PID Lists

This page lists the basic (charged) Particle Identification (PID) lists produced at run-time. The PID lists consist of particles that pass a given PID selector. Each PID selector uses a number of PID variables to accept or reject a given track. The variables used for each type of particle are listed in the tables. Currently, the PID group provides several different types of PID selector:

The PID lists are produced by the BetaPid package.

For more information and detailed documentation of each selector, see the PID homepage, in particular the PID selectors documentation page.

Electrons

Variable Description
E/p Ratio of energy deposited in the calorimeter, to track momentum.
Ncry Number of EMC crystals hit
LAT Lateral energy distribution
A42 Zernike moment
dE/dx Energy loss in the DCH
theta_c Cerenkov angle in the DRC
N_gamma Number of photons in DRC
N_gamma_exp Number of photons expected
Delta_phi Track-bump separation
Selector Type Lists
Cut-based ("Micro") eMicroNoCal
eMicroVeryLoose
eMicroLoose
eMicroTight