double Mixing_Handler::DetermineMixingTime(Particle* decayer,
bool checkforpartstatus) const
{
double time = decayer->Time();
Blob* motherblob = decayer->ProductionBlob();
if(motherblob->Type()==btp::Hadron_Mixing) {
decayer = motherblob->InParticle(0);
motherblob = decayer->ProductionBlob();
}
Particle* sister = NULL;
if(motherblob->Type()!=btp::Fragmentation ||
(motherblob->NInP()==2 && motherblob->NOutP()==2 &&
motherblob->InParticle(0)->Flav()==motherblob->OutParticle(0)->Flav() &&
motherblob->InParticle(1)->Flav()==motherblob->OutParticle(1)->Flav())) {
// check if particle was produced coherently
Particle_Vector sisters = motherblob->GetOutParticles();
for(Particle_Vector::const_iterator it=sisters.begin(); it!=sisters.end(); it++) {
if((*it)!=decayer && decayer->Flav()==(*it)->Flav().Bar()) {
sister = (*it);
break;
}
}
}
// in coherent production, special rules apply:
if(sister) {
if((checkforpartstatus && sister->Status()==part_status::decayed) ||
(!checkforpartstatus && sister->DecayBlob()))
{
time = time - sister->Time();
}
else time = 0.0;
}
return time;
}
void AnalyseEvent(Blob_List* blobs)
{
Blob* blob = blobs->FindFirst(btp::Hadron_Decay);
if(blob==NULL) return;
#ifdef USING__ROOT
Hadron_Decay_Channel* hdc=(*blob)["hdc"]->Get<Hadron_Decay_Channel*>();
int currenthist=0;
for(int i=0; i<blob->NOutP(); i++) {
double costheta = blob->OutParticle(i)->Momentum().CosTheta();
ThetaHists[hdc][currenthist]->Fill(costheta);
currenthist++;
}
currenthist=0;
for(int i=0; i<blob->NOutP(); i++) {
double energy = blob->OutParticle(i)->Momentum()[0];
EnergyHists[hdc][currenthist]->Fill(energy);
currenthist++;
}
currenthist=0;
for(int i=0; i<blob->NOutP(); i++) {
if(blob->NOutP()<3) break;
for(int j=i+1; j<blob->NOutP(); j++) {
Vec4D mom1 = blob->OutParticle(i)->Momentum();
Vec4D mom2 = blob->OutParticle(j)->Momentum();
double q2 = (mom1+mom2).Abs2();
TwoInvMassHists[hdc][currenthist]->Fill(q2);
currenthist++;
}
}
currenthist=0;
for(int i=0; i<blob->NOutP(); i++) {
if(blob->NOutP()<4) break;
for(int j=i+1; j<blob->NOutP(); j++) {
for(int k=j+1; k<blob->NOutP(); k++) {
Vec4D mom1 = blob->OutParticle(i)->Momentum();
Vec4D mom2 = blob->OutParticle(j)->Momentum();
Vec4D mom3 = blob->OutParticle(k)->Momentum();
double q2 = (mom1+mom2+mom3).Abs2();
ThreeInvMassHists[hdc][currenthist]->Fill(q2);
currenthist++;
}
}
}
#endif
}
void AnalyseEvent(Blob_List* blobs)
{
#ifdef USING__ROOT
// int outgoing = 1;
// int incoming = -1;
// Particle_List outparts = blobs->ExtractParticles(part_status::active, outgoing);
///////////////////////////////////////////////////////////////////////////////////
// analyse primary decay blob, ignore subsequent decays //
///////////////////////////////////////////////////////////////////////////////////
Blob * primarydecayblob = blobs->FindFirst(btp::Hadron_Decay);
// msg_Out()<<"primary decay blob:"<<endl<<*primarydecayblob<<endl;
// photon multiplicity and decay frame radiated energy (total)
unsigned int photmult = 0;
double photener = 0.;
for (int i=0; i<primarydecayblob->NOutP(); i++) {
if ((primarydecayblob->OutParticle(i)->Flav().IsPhoton() == true) &&
(primarydecayblob->OutParticle(i)->Info() == 'S')) {
photmult++;
photener = photener + primarydecayblob->OutParticle(i)->Momentum()[0];
}
}
photonmultiplicity->Fill(photmult);
if (photener != 0.) decayframeenergy->Fill(photener);
// multipole rest frame angles
Vec4D multipolesum = Vec4D(0.,0.,0.,0.);
Vec4D axis = Vec4D(0.,0.,0.,1.);
std::list<Vec4D> multipole;
std::list<Vec4D> newphot;
for (int i=0; i<primarydecayblob->NOutP(); i++) {
if (primarydecayblob->OutParticle(i)->Flav().Charge() != 0.) {
multipolesum = multipolesum + primarydecayblob->OutParticle(i)->Momentum();
multipole.push_back(primarydecayblob->OutParticle(i)->Momentum());
}
}
if (primarydecayblob->InParticle(0)->Flav().Charge() != 0) {
multipolesum = multipolesum + primarydecayblob->InParticle(0)->Momentum();
multipole.push_front(primarydecayblob->InParticle(0)->Momentum());
}
Poincare boost(multipolesum);
Poincare rotate;
// charged initial state: rotate such that initial state at theta = 0
if (mother_flav.Charge() != 0.) {
Vec4D inmom = *multipole.begin();
boost.Boost(inmom);
rotate = Poincare(inmom,axis);
}
// neutral initial state: rotate such that heaviest charged final state at theta = 0
else {
std::list<Vec4D>::iterator heaviest = multipole.begin();
for (std::list<Vec4D>::iterator iter=multipole.begin(); iter!=multipole.end(); iter++) {
if (abs((iter->Abs2() - heaviest->Abs2())/(iter->Abs2() + heaviest->Abs2())) > 1E-6) {
heaviest = iter;
}
}
boost.Boost(*heaviest);
rotate = Poincare(*heaviest,axis);
}
for (int i=0; i<primarydecayblob->NOutP(); i++) {
if (primarydecayblob->OutParticle(i)->Flav().IsPhoton() == true) {
Vec4D mom = primarydecayblob->OutParticle(i)->Momentum();
boost.Boost(mom);
rotate.Rotate(mom);
double theta = acos((Vec3D(mom)*Vec3D(axis))/(Vec3D(mom).Abs()*Vec3D(axis).Abs()));
multipoleframeangles->Fill(theta);
}
}
///////////////////////////////////////////////////////////////////////////////////
// inclusive analysis of whole decay chain //
///////////////////////////////////////////////////////////////////////////////////
// to be done ..
#endif
}