1 //--------------------------------------------------------------------------
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.
8 // Copyright Information: See EvtGen/COPYRIGHT
9 // Copyright (C) 1998 Caltech, UCSB
11 // Module: EvtDecayParm.cc
13 // Description: Store decay parameters for one decay.
15 // Modification history:
17 // RYD April 5, 1997 Module created
19 //------------------------------------------------------------------------
21 #include "EvtGenBase/EvtPatches.hh"
22 #include "EvtGenBase/EvtPatches.hh"
27 #include "EvtGenBase/EvtParticleDecayList.hh"
28 #include "EvtGenBase/EvtParticle.hh"
29 #include "EvtGenBase/EvtRandom.hh"
30 #include "EvtGenBase/EvtReport.hh"
31 #include "EvtGenBase/EvtPDL.hh"
32 #include "EvtGenBase/EvtStatus.hh"
36 EvtParticleDecayList::EvtParticleDecayList(const EvtParticleDecayList &o) {
38 _rawbrfrsum=o._rawbrfrsum;
39 _decaylist=new EvtParticleDecayPtr[_nmode];
42 for(i=0;i<_nmode;i++){
43 _decaylist[i]=new EvtParticleDecay;
45 EvtDecayBase *tModel=o._decaylist[i]->getDecayModel();
47 EvtDecayBase *tModelNew=tModel->clone();
48 if (tModel->getPHOTOS()){
49 tModelNew->setPHOTOS();
51 if (tModel->verbose()){
52 tModelNew->setVerbose();
54 if (tModel->summary()){
55 tModelNew->setSummary();
57 std::vector<std::string> args;
59 for(j=0;j<tModel->getNArg();j++){
60 args.push_back(tModel->getArgStr(j));
62 tModelNew->saveDecayInfo(tModel->getParentId(),tModel->getNDaug(),
66 tModel->getModelName(),
67 tModel->getBranchingFraction());
68 _decaylist[i]->setDecayModel(tModelNew);
70 _decaylist[i]->setBrfrSum(o._decaylist[i]->getBrfrSum());
71 _decaylist[i]->setMassMin(o._decaylist[i]->getMassMin());
78 EvtParticleDecayList::~EvtParticleDecayList(){
81 for(i=0;i<_nmode;i++){
85 if (_decaylist!=0) delete [] _decaylist;
88 void EvtParticleDecayList::printSummary(){
91 for(i=0;i<_nmode;i++){
92 _decaylist[i]->printSummary();
97 void EvtParticleDecayList::removeDecay(){
100 for(i=0;i<_nmode;i++){
101 delete _decaylist[i];
104 delete [] _decaylist;
111 EvtDecayBase* EvtParticleDecayList::getDecayModel(int imode) {
113 EvtDecayBase* theModel(0);
114 if (imode >= 0 && imode < _nmode) {
115 EvtParticleDecay* theDecay = _decaylist[imode];
117 theModel = theDecay->getDecayModel();
125 EvtDecayBase* EvtParticleDecayList::getDecayModel(EvtParticle *p){
127 if (p->getNDaug()!=0) {
128 assert(p->getChannel()>=0);
129 return getDecay(p->getChannel()).getDecayModel();
131 if (p->getChannel() >(-1) ) {
132 return getDecay(p->getChannel()).getDecayModel();
136 if (getNMode()==0 ) {
139 if (getRawBrfrSum()<0.00000001 ) {
145 return getDecay(0).getDecayModel();
148 if (p->getChannel() >(-1)) {
149 report(ERROR,"EvtGen") << "Internal error!!!"<<endl;
155 for (j=0;j<10000000;j++){
157 double u=EvtRandom::Flat();
161 for (i=0;i<getNMode();i++) {
163 if ( breakL ) continue;
164 if (u<getDecay(i).getBrfrSum()) {
166 //special case for decay of on particel to another
169 if (getDecay(i).getDecayModel()->getNDaug()==1 ) {
171 return getDecay(i).getDecayModel();
174 if ( p->hasValidP4() ) {
175 if (getDecay(i).getMassMin() < p->mass() ) {
177 return getDecay(i).getDecayModel();
181 //Lange apr29-2002 - dont know the mass yet
183 return getDecay(i).getDecayModel();
189 //Ok, we tried 10000000 times above to pick a decay channel that is
190 //kinematically allowed! Now we give up and search all channels!
