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

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