1 //----------------------------------------------------------------------------------
3 // Module: EvtLb2Lll.cpp
5 // Desription: Routine to implement Lambda_b0 -> Lambda_0 l+ l- decays accroding to
6 // several models: Chen. Geng.
7 // Aliev. Ozpineci. Savci.
9 // Modification history:
11 // 10/07/2012 MK Fix calculation of N1, N2; based on hep-ph/021144
12 // 09/02/2009 PR Commented check for (anti-)Lambda0 names
13 // 15/09/2004 PR Module created according to PHSP model
14 // 20/02/2005 PR Added parameters, created matrix element (without polarization)
15 // 04/03/2005 PR LD contrib., corrected WC eff. according to Chen. Geng.
19 // - Properly handle antiparticles, needs change of u, ubar to v, vbar in
20 // hadronic current, or other way of putting that in
21 //----------------------------------------------------------------------------------
24 #pragma warning( disable : 4786 )
25 // Disable anoying warning about symbol size
28 #include "EvtGenModels/EvtLb2Lll.hh"
29 #include "EvtGenBase/EvtParticle.hh"
30 #include "EvtGenBase/EvtDiracParticle.hh"
31 #include "EvtGenBase/EvtPDL.hh"
32 #include "EvtGenBase/EvtDiracSpinor.hh"
33 #include "EvtGenBase/EvtTensor4C.hh"
34 #include "EvtGenBase/EvtVector4C.hh"
35 #include "EvtGenBase/EvtVector4R.hh"
36 #include "EvtGenBase/EvtComplex.hh"
37 #include "EvtGenBase/EvtGammaMatrix.hh"
41 EvtLb2Lll::~EvtLb2Lll() {}
43 EvtDecayBase* EvtLb2Lll::clone(){
47 std::string EvtLb2Lll::getName(){
51 void EvtLb2Lll::init(){
53 if(getNArg()>8){ // Decay parameters
54 report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll generator expected max. 8 arguments but found: " << getNArg() << std::endl;
55 report(INFO ,"EvtGen") << " 1. Lambda_b0 polarization - zero is default" << std::endl;
56 report(INFO ,"EvtGen") << " 2. Model type - \"SM\" for Standard Model is default" << std::endl;
57 report(INFO ,"EvtGen") << " 3. Form-Factors - \"HQET\" is used by default" << std::endl;
58 report(INFO ,"EvtGen") << " 4. How to set polarization - \"ModifiedSpinors\" is default" << std::endl;
59 report(INFO ,"EvtGen") << " 5. Include long distance (LD) effects - \"SD\" (no) is default" << std::endl;
60 report(INFO ,"EvtGen") << " 6. NonFactorizable contribution (omega) to b->sg decay at q2=0 " << std::endl;
61 report(INFO ,"EvtGen") << " 7. Note on every x-th decay" << std::endl;
62 report(INFO ,"EvtGen") << " 8. Maximum probability - automatic by default" << std::endl;
66 if(getNDaug()!=3){ // Check that there are 3 daughters only
67 report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll generator expected 3 daughters but found: " << getNDaug() << std::endl;
71 // TODO: better check based on spin and falvour is needed to allow usage of aliases !
72 if(EvtPDL::name(getParentId())=="Lambda_b0"){ // Check daughters of Lambda_b0
73 report(INFO,"EvtGen") << " EvtLb2Lll generator found Lambda_b0" << std::endl;
74 //if(EvtPDL::name(getDaug(0))!="Lambda0"){
75 // report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll generator expected Lambda0 daughter but found: " << EvtPDL::name(getDaug(0)) << std::endl;
78 if(EvtPDL::name(getDaug(1))=="e-" && EvtPDL::name(getDaug(2))=="e+"){
79 m_decayName="Lambda_b0 -> Lambda0 e- e+";
80 report(INFO,"EvtGen") << " EvtLb2Lll generator found decay: Lambda_b0 -> Lambda0 e- e+" << std::endl;
81 }else if(EvtPDL::name(getDaug(1))=="mu-" && EvtPDL::name(getDaug(2))=="mu+"){
82 m_decayName="Lambda_b0 -> Lambda0 mu- mu+";
83 report(INFO,"EvtGen") << " EvtLb2Lll generator found decay: Lambda_b0 -> Lambda0 mu- mu+" << std::endl;
84 }else if(EvtPDL::name(getDaug(1))=="tau-" && EvtPDL::name(getDaug(2))=="tau+"){
85 m_decayName="Lambda_b0 -> Lambda0 tau- tau+";
