//============================================================================= // Return all descendants of level i for a Particle //============================================================================= const LHCb::Particle::ConstVector ParticleDescendants::descendants(const LHCb::Particle* P, int maxlevel){ LHCb::Particle::ConstVector Parts ; int level = 0 ; bool found = false ; LHCb::Particle::ConstVector mothers ; do { ++level ; LHCb::Particle::ConstVector leveldaughters ; if ( level == 1 ) found = addDaughters( P, leveldaughters) ; else found = addDaughters( mothers, leveldaughters) ; if ( level==maxlevel || maxlevel == 0 ) { Parts.insert(Parts.end(),leveldaughters.begin(),leveldaughters.end()) ; verbose() << "Level: " << level << " - inserted " << leveldaughters.size() << " daughters to get " << Parts.size() << endmsg ; } verbose() << "Level " << level << " of " << maxlevel << " : " << leveldaughters.size() << " daughters " << found << endmsg ; mothers = leveldaughters ; } while ( (maxlevel<=0 || level<=maxlevel) && found ) ; debug() << "Reached " << level << ". Returning " << Parts.size() << " daughters" << endmsg ; return Parts ; }
//============================================================================= // Return all daughters of particles in a vector //============================================================================= bool ParticleDescendants::addDaughters(const LHCb::Particle::ConstVector& mothers, LHCb::Particle::ConstVector& Parts){ if ( mothers.empty() ) return false ; bool found = false ; for ( LHCb::Particle::ConstVector::const_iterator i = mothers.begin() ; i!=mothers.end() ; ++i){ found = ( addDaughters( *i, Parts) || found ); } return found ; }
//============================================================================= // Return all daughters of particles in a vector //============================================================================= bool ParticleDescendants::addDaughters(const LHCb::Particle* M, LHCb::Particle::ConstVector& Parts){ if ( 0==M ) return false; if ( M->isBasicParticle() ) return false; const LHCb::Particle::ConstVector dauts = M->daughtersVector(); Parts.insert(Parts.end(),dauts.begin(),dauts.end()); verbose() << "Added " << dauts.size() << " daughters" << endmsg ; return (!dauts.empty()); }
//============================================================================= // Return all stable descendants of a Particle //============================================================================= const LHCb::Particle::ConstVector ParticleDescendants::finalStates(const LHCb::Particle* P){ LHCb::Particle::ConstVector stables ; // LHCb::Particle::ConstVector all = descendants( P, 0 ); // get them all all for ( LHCb::Particle::ConstVector::const_iterator i = all.begin() ; i!=all.end() ; ++i){ if ( (*i)->isBasicParticle() ) { stables.push_back( *i ); debug() << "Saving a " << (*i)->particleID().pid() << endmsg ; } else verbose() << "Discarding a " << (*i)->particleID().pid() << endmsg ; } return stables; }