191 //if that fails, the particle will not be decayed!
193 report(ERROR,"EvtGen") << "Tried 10000000 times to generate decay of "
194 << EvtPDL::name(p->getId())<< " with mass="<<p->mass()<<endl;
195 report(ERROR,"EvtGen") << "Will take first kinematically allowed decay in the decay table"
200 //Need to check that we don't use modes with 0 branching fractions.
201 double previousBrSum=0.0;
202 for (i=0;i<getNMode();i++) {
203 if(getDecay(i).getBrfrSum()!=previousBrSum){
204 if ( getDecay(i).getMassMin() < p->mass() ) {
206 return getDecay(i).getDecayModel();
209 previousBrSum=getDecay(i).getBrfrSum();
212 report(ERROR,"EvtGen") << "Could not decay:"
213 <<EvtPDL::name(p->getId()).c_str()
214 <<" with mass:"<<p->mass()
215 <<" will throw event away! "<<endl;
217 EvtStatus::setRejectFlag();
223 void EvtParticleDecayList::setNMode(int nmode){
225 EvtParticleDecayPtr* _decaylist_new= new EvtParticleDecayPtr[nmode];
228 report(ERROR,"EvtGen") << "Error _nmode not equal to zero!!!"<<endl;
232 delete [] _decaylist;
234 _decaylist=_decaylist_new;
240 EvtParticleDecay& EvtParticleDecayList::getDecay(int nchannel) const {
241 if (nchannel>=_nmode) {
242 report(ERROR,"EvtGen") <<"Error getting channel:"
243 <<nchannel<<" with only "<<_nmode
247 return *(_decaylist[nchannel]);
250 void EvtParticleDecayList::makeChargeConj(EvtParticleDecayList* conjDecayList){
252 _rawbrfrsum=conjDecayList->_rawbrfrsum;
254 setNMode(conjDecayList->_nmode);
258 for(i=0;i<_nmode;i++){
259 _decaylist[i]=new EvtParticleDecay;
260 _decaylist[i]->chargeConj(conjDecayList->_decaylist[i]);
265 void EvtParticleDecayList::addMode(EvtDecayBase* decay, double brfrsum,
268 EvtParticleDecayPtr* newlist=new EvtParticleDecayPtr[_nmode+1];
271 for(i=0;i<_nmode;i++){
272 newlist[i]=_decaylist[i];
277 newlist[_nmode]=new EvtParticleDecay;
279 newlist[_nmode]->setDecayModel(decay);
280 newlist[_nmode]->setBrfrSum(brfrsum);
281 newlist[_nmode]->setMassMin(massmin);
283 EvtDecayBase *newDec=newlist[_nmode]->getDecayModel();
284 for(i=0;i<_nmode;i++){
285 if ( newDec->matchingDecay(*(newlist[i]->getDecayModel())) ) {
288 if ( newDec->getModelName() == "JETSET" || newDec->getModelName() == "PYTHIA" ) continue;
289 if ( newDec->getModelName() == "JSCONT" || newDec->getModelName() == "PYCONT" ) continue;
290 if ( newDec->getModelName() == "PYGAGA" ) continue;
291 if ( newDec->getModelName() == "LUNDAREALAW" ) continue;
292 if ( newDec->getModelName() == "TAUOLA") continue;
293 report(ERROR,"EvtGen") << "Two matching decays with same parent in decay table\n";
294 report(ERROR,"EvtGen") << "Please fix that\n";
295 report(ERROR,"EvtGen") << "Parent " << EvtPDL::name(newDec->getParentId()).c_str() << endl;
296 for (int j=0; j<newDec->getNDaug(); j++)
297 report(ERROR,"EvtGen") << "Daughter " << EvtPDL::name(newDec->getDaug(j)).c_str() << endl;
303 delete [] _decaylist;
306 if ( ( _nmode == 0 ) && ( _decaylist != 0 ) ) delete [] _decaylist ;
315 void EvtParticleDecayList::finalize(){
318 if ( _rawbrfrsum< 0.000001 ) {
319 report(ERROR,"EvtGen") << "Please give me a "