86 report(INFO,"EvtGen") << " EvtLb2Lll generator found decay: Lambda_b0 -> Lambda0 tau- tau+" << std::endl;
88 report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll generator expected lepton pair daughters but found: " << EvtPDL::name(getDaug(1)) << " " << EvtPDL::name(getDaug(2)) << std::endl;
91 //TODO: The model is known not to work correctly for anti-Lambda_b0 (A_FB does not change its sign)
92 }else if(EvtPDL::name(getParentId())=="anti-Lambda_b0"){ // Check daughters of anti-Lambda_b0
93 report(INFO,"EvtGen") << " EvtLb2Lll generator found anti-Lambda_b0" << std::endl;
94 //if(EvtPDL::name(getDaug(0))!="anti-Lambda0"){
95 // report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll generator expected anti-Lambda0 daughter but found: " << EvtPDL::name(getDaug(0)) << std::endl;
98 if(EvtPDL::name(getDaug(1))=="e+" && EvtPDL::name(getDaug(2))=="e-"){
99 m_decayName="anti-Lambda_b0 -> anti-Lambda0 e+ e-";
100 report(INFO,"EvtGen") << " EvtLb2Lll generator found decay: anti-Lambda_b0 -> anti-Lambda0 e+ e-" << std::endl;
101 }else if(EvtPDL::name(getDaug(1))=="mu+" && EvtPDL::name(getDaug(2))=="mu-"){
102 m_decayName="anti-Lambda_b0 -> anti-Lambda0 mu+ mu-";
103 report(INFO,"EvtGen") << " EvtLb2Lll generator found decay: anti-Lambda_b0 -> anti-Lambda0 mu+ mu-" << std::endl;
104 }else if(EvtPDL::name(getDaug(1))=="tau-" && EvtPDL::name(getDaug(2))=="tau+"){
105 m_decayName="anti-Lambda_b0 -> anti-Lambda0 tau+ tau-";
106 report(INFO,"EvtGen") << " EvtLb2Lll generator found decay: anti-Lambda_b0 -> anti-Lambda0 tau+ tau-" << std::endl;
108 report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll generator expected lepton pair daughters but found: " << EvtPDL::name(getDaug(1)) << " " << EvtPDL::name(getDaug(2)) << std::endl;
111 }else{ // This model is not intended for decay of anything else than (anti-)Lambda_b0
112 report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll generator expected (anti-)Lambda_b0 parent but found: " << EvtPDL::name(getParentId()) << std::endl;
116 // Read and check all parameters
118 if(getArg(0)>1. || getArg(0)<-1.){
119 report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll expects polarization to be in interval <-1,1>, not " << getArg(0) << std::endl;
122 m_polarizationLambdab0 = getArg(0);
124 m_polarizationLambdab0 = 0;
126 report(INFO,"EvtGen") << " EvtLb2Lll set Lambda_b0 polarization to " << m_polarizationLambdab0 << std::endl;
129 if(getArgStr(1).substr(1,getArgStr(1).size()-2)!="SM" &&
130 getArgStr(1).substr(1,getArgStr(1).size()-2)!="-C7_SM" &&
131 getArgStr(1).substr(1,getArgStr(1).size()-2)!="SUSY-ChenGeng"){
132 report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll doesn't know this physics model: " << getArgStr(1) << std::endl;
135 m_HEPmodel = getArgStr(1).substr(1,getArgStr(1).size()-2);
139 report(INFO,"EvtGen") << " EvtLb2Lll will use this physics model: " << m_HEPmodel << std::endl;
142 if(getArgStr(2).substr(1,getArgStr(2).size()-2)!="HQET" &&
143 getArgStr(2).substr(1,getArgStr(2).size()-2)!="HQET-noF2" &&
144 getArgStr(2).substr(1,11) !="HQET-delta="){
145 report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll doesn't know this Form-Factors model: " << getArgStr(2) << std::endl;
148 m_FFtype = getArgStr(2).substr(1,getArgStr(2).size()-2);
152 report(INFO,"EvtGen") << " EvtLb2Lll will use this Form-Factors model: " << m_FFtype << std::endl;
155 if(getArgStr(3).substr(1,getArgStr(3).size()-2)!="Unpolarized"){
156 report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll doesn't know kind of introducing polarization: " << getArgStr(3) << std::endl;
159 m_polarizationIntroduction = getArgStr(3).substr(1,getArgStr(3).size()-2);
