Event Description

The information in each event is stored as a row in a TTree object in the output ROOT file, with the branches documented in the following.

Cells

Note : only cells contained in topoclusters are stored in the output.

cell_layer : Which calorimeter layer the cell belongs to. 0 corresponds to ECAL1 and 5 corresponds to HCAL3

cell_x : x-coordinate of the cell

cell_y : y-coordinate of the cell

cell_z : z-coordinate of the cell

cell_eta : pseudo-rapidity of the cell

cell_phi : azimuthal angle of the cell

cell_e : total energy deposited in the cell

cell_che : total energy deposited in the cell by calorimeter shower component, which was initiated by a charged particle

cell_nue : total energy deposited in the cell by calorimeter shower component, which was initiated by a neutral particle

cell_topo_idx : Topocluster label to which the cell belongs

cell_parent_idx : index of parent particle which contributed the largest fraction of this cell’s energy

cell_conv_el_idx : index of conversion electron which contributed energy to this cell

cell_parent_list : list of parent particles which contributed to this cell’s energy in decreasing order of contribution

cell_parent_energy : list of energies that parent particles contributed to this cell in decreasing order of contribution

Tracks

track_parent_idx : index of parent particle corresponding to this track

track_pdgid : the PDG ID of the charged particle which creates the track

track_d0 : track perigee parameter d0, distance of perigee point from z-axis

track_z0 : track perigee parameter z0, distance of perigee point from xy-plane

track_theta : track perigee parameter theta

track_phi : track perigee parameter phi

track_qoverp : track perigee parameter q/p

track_reconstructed : track passes reconstruction efficiency cut

track_in_acceptance : track is inside the detector acceptance (reaches calorimeter and production vertex is inside ITS pixel layer 1)

track_x_layer_i : x-cordinate of the extrapolated track in the i-th calorimeter-layer

track_y_layer_i : y-cordinate of the extrapolated track in the i-th calorimeter-layer

track_z_layer_i : z-cordinate of the extrapolated track in the i-th calorimeter-layer

Nodes (of truth particle record)

node_{} : values for constructing the graph describing the truth particle record

Particles

particle_pdgid : vector storing PDG-ID of all the stable truth-particles in the event

particle_isIso : vector storing if the particle is isolated. If true, the value is 1.

particle_pt : transverse momentum of the stable particles

particle_eta : pseudo-rapidity of the stable particles

particle_phi : azimuthal angle of the stable particles

particle_e : energy of the stable particles

particle_prod_x : x-coordinate of the production vertex of the stable particles

particle_prod_y : y-coordinate of the production vertex of the stable particles

particle_prod_z : z-coordinate of the production vertex of the stable particles

particle_track_idx : index of the track corresponding to this particle

particle_eta_extrap_calo : pseudo-rapidity value at the point where the particle enters the calorimeter

particle_phi_extrap_calo : azimuthal angle at the point where the particle enters the calorimeter

particle_eta_extrap_its : same as above, for the end of the ITS

particle_phi_extrap_its : same as above, for the end of the ITS

particle_dep_energy : amount of energy deposited by this particle in the detector

Conversion electrons

conv_el_primary_photon_idx : index of the primary photon which conversion produced this electron

conv_el_q : charge of the conversion electron

conv_el_p{} : momentum in {x,y,z} direction of the conversion electron

conv_el_prod_{} : {x,y,z}-coordinate of the conversion vertex associated with this electron

Topoclusters

topo_idx : index of topocluster (starts at 1)

topo_bary_eta : pseudo-rapidity of the topocluster barycenter

topo_bary_phi : azimuthal angle of the topocluster barycenter

topo_bary_rho : radius in transverse plane of the topocluster barycenter

topo_bary_sigma_eta : width of topocluster in eta dimension

topo_bary_sigma_phi : width of topocluster in phi dimension

topo_e : total energy of topocluster

Superclusters

supercluster_e : total energy of supercluster

supercluster_phi : azimuthal angle of supercluster

supercluster_eta : pseudo-rapidity of supercluster

supercluster_seed_e : energy of topocluster used as seed for the supercluster

supercluster_track_{} : properties of the track associated with the seed used for the supercluster

supercluster_topos : list of topoclusters included in this supercluster

supercluster_track : index of track associated with supercluster seed

supercluster_conv_track : index of conversion track in case of supercluster for photon conversion

supercluster_pdgid : either 22 or +/-11 depending on the truth link of the track or the conversion vertex

supercluster_N : number of clusters included in this supercluster

Graph edges

track_to_cell_edge_start : list of track indices used as source nodes in track-to-cell edges

track_to_cell_edge_end : list of cell indices used as destination nodes in track-to-cell edges

cell_to_cell_edge_start : list of cell indices used as source nodes in cell-to-cell edges

cell_to_cell_edge_end : list of cell indices used as destination nodes in cell-to-cell edges

particle_to_node_idx : list of truth links to node j which particle i contributed energy to

particle_to_node_weight : list of the fractions of node j’s energy which particle i contributed

Jets

true_jet_pt : transverse component of momentum 3-vector of the jet built from truth particle

true_jet_eta : pseudo-rapidity of momentum 3-vector of the jet built from truth particles

true_jet_phi : azimuthal angle of momentum 3-vector of the jet built from truth particles

true_jet_m : mass of momentum 3-vector of the jet built from truth particles

topo_jet_pt : transverse component of momentum 3-vector of the jet built from topoclusters

topo_jet_eta : pseudo-rapidity of momentum 3-vector of the jet built from topoclusters

topo_jet_phi : azimuthal angle of momentum 3-vector of the jet built from topoclusters

topo_jet_m : mass of momentum 3-vector of the jet built from topoclusters

topo_jet_constituents_list : list of topoclusters comprising the topo jet