def simparticle(ptc, index):
'''Create a sim particle to be used in papas from an input particle.
'''
tp4 = ptc.p4()
vertex = ptc.start_vertex().position()
charge = ptc.q()
pid = ptc.pdgid()
simptc = Particle(tp4, vertex, charge, pid)
simptc.set_dagid(IdCoder.make_id(IdCoder.PFOBJECTTYPE.PARTICLE, index, 's', simptc.idvalue))
pdebugger.info(" ".join(("Made", simptc.__str__())))
#simptc.gen_ptc = ptc
#record that sim particle derives from gen particle
child = papasevent.history.setdefault(simptc.dagid(), Node(simptc.dagid())) #creates a new node if it is not there already
parent = papasevent.history.setdefault(ptc.dagid(), Node(ptc.dagid()))
parent.add_child(child)
return simptc
def reconstruct_cluster(self, cluster, layer, parent_ids,
energy=None, vertex=None):
'''construct a photon if it is an ecal
construct a neutral hadron if it is an hcal
'''
if self.locked[cluster.uniqueid]:
return
if vertex is None:
vertex = TVector3()
pdg_id = None
propagate_to = None
if layer=='ecal_in':
pdg_id = 22 #photon
propagate_to = [ self.detector.elements['ecal'].volume.inner ]
elif layer=='hcal_in':
pdg_id = 130 #K0
propagate_to = [ self.detector.elements['ecal'].volume.inner,
self.detector.elements['hcal'].volume.inner ]
else:
raise ValueError('layer must be equal to ecal_in or hcal_in')
assert(pdg_id)
mass, charge = particle_data[pdg_id]
if energy is None:
energy = cluster.energy
if energy < mass:
return None
if mass == 0:
momentum = energy #avoid sqrt for zero mass
else:
momentum = math.sqrt(energy**2 - mass**2)
p3 = cluster.position.Unit() * momentum
p4 = TLorentzVector(p3.Px(), p3.Py(), p3.Pz(), energy) #mass is not accurate here
particle = Particle(p4, vertex, charge, pdg_id)
particle.set_dagid(IdCoder.make_id(IdCoder.PFOBJECTTYPE.PARTICLE, len(self.particles), 'r', particle.idvalue))
# alice: this may be a bit strange because we can make a photon
# with a path where the point is actually that of the hcal?
# nb this only is problem if the cluster and the assigned layer
# are different
propagator(charge).propagate([particle],
propagate_to)
#merge Nov 10th 2016 not sure about following line (was commented out in papasevent branch)
particle.clusters[layer] = cluster # not sure about this either when hcal is used to make an ecal cluster?
self.locked[cluster.uniqueid] = True #just OK but not nice if hcal used to make ecal.
pdebugger.info(str('Made {} from {}'.format(particle, cluster)))
self.insert_particle(parent_ids, particle)
def reconstruct_track(self, track, pdgid, parent_ids,
clusters=None): # cluster argument does not ever seem to be used at present
'''construct a charged hadron from the track
'''
if self.locked[track.uniqueid]:
return
vertex = track.path.points['vertex']
pdgid = pdgid * track.charge
mass, charge = particle_data[pdgid]
p4 = TLorentzVector()
p4.SetVectM(track.p3() , mass)
particle = Particle(p4, vertex, charge, pdgid)
particle.set_dagid(IdCoder.make_id(IdCoder.PFOBJECTTYPE.PARTICLE, len(self.particles), 'r', particle.idvalue))
#todo fix this so it picks up smeared track points (need to propagagte smeared track)
particle.set_track(track) #refer to existing track rather than make a new one
self.locked[track.uniqueid] = True
pdebugger.info(str('Made {} from {}'.format(particle, track)))
self.insert_particle(parent_ids, particle)
return particle
def simparticle(ptc, index):
'''Create a sim particle to be used in papas from an input particle.
'''
tp4 = ptc.p4()
vertex = ptc.start_vertex().position()
charge = ptc.q()
pid = ptc.pdgid()
simptc = Particle(tp4, vertex, charge, pid)
simptc.set_dagid(
IdCoder.make_id(IdCoder.PFOBJECTTYPE.PARTICLE, index, 's',
simptc.idvalue))
pdebugger.info(" ".join(("Made", simptc.__str__())))
#simptc.gen_ptc = ptc
#record that sim particle derives from gen particle
child = papasevent.history.setdefault(
simptc.dagid(), Node(simptc.dagid(
))) #creates a new node if it is not there already
parent = papasevent.history.setdefault(ptc.dagid(),
Node(ptc.dagid()))
parent.add_child(child)
return simptc