161 m_polarizationIntroduction = "Unpolarized";
163 report(INFO,"EvtGen") << " EvtLb2Lll will use this kind of introducing polarization: " << m_polarizationIntroduction << std::endl;
166 if(getArgStr(4).substr(1,getArgStr(4).size()-2)!="SD" && getArgStr(4).substr(1,getArgStr(4).size()-2)!="LD"){
167 report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll didn't find SD or LD parameter: " << getArgStr(4) << std::endl;
170 m_effectContribution = getArgStr(5).substr(1,getArgStr(4).size()-2);
172 m_effectContribution = "SD";
174 report(INFO,"EvtGen") << " EvtLb2Lll will include contribution from these effects: " << m_effectContribution << std::endl;
177 if(fabs(getArg(5))>0.15){
178 report(WARNING,"EvtGen") << " WARNING: EvtLb2Lll found very high contribution to b->sg decay at q2=0: " << getArg(5) << std::endl;
184 report(INFO,"EvtGen") << " EvtLb2Lll will use this contribution to b->sg decay at q2=0: " << m_omega << std::endl;
186 if(getNArg()>6) m_noTries = (long)(getArg(6));
191 report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll expects positive maximum probability not : " << getArg(7) << std::endl;
194 m_maxProbability = getArg(7);
196 m_maxProbability = 0.;
198 report(INFO,"EvtGen") << " EvtLb2Lll maximum probability was set to " << m_maxProbability << std::endl;
201 // Initialize Wilson coefficients by Buras and Munz
202 // TODO: should have common W.C. source for all decays in EvtGen
203 m_WC.CalculateAllCoefficients();
207 void EvtLb2Lll::initProbMax(){
209 report(INFO,"EvtGen") << " EvtLb2Lll is finding maximum probability ... " << std::endl;
211 if(m_maxProbability==0){
213 EvtDiracParticle *parent = new EvtDiracParticle;
214 parent->noLifeTime();
215 parent->init(getParentId(),EvtVector4R(EvtPDL::getMass(getParentId()),0,0,0));
216 parent->setDiagonalSpinDensity();
219 EvtId daughters[3] = {getDaug(0),getDaug(1),getDaug(2)};
220 amp.init(getParentId(),3,daughters);
221 parent->makeDaughters(3,daughters);
222 EvtParticle *lambda = parent->getDaug(0);
223 EvtParticle *lep1 = parent->getDaug(1);
224 EvtParticle *lep2 = parent->getDaug(2);
225 lambda -> noLifeTime();
226 lep1 -> noLifeTime();
227 lep2 -> noLifeTime();
230 rho.setDiag(parent->getSpinStates());
232 double M0 = EvtPDL::getMass(getParentId());
233 double mL = EvtPDL::getMass(getDaug(0));
234 double m1 = EvtPDL::getMass(getDaug(1));
235 double m2 = EvtPDL::getMass(getDaug(2));
237 double q2,pstar,elambda,theta;
238 double q2min = (m1+m2)*(m1+m2);
239 double q2max = (M0-mL)*(M0-mL);
241 EvtVector4R p4lambda,p4lep1,p4lep2,boost;
243 report(INFO,"EvtGen") << " EvtLb2Lll is probing whole phase space ..." << std::endl;
248 q2 = q2min+i*(q2max-q2min)/100.;
249 elambda = (M0*M0+mL*mL-q2)/2/M0;
251 else pstar = sqrt(q2-(m1+m2)*(m1+m2))*sqrt(q2-(m1-m2)*(m1-m2))/2/sqrt(q2);
252 boost.set(M0-elambda,0,0,+sqrt(elambda*elambda-mL*mL));
253 p4lambda.set(elambda,0,0,-sqrt(elambda*elambda-mL*mL));
255 theta = j*EvtConst::pi/45;
256 p4lep1.set(sqrt(pstar*pstar+m1*m1),0,+pstar*sin(theta),+pstar*cos(theta));
257 p4lep2.set(sqrt(pstar*pstar+m2*m2),0,-pstar*sin(theta),-pstar*cos(theta));
258 //std::cout << "p1: " << p4lep1 << " p2: " << p4lep2 << " pstar: " << pstar << std::endl;
259 p4lep1 = boostTo(p4lep1,boost);
260 p4lep2 = boostTo(p4lep1,boost);
261 lambda -> init(getDaug(0),p4lambda);
262 lep1 -> init(getDaug(1),p4lep1 );
263 lep2 -> init(getDaug(2),p4lep2 );
264 calcAmp(&,parent);
265 prob = rho.normalizedProb(amp.getSpinDensity());
266 //std::cout << "q2: " << q2 << " \t theta: " << theta << " \t prob: " << prob << std::endl;
267 //std::cout << "p1: " << p4lep1 << " p2: " << p4lep2 << " q2-q2min: " << q2-(m1+m2)*(m1+m2) << std::endl;
