def reconstruct_track(self, track, clusters=None):
vertex = track.path.points['vertex']
pdg_id = 211 * track.charge
mass, charge = particle_data[pdg_id]
p4 = TLorentzVector()
p4.SetVectM(track.p3, mass)
particle = Particle(p4, vertex, charge, pdg_id)
particle.set_path(track.path)
particle.clusters = clusters
track.locked = True
return particle