320 << "branching fraction sum greater than 0\n";
323 if (fabs(_rawbrfrsum-1.0)>0.0001) {
324 report(INFO,"EvtGen") <<"Warning, sum of branching fractions for "
325 <<EvtPDL::name(_decaylist[0]->getDecayModel()->getParentId()).c_str()
326 <<" is "<<_rawbrfrsum<<endl;
327 report(INFO,"EvtGen") << "rescaled to one! "<<endl;
333 for(i=0;i<_nmode;i++){
334 double brfrsum=_decaylist[i]->getBrfrSum()/_rawbrfrsum;
335 _decaylist[i]->setBrfrSum(brfrsum);
343 EvtParticleDecayList& EvtParticleDecayList::operator=(const EvtParticleDecayList &o) {
347 _rawbrfrsum=o._rawbrfrsum;
348 _decaylist=new EvtParticleDecayPtr[_nmode];
351 for(i=0;i<_nmode;i++){
352 _decaylist[i]=new EvtParticleDecay;
354 EvtDecayBase *tModel=o._decaylist[i]->getDecayModel();
356 EvtDecayBase *tModelNew=tModel->clone();
357 if (tModel->getPHOTOS()){
358 tModelNew->setPHOTOS();
360 if (tModel->verbose()){
361 tModelNew->setVerbose();
363 if (tModel->summary()){
364 tModelNew->setSummary();
366 std::vector<std::string> args;
368 for(j=0;j<tModel->getNArg();j++){
369 args.push_back(tModel->getArgStr(j));
371 tModelNew->saveDecayInfo(tModel->getParentId(),tModel->getNDaug(),
375 tModel->getModelName(),
376 tModel->getBranchingFraction());
377 _decaylist[i]->setDecayModel(tModelNew);
379 //_decaylist[i]->setDecayModel(tModel);
380 _decaylist[i]->setBrfrSum(o._decaylist[i]->getBrfrSum());
381 _decaylist[i]->setMassMin(o._decaylist[i]->getMassMin());
390 void EvtParticleDecayList::removeMode(EvtDecayBase* decay) {
391 // here we will delete a decay with the same final state particles
392 // and recalculate the branching fractions for the remaining modes
397 for(i=0;i<_nmode;i++){
398 if ( decay->matchingDecay(*(_decaylist[i]->getDecayModel())) ) {
404 report(ERROR,"EvtGen") << " Attempt to remove undefined mode for" << endl
405 << "Parent " << EvtPDL::name(decay->getParentId()).c_str() << endl
407 for (int j=0; j<decay->getNDaug(); j++)
408 report(ERROR,"") << EvtPDL::name(decay->getDaug(j)).c_str() << " ";
409 report(ERROR,"") << endl;
414 match_bf = _decaylist[match]->getBrfrSum();
416 match_bf = (_decaylist[match]->getBrfrSum()
417 -_decaylist[match-1]->getBrfrSum());
420 double divisor = 1-match_bf;
421 if (divisor < 0.000001 && _nmode > 1) {
422 report(ERROR,"EvtGen") << "Removing requested mode leaves "
423 << EvtPDL::name(decay->getParentId()).c_str()
424 << " with zero sum branching fraction," << endl
425 << "but more than one decay mode remains. Aborting."
430 EvtParticleDecayPtr* newlist=new EvtParticleDecayPtr[_nmode-1];
432 for(i=0;i<match;i++){
433 newlist[i]=_decaylist[i];
434 newlist[i]->setBrfrSum(newlist[i]->getBrfrSum()/divisor);
436 for(i=match+1; i<_nmode; i++) {
437 newlist[i-1]=_decaylist[i];
438 newlist[i-1]->setBrfrSum((newlist[i-1]->getBrfrSum()-match_bf)/divisor);
442 delete [] _decaylist;
449 delete [] _decaylist;
455 bool EvtParticleDecayList::isJetSet() const {
457 EvtDecayBase * decayer ;
462 decayer = getDecay( i ).getDecayModel ( ) ;
463 if ( decayer -> getModelName() == "PYTHIA" ) return true ;