268 if(prob>m_maxProbability){
269 report(INFO,"EvtGen") << " - probability " << prob << " found at q2 = " << q2 << " (" << 100*(q2-q2min)/(q2max-q2min) << " %) and theta = " << theta*180/EvtConst::pi << std::endl;
270 m_maxProbability=prob;
276 //m_poleSize = 0.04*q2min;
277 m_maxProbability *= 1.2;
281 setProbMax(m_maxProbability);
282 report(INFO,"EvtGen") << " EvtLb2Lll set up maximum probability to " << m_maxProbability << std::endl;
286 void EvtLb2Lll::decay(EvtParticle* parent){
288 //setWeight(parent->initializePhaseSpace(getNDaug(),getDaugs(),m_poleSize,1,2));
289 parent->initializePhaseSpace(getNDaug(),getDaugs());
290 calcAmp(&_amp2,parent);
294 void EvtLb2Lll::calcAmp(EvtAmp *amp,EvtParticle *parent){
296 static long noTries=0;
297 static double delta=0;
299 EvtComplex Matrix[2][2][2][2];
306 double r,M_L,M_Lb,M_s,M_c,M_b,q2,alpha,M_W,M_t;
307 double M_psi[2]={0,0},Gamma_psi[2]={0,0},k_psi[2]={0,0};
308 double F0_1,F0_2,a_F1,a_F2,b_F1,b_F2,F1,F2;
309 double f_1,f_2,f_3,g_1,g_2,g_3,f_1T,f_2T,f_3T,g_1T,g_2T,g_3T,f_TV,f_TS,g_TV(0.0),g_TS,f_T,g_T;
310 EvtComplex A1,A2,A3,B1,B2,B3,D1,D2,D3,E1,E2,E3,N1,N2,H1,H2;
311 EvtComplex C_SL,C_BR,C_LLtot,C_LRtot,C_LL,C_LR,C_RL,C_RR,C_LRLR,C_RLLR,C_LRRL,C_RLRL,C_T,C_TE;
312 EvtComplex Yld,C_7eff,C_9eff;
313 EvtComplex V_ts,V_tb;
315 EvtVector4C lbar_Gmu_l[2][2],lbar_GmuG5_l[2][2],hbar_GmuPlusG5_h[2][2],hbar_GmuMinusG5_h[2][2],hbar_Gmu_h[2][2];
316 EvtComplex lbar_l[2][2],lbar_G5_l[2][2],hbar_1PlusG5_h[2][2],hbar_1MinusG5_h[2][2],hbar_G5_h[2][2],hbar_h[2][2];
317 EvtTensor4C lbar_Smunu_l[2][2],lbar_ESmunu_l[2][2],hbar_SmunuPlusG5_h[2][2],hbar_SmunuMinusG5_h[2][2],hbar_Smunu_h[2][2];
318 EvtVector4R q_mu,P_mu;
320 EvtDiracSpinor parent__spParent[2];
322 M_Lb = parent->mass();
323 M_L = parent->getDaug(0)->mass();
332 if(m_decayName=="Lambda_b0 -> Lambda0 e- e+" || m_decayName=="anti-Lambda_b0 -> anti-Lambda0 e+ e-"){
336 if(m_decayName=="Lambda_b0 -> Lambda0 mu- mu+" || m_decayName=="anti-Lambda_b0 -> anti-Lambda0 mu+ mu-"){
340 if(m_decayName=="Lambda_b0 -> Lambda0 tau- tau+" || m_decayName=="anti-Lambda_b0 -> anti-Lambda0 tau+ tau-"){
344 if(m_effectContribution=="LD"){
349 //V_tb = sqrt(1-pow(0.0413,2))*sqrt(1-pow(0.0037,2));
350 //V_ts = -sqrt(1-pow(0.2243,2))*0.0413-0.2243*sqrt(1-pow(0.0413,2))*0.0037*(cos(60*EvtConst::pi/180)+i1*sin(60*EvtConst::pi/180));
352 P_mu = parent->getP4Restframe()+parent->getDaug(0)->getP4();
353 q_mu = parent->getP4Restframe()-parent->getDaug(0)->getP4();
356 if(m_noTries>0) if(!((++noTries)%m_noTries)) report(DEBUG,"EvtGen") << " EvtLb2Lll already finished " << noTries << " matrix element calculations" << std::endl;
358 if(m_FFtype=="HQET"){
359 r = M_L*M_L/M_Lb/M_Lb;
366 F1 = F0_1/(1.0-(q2/M_Lb/M_Lb)*(a_F1-b_F1*(q2/M_Lb/M_Lb)));
367 F2 = F0_2/(1.0-(q2/M_Lb/M_Lb)*(a_F2-b_F2*(q2/M_Lb/M_Lb)));
368 g_1 = f_1 = f_2T = g_2T = F1+sqrt(r)*F2;
369 //std::cout << " F1: " << F1 << " F2: " << F2 << " r: " << r << " M_L: " << M_L << " M_Lb: " << M_Lb << std::endl;
370 //std::cout << " sqrt(q2): " << sqrt(q2) << " q2: " << q2 << " M_Lb^2" << M_Lb*M_Lb << std::endl;
371 g_2 = f_2 = g_3 = f_3 = g_TV = f_TV = F2/M_Lb;
373 g_1T = f_1T = F2/M_Lb*q2;
374 g_3T = +F2/M_Lb*(M_Lb+M_L);
375 f_3T = -F2/M_Lb*(M_Lb-M_L);
378 }else if(strstr(m_FFtype.c_str(),"HQET-delta=")==m_FFtype.c_str()){
379 //report(WARNING,"EvtGen") << " WARNING: HQET-delta FF model should be checked for correctness" << std::endl;
380 if(delta==0) sscanf(m_FFtype.c_str(),"%c%c%c%c%c%c%c%c%c%c%c%lf",&ch,&ch,&ch,&ch,&ch,&ch,&ch,&ch,&ch,&ch,&ch,&delta);
381 r = M_L*M_L/M_Lb/M_Lb;
388 F1 = F0_1/(1.0-(q2/M_Lb/M_Lb)*(a_F1-b_F1*(q2/M_Lb/M_Lb)));
389 F2 = F0_2/(1.0-(q2/M_Lb/M_Lb)*(a_F2-b_F2*(q2/M_Lb/M_Lb)));
