spin[i],pro2);
414 if(g0[i]==12) KPiSLASS(s23,sks02,scpi,pro2);
415 if(g0[i]==0){
416 pro2[0] = 1;
417 pro2[1] = 0;
418 }
419 amp_tmp[0] = ( temp_PDF1*pro1[0]+temp_PDF2*pro2[0]);
420 amp_tmp[1] = ( temp_PDF1*pro1[1]+temp_PDF2*pro2[1]);
421 }
422 Com_Multi(amp_tmp,cof,amp_PDF);
423 PDF[0] += amp_PDF[0];
424 PDF[1] += amp_PDF[1];
425
426 }
427 double value = PDF[0]*PDF[0] + PDF[1]*PDF[1];
428 if(value <=0) value = 1e-20;
429 Result = value;
430
431}
sin
double sin(const BesAngle a)
Definition: BesAngle.h:210
cos
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Definition: BesAngle.h:213
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Definition: CosmicGenerator.cxx:138
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TFile f("ana_bhabha660a_dqa_mcPat_zy_old.root")
q
****INTEGER imax DOUBLE PRECISION m_pi *DOUBLE PRECISION m_amfin DOUBLE PRECISION m_Chfin DOUBLE PRECISION m_Xenph DOUBLE PRECISION m_sinw2 DOUBLE PRECISION m_GFermi DOUBLE PRECISION m_MfinMin DOUBLE PRECISION m_ta2 INTEGER m_out INTEGER m_KeyFSR INTEGER m_KeyQCD *COMMON c_Semalib $ !copy of input $ !CMS energy $ !beam mass $ !final mass $ !beam charge $ !final charge $ !smallest final mass $ !Z mass $ !Z width $ !EW mixing angle $ !Gmu Fermi $ alphaQED at q
Definition: KKsem.h:33
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Definition: Mcgpj.cxx:51
t
TTree * t
Definition: binning.cxx:23
EvtDToKSKSpi::getName
void getName(std::string &name)
Definition: EvtDToKSKSpi.cc:33
EvtDToKSKSpi::decay
void decay(EvtParticle *p)
Definition: EvtDToKSKSpi.cc:78
EvtDToKSKSpi::~EvtDToKSKSpi
virtual ~EvtDToKSKSpi()
Definition: EvtDToKSKSpi.cc:31
EvtDToKSKSpi::clone
EvtDecayBase * clone()
Definition: EvtDToKSKSpi.cc:37
EvtDToKSKSpi::initProbMax
void initProbMax()
Definition: EvtDToKSKSpi.cc:74
EvtDecayBase::checkSpinParent
void checkSpinParent(EvtSpinType::spintype sp)
Definition: EvtDecayBase.cc:520
EvtDecayBase::setProbMax
void setProbMax(double prbmx)
Definition: EvtDecayBase.cc:297
EvtDecayBase::checkNDaug
void checkNDaug(int d1, int d2=-1)
Definition: EvtDecayBase.cc:504
EvtDecayBase::getDaugs
EvtId * getDaugs()
Definition: EvtDecayBase.hh:65
EvtDecayBase::checkNArg
void checkNArg(int a1, int a2=-1, int a3=-1, int a4=-1)
Definition: EvtDecayBase.cc:482
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void setProb(double prob)
Definition: EvtDecayProb.hh:34
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const EvtVector4R & getP4() const
Definition: EvtParticle.cc:120
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EvtParticle * getDaug(int i)
Definition: EvtParticle.cc:84
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double initializePhaseSpace(int numdaughter, EvtId *daughters, double poleSize=-1., int whichTwo1=0, int whichTwo2=1)
Definition: EvtParticle.cc:1070
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double get(int i) const
Definition: EvtVector4R.hh:179
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double double double double * s12
Definition: qcdloop1.h:77
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Definition: qcdloop1.h:77
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