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Table 1 Input variables of the ANNPID classifiers for the various subsystems of the LHCb detector

From: Selection and processing of calibration samples to measure the particle identification performance of the LHCb experiment in Run 2

Tracking
 Total momentum
 Transverse momentum
 Quality of the track fit
 Number of clusters associated to the track
 ANN response trained to reject ghost tracks [42]
 Quality of the fit matching track segments upstream and downstream of the magnet
RICH detectors
 Geometrical acceptance of the three radiators, depending on the direction of the track
 Kinematical acceptance due to Cherenkov threshold for muons and kaons
 Likelihood of the electron, muon, kaon, and proton hypotheses relative to the pion
 Likelihood ratio of the below-threshold and pion hypotheses
Electromagnetic calorimeter
 Likelihood ratio of the electron and hadron hypotheses
 Likelihood ratio of the muon and hadron hypotheses
 Matching of the track with the clusters in the preshower detector
 Likelihood ratio of the electron and pion hypotheses, after recovery of the Bremsstrahlung photons
Hadronic calorimeter
 Likelihood ratio of the electron and hadron hypotheses
 Likelihood ratio of the muon and hadron hypotheses
Muon system
 Geometrical acceptance
 Loose binary requirement already available in the hardware trigger
 Likelihood of the muon hypothesis
 Likelihood of the non-muon hypothesis
 Number of clusters associated to at least another track