390 g_1 = f_1 = f_2T = g_2T = F1+sqrt(r)*F2;
393 g_2 = f_2 = g_3 = f_3 = g_TV = f_TV = F2/M_Lb;
395 g_1T = f_1T = F2/M_Lb*q2;
396 g_3T = +F2/M_Lb*(M_Lb+M_L);
397 f_3T = -F2/M_Lb*(M_Lb-M_L);
400 }else if(m_FFtype=="HQET-noF2"){
401 //report(WARNING,"EvtGen") << " WARNING: HQET-noF2 FF model should be checked for correctness" << std::endl;
402 r = M_L*M_L/M_Lb/M_Lb;
406 F1 = F0_1/(1.0-(q2/M_Lb/M_Lb)*(a_F1-b_F1*(q2/M_Lb/M_Lb)));
407 g_1 = f_1 = f_2T = g_2T = F1;
408 g_2 = f_2 = g_3 = f_3 = g_TV = f_TV = 0;
415 }else{ // general relations for Form-Factors
416 f_1 = f_2 = f_3 = g_1 = g_2 = g_3 = f_3T = g_3T = f_TS = g_TS = f_T = g_T = f_TV = 0;
418 f_1T = (f_TV+f_TS*(M_L+M_Lb))*q2;
419 f_1T = -q2/(M_Lb-M_L)*f_3T;
421 g_1T = (g_TV-g_TS*(M_L-M_Lb))*q2;
422 g_1T = +q2/(M_Lb+M_L)*g_3T;
423 report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll - unknown Form-Factors model: " << m_FFtype << " - this should never happen !" << std::endl;
427 if(m_HEPmodel=="SM"){
428 C_LL=C_LR=C_RL=C_RR=C_LRLR=C_RLLR=C_LRRL=C_RLRL=C_T=C_TE=EvtComplex(0,0);
429 Yld = m_WC.Yld(q2,k_psi,Gamma_psi,M_psi,2,m_WC.GetC1(),m_WC.GetC2(),m_WC.GetC3(),m_WC.GetC4(),m_WC.GetC5(),m_WC.GetC6(),1./alpha);
430 C_7eff = m_WC.GetC7eff0() + m_WC.C7b2sg(m_WC.GetStrongCouplingConst(),m_WC.GetEta(),m_WC.GetC2(),M_t,M_W) + m_omega*(m_WC.hzs(M_c/M_b,q2/M_b/M_b,M_b,M_b) + Yld);
431 C_9eff = Yld + m_WC.C9efftilda(M_c/M_b,q2/M_b/M_b,m_WC.GetStrongCouplingConst(),m_WC.GetC1(),m_WC.GetC2(),m_WC.GetC3(),m_WC.GetC4(),m_WC.GetC5(),m_WC.GetC6(),m_WC.GetC9tilda(),m_WC.GetRenormSchemePar());
432 C_SL = -2*M_s*C_7eff;
433 C_BR = -2*M_b*C_7eff;
434 C_LLtot = C_9eff-m_WC.GetC10tilda()+C_LL;
435 C_LRtot = C_9eff+m_WC.GetC10tilda()+C_LR;
436 //std::cout << "Yld: " << Yld << " C7eff: " << C_7eff << " C_9eff: " << C_9eff << " Diff7: " << C_7eff-m_WC.GetC7eff0() << " Diff9: " << C_9eff-m_WC.GetC9tilda() << std::endl;
437 }else if(m_HEPmodel=="-C7_SM"){
438 C_LL=C_LR=C_RL=C_RR=C_LRLR=C_RLLR=C_LRRL=C_RLRL=C_T=C_TE=EvtComplex(0,0);
439 Yld = m_WC.Yld(q2,k_psi,Gamma_psi,M_psi,2,m_WC.GetC1(),m_WC.GetC2(),m_WC.GetC3(),m_WC.GetC4(),m_WC.GetC5(),m_WC.GetC6(),1./alpha);
440 C_7eff = m_WC.GetC7eff0() + m_WC.C7b2sg(m_WC.GetStrongCouplingConst(),m_WC.GetEta(),m_WC.GetC2(),M_t,M_W) + m_omega*(m_WC.hzs(M_c/M_b,q2/M_b/M_b,M_b,M_b) + Yld);
441 C_9eff = Yld + m_WC.C9efftilda(M_c/M_b,q2/M_b/M_b,m_WC.GetStrongCouplingConst(),m_WC.GetC1(),m_WC.GetC2(),m_WC.GetC3(),m_WC.GetC4(),m_WC.GetC5(),m_WC.GetC6(),m_WC.GetC9tilda(),m_WC.GetRenormSchemePar());
442 C_SL = +2*M_s*C_7eff;
443 C_BR = +2*M_b*C_7eff;
444 C_LLtot = C_9eff-m_WC.GetC10tilda()+C_LL;
445 C_LRtot = C_9eff+m_WC.GetC10tilda()+C_LR;
446 //std::cout << "Yld: " << Yld << " C7eff: " << C_7eff << " C_9eff: " << C_9eff << " Diff7: " << C_7eff-m_WC.GetC7eff0() << " Diff9: " << C_9eff-m_WC.GetC9tilda() << std::endl;
447 }else if(m_HEPmodel=="SUSY-ChenGeng"){
448 //report(WARNING,"EvtGen") << " WARNING: SUSY-ChenGeng model should be checked for correctness" << std::endl;
449 C_LL=C_LR=C_RL=C_RR=C_LRLR=C_RLLR=C_LRRL=C_RLRL=C_T=C_TE=EvtComplex(0,0);
450 EvtComplex d_u23LL = 0.1;
451 EvtComplex d_u33RL = 0.65;
452 EvtComplex d_d23LR = 0.03*exp(i1*EvtConst::pi*2/5);
453 EvtComplex d_u23LR = -0.8*exp(i1*EvtConst::pi/4);
454 EvtComplex C_7susy = -1.75*d_u23LL - 0.25*d_u23LR - 10.3*d_d23LR;
455 EvtComplex C_9susy = 0.82*d_u23LR;
456 EvtComplex C_10susy = -9.37*d_u23LR + 1.4*d_u23LR*d_u33RL + 2.7*d_u23LL;
457 Yld = m_WC.Yld(q2,k_psi,Gamma_psi,M_psi,2,m_WC.GetC1(),m_WC.GetC2(),m_WC.GetC3(),m_WC.GetC4(),m_WC.GetC5(),m_WC.GetC6(),1./alpha);
458 C_7eff = m_WC.GetC7eff0() + C_7susy*pow(m_WC.GetEta(),16./23.) + m_WC.C7b2sg(m_WC.GetStrongCouplingConst(),m_WC.GetEta(),m_WC.GetC2(),M_t,M_W) + m_omega*(m_WC.hzs(M_c/M_b,q2/M_b/M_b,M_b,M_b) + Yld);
459 C_9eff = Yld + m_WC.C9efftilda(M_c/M_b,q2/M_b/M_b,m_WC.GetStrongCouplingConst(),m_WC.GetC1(),m_WC.GetC2(),m_WC.GetC3(),m_WC.GetC4(),m_WC.GetC5(),m_WC.GetC6(),m_WC.GetC9tilda()+C_9susy,m_WC.GetRenormSchemePar());
460 C_SL = -2*M_s*C_7eff;
461 C_BR = -2*M_b*C_7eff;
462 C_LLtot = C_9eff-m_WC.GetC10tilda()-C_10susy+C_LL;
463 C_LRtot = C_9eff+m_WC.GetC10tilda()+C_10susy+C_LR;
464 //std::cout << "Yld: " << Yld << " C7eff: " << C_7eff << " C_9eff: " << C_9eff << " Diff7: " << C_7eff-m_WC.GetC7eff0() << " Diff9: " << C_9eff-m_WC.GetC9tilda() << std::endl;
466 report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll - unknown physics model: " << m_HEPmodel << " - this should never happen !" << std::endl;
470 A1 = (f_1T-g_1T)*C_SL/q2 + (f_1T+g_1T)*C_BR/q2 + 0.5*(f_1-g_1)*(C_LLtot+C_LRtot) + 0.5*(f_1+g_1)*(C_RL+C_RR);
471 //std::cout << "f_1T: " << f_1T << " g_1T: " << g_1T << " C_SL: " << C_SL << " C_BR: " << C_BR << " f_1: " << f_1 << " g_1: " << g_1 << " C_LLtot: " << C_LLtot << " C_LRtot: " << C_LRtot << " C_RL: " << C_RL << " C_RR: " << C_RR << std::endl;
472 A2 = (f_2T-g_2T)*C_SL/q2 + (f_2T+g_2T)*C_BR/q2 + 0.5*(f_2-g_2)*(C_LLtot+C_LRtot) + 0.5*(f_2+g_2)*(C_RL+C_RR);
473 A3 = (f_3T-g_3T)*C_SL/q2 + (f_3T+g_3T)*C_BR/q2 + 0.5*(f_3-g_3)*(C_LLtot+C_LRtot) + 0.5*(f_3+g_3)*(C_RL+C_RR);
475 B1 = (f_1T+g_1T)*C_SL/q2 + (f_1T-g_1T)*C_BR/q2 + 0.5*(f_1+g_1)*(C_LLtot+C_LRtot) + 0.5*(f_1-g_1)*(C_RL+C_RR);
476 B2 = (f_2T+g_2T)*C_SL/q2 + (f_2T-g_2T)*C_BR/q2 + 0.5*(f_2+g_2)*(C_LLtot+C_LRtot) + 0.5*(f_2-g_2)*(C_RL+C_RR);
477 B3 = (f_3T+g_3T)*C_SL/q2 + (f_3T-g_3T)*C_BR/q2 + 0.5*(f_3+g_3)*(C_LLtot+C_LRtot) + 0.5*(f_3-g_3)*(C_RL+C_RR);
479 D1 = 0.5*(C_RR-C_RL)*(f_1+g_1) + 0.5*(C_LRtot-C_LLtot)*(f_1-g_1);
480 D2 = 0.5*(C_RR-C_RL)*(f_2+g_2) + 0.5*(C_LRtot-C_LLtot)*(f_2-g_2);
481 D3 = 0.5*(C_RR-C_RL)*(f_3+g_3) + 0.5*(C_LRtot-C_LLtot)*(f_3-g_3);
483 E1 = 0.5*(C_RR-C_RL)*(f_1-g_1) + 0.5*(C_LRtot-C_LLtot)*(f_1+g_1);
484 E2 = 0.5*(C_RR-C_RL)*(f_2-g_2) + 0.5*(C_LRtot-C_LLtot)*(f_2+g_2);
485 E3 = 0.5*(C_RR-C_RL)*(f_3-g_3) + 0.5*(C_LRtot-C_LLtot)*(f_3+g_3);
487 N1 = (f_1*(M_Lb-M_L)+f_3*q2)/M_b*(C_LRLR+C_RLLR+C_LRRL+C_RLRL); // Should be mLb - mL
488 N2 = (f_1*(M_Lb-M_L)+f_3*q2)/M_b*(C_LRLR+C_RLLR-C_LRRL-C_RLRL);
490 H1 = (g_1*(M_Lb+M_L)-g_3*q2)/M_b*(C_LRLR-C_RLLR+C_LRRL-C_RLRL);
491 H2 = (g_1*(M_Lb+M_L)-g_3*q2)/M_b*(C_LRLR-C_RLLR-C_LRRL+C_RLRL);
495 lbar_Gmu_l [i/2][i%2] = EvtLeptonVCurrent(parent->getDaug(1)->spParent(i/2),parent->getDaug(2)->spParent(i%2));
496 lbar_GmuG5_l [i/2][i%2] = EvtLeptonACurrent(parent->getDaug(1)->spParent(i/2),parent->getDaug(2)->spParent(i%2));
497 lbar_l [i/2][i%2] = EvtLeptonSCurrent(parent->getDaug(1)->spParent(i/2),parent->getDaug(2)->spParent(i%2));
498 lbar_G5_l [i/2][i%2] = EvtLeptonPCurrent(parent->getDaug(1)->spParent(i/2),parent->getDaug(2)->spParent(i%2));
499 lbar_Smunu_l [i/2][i%2] = EvtLeptonTCurrent(parent->getDaug(1)->spParent(i/2),parent->getDaug(2)->spParent(i%2));
500 lbar_ESmunu_l[i/2][i%2] = dual(EvtLeptonTCurrent(parent->getDaug(1)->spParent(i/2),parent->getDaug(2)->spParent(i%2)));
503 // TODO: polarization not yet introduced
504 if(m_polarizationIntroduction=="SpinDensityMatrix"){
505 //parent->setSpinDensityForward();
506 parent__spParent[0]=parent->sp(0);
507 parent__spParent[1]=parent->sp(1);
508 }else if(m_polarizationIntroduction=="ModifiedSpinors"){
509 parent__spParent[0]=parent->sp(0);
510 parent__spParent[1]=parent->sp(1);
511 }else if(m_polarizationIntroduction=="Unpolarized"){
512 parent__spParent[0]=parent->sp(0);
513 parent__spParent[1]=parent->sp(1);
515 report(ERROR,"EvtGen") << " ERROR: EvtLb2Lll - unknown polarization: " << m_polarizationIntroduction << " - this should never happen !" << std::endl;
520 hbar_GmuPlusG5_h [i/2][i%2] = EvtLeptonVCurrent(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]) + EvtLeptonACurrent(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]);
521 hbar_GmuMinusG5_h [i/2][i%2] = EvtLeptonVACurrent(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]);
522 hbar_SmunuPlusG5_h [i/2][i%2] = EvtLeptonTCurrent(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]) + EvtLeptonTG5Current(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]);
523 hbar_SmunuMinusG5_h[i/2][i%2] = EvtLeptonTCurrent(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]) - EvtLeptonTG5Current(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]);
524 hbar_1PlusG5_h [i/2][i%2] = EvtLeptonSCurrent(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]) + EvtLeptonPCurrent(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]);
525 hbar_1MinusG5_h [i/2][i%2] = EvtLeptonSCurrent(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]) - EvtLeptonPCurrent(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]);
526 hbar_G5_h [i/2][i%2] = EvtLeptonPCurrent(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]);
527 hbar_h [i/2][i%2] = EvtLeptonSCurrent(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]);
528 hbar_Smunu_h [i/2][i%2] = EvtLeptonTCurrent(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]);
529 hbar_Gmu_h [i/2][i%2] = EvtLeptonVCurrent(parent->getDaug(0)->spParent(i/2),parent__spParent[i%2]);
532 for(i=0;i<4;i++) for(j=0;j<4;j++) {
533 //std::cout << "--------------------------------------------------" << std::endl;
534 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
535 Matrix[j/2][j%2][i/2][i%2] += lbar_Gmu_l[i/2][i%2] * (A1*hbar_GmuPlusG5_h[j/2][j%2]+B1*hbar_GmuMinusG5_h[j/2][j%2]);
536 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
537 //std::cout << "A1: " << A1 << " B1: " << B1 << " lbar_Gmu_l: " << lbar_Gmu_l[i/2][i%2] <<
538 // " hbar_GmuPlusG5_h: " << hbar_GmuPlusG5_h[j/2][j%2] << " hbar_GmuMinusG5_h: " << hbar_GmuMinusG5_h[j/2][j%2] <<
539 // " sp1: " << parent->getDaug(1)->spParent(i/2) << " sp2: " << parent->getDaug(1)->spParent(i%2) << std::endl;
540 Matrix[j/2][j%2][i/2][i%2] += lbar_Gmu_l[i/2][i%2] * (i1*A2*(hbar_SmunuPlusG5_h[j/2][j%2].cont2(q_mu))+B2*(hbar_SmunuMinusG5_h[j/2][j%2].cont2(q_mu)));
541 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
542 Matrix[j/2][j%2][i/2][i%2] += lbar_Gmu_l[i/2][i%2] * ((A3*hbar_1PlusG5_h[j/2][j%2]+B3*hbar_1MinusG5_h[j/2][j%2])*q_mu);
543 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
544 Matrix[j/2][j%2][i/2][i%2] += lbar_GmuG5_l[i/2][i%2] * (D1*hbar_GmuPlusG5_h[j/2][j%2]+E1*hbar_GmuMinusG5_h[j/2][j%2]);
545 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
546 Matrix[j/2][j%2][i/2][i%2] += lbar_GmuG5_l[i/2][i%2] * (i1*D2*(hbar_SmunuPlusG5_h[j/2][j%2].cont2(q_mu))+E2*(hbar_SmunuMinusG5_h[j/2][j%2].cont2(q_mu)));
547 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
548 Matrix[j/2][j%2][i/2][i%2] += lbar_GmuG5_l[i/2][i%2] * ((D3*hbar_1PlusG5_h[j/2][j%2]+E3*hbar_1MinusG5_h[j/2][j%2])*q_mu);
549 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
550 Matrix[j/2][j%2][i/2][i%2] += lbar_l[i/2][i%2] * (N1*hbar_h[j/2][j%2]+H1*hbar_G5_h[j/2][j%2]);
551 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
552 Matrix[j/2][j%2][i/2][i%2] += lbar_G5_l[i/2][i%2] * (N2*hbar_h[j/2][j%2]+H2*hbar_G5_h[j/2][j%2]);
553 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
554 Matrix[j/2][j%2][i/2][i%2] += cont(lbar_Smunu_l[i/2][i%2] , 4*C_T*f_T*hbar_Smunu_h[j/2][j%2]);
555 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
556 Matrix[j/2][j%2][i/2][i%2] +=
557 cont(lbar_Smunu_l[i/2][i%2] ,
558 -4*C_T*f_TV*i1*(EvtGenFunctions::directProd(q_mu,hbar_Gmu_h[j/2][j%2])-
559 EvtGenFunctions::directProd(hbar_Gmu_h[j/2][j%2],q_mu)));
560 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
561 Matrix[j/2][j%2][i/2][i%2] += cont(lbar_Smunu_l[i/2][i%2] , -4*C_T*f_TS*i1*(EvtGenFunctions::directProd(P_mu,q_mu)-EvtGenFunctions::directProd(q_mu,P_mu))*hbar_h[j/2][j%2]);
562 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
563 Matrix[j/2][j%2][i/2][i%2] += cont(lbar_ESmunu_l[i/2][i%2] , 4*C_TE*f_T*i1*hbar_Smunu_h[j/2][j%2]);
564 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
565 Matrix[j/2][j%2][i/2][i%2] += cont(lbar_ESmunu_l[i/2][i%2] , 4*C_TE*f_TV*(EvtGenFunctions::directProd(q_mu,hbar_Gmu_h[j/2][j%2])-EvtGenFunctions::directProd(hbar_Gmu_h[j/2][j%2],q_mu)));
566 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
567 Matrix[j/2][j%2][i/2][i%2] += cont(lbar_ESmunu_l[i/2][i%2] , 4*C_TE*f_TS*(EvtGenFunctions::directProd(P_mu,q_mu)-EvtGenFunctions::directProd(q_mu,P_mu))*hbar_h[j/2][j%2]);
568 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
569 //Matrix[j/2][j%2][i/2][i%2] *= G_F*alpha/4/sqrt(2)/EvtConst::pi*V_tb*conj(V_ts);
570 //std::cout << "Matrix = " << Matrix[j/2][j%2][i/2][i%2] << std::endl;
571 //std::cout << "--------------------------------------------------" << std::endl;
576 amp->vertex(spins,Matrix[j/2][j%2][i/2][i%2]);
579 //std::cout << "==================================================" << std::endl;
580 //std::cout << "Lambda_b0: " << parent->getP4Restframe() << std::endl;
581 //std::cout << "Lambda0: " << parent->getDaug(0)->getP4() << std::endl;
582 //std::cout << "mu-: " << parent->getDaug(1)->getP4() << std::endl;
583 //std::cout << "mu+: " << parent->getDaug(2)->getP4() << std::endl;
584 //std::cout << "P_mu: " << P_mu << std::endl;
585 //std::cout << "q_mu: " << q_mu << std::endl;
586 //std::cout << "q2: " << q2 << std::endl;
587 //std::cout << "==================================================" << std::endl;
592 EvtTensor4C EvtLb2Lll::EvtLeptonTG5Current(const EvtDiracSpinor &d,const EvtDiracSpinor &dp){
593 // <u|sigma^munu*gamma^5|v>
597 EvtComplex i2(0,0.5);
599 static EvtGammaMatrix mat01=EvtGammaMatrix::g0()*
600 (EvtGammaMatrix::g0()*EvtGammaMatrix::g1()-
601 EvtGammaMatrix::g1()*EvtGammaMatrix::g0())*EvtGammaMatrix::g5();
602 static EvtGammaMatrix mat02=EvtGammaMatrix::g0()*
603 (EvtGammaMatrix::g0()*EvtGammaMatrix::g2()-
604 EvtGammaMatrix::g2()*EvtGammaMatrix::g0())*EvtGammaMatrix::g5();
605 static EvtGammaMatrix mat03=EvtGammaMatrix::g0()*
606 (EvtGammaMatrix::g0()*EvtGammaMatrix::g3()-
607 EvtGammaMatrix::g3()*EvtGammaMatrix::g0())*EvtGammaMatrix::g5();
608 static EvtGammaMatrix mat12=EvtGammaMatrix::g0()*
609 (EvtGammaMatrix::g1()*EvtGammaMatrix::g2()-
610 EvtGammaMatrix::g2()*EvtGammaMatrix::g1())*EvtGammaMatrix::g5();
611 static EvtGammaMatrix mat13=EvtGammaMatrix::g0()*
612 (EvtGammaMatrix::g1()*EvtGammaMatrix::g3()-
613 EvtGammaMatrix::g3()*EvtGammaMatrix::g1())*EvtGammaMatrix::g5();
614 static EvtGammaMatrix mat23=EvtGammaMatrix::g0()*
615 (EvtGammaMatrix::g2()*EvtGammaMatrix::g3()-
616 EvtGammaMatrix::g3()*EvtGammaMatrix::g2())*EvtGammaMatrix::g5();
618 temp.set(0,1,i2*(d*(mat01*dp)));
619 temp.set(1,0,-temp.get(0,1));
621 temp.set(0,2,i2*(d*(mat02*dp)));
622 temp.set(2,0,-temp.get(0,2));
624 temp.set(0,3,i2*(d*(mat03*dp)));
625 temp.set(3,0,-temp.get(0,3));
627 temp.set(1,2,i2*(d*(mat12*dp)));
628 temp.set(2,1,-temp.get(1,2));
630 temp.set(1,3,i2*(d*(mat13*dp)));
631 temp.set(3,1,-temp.get(1,3));
633 temp.set(2,3,i2*(d*(mat23*dp)));
634 temp.set(3,2,-temp.get(2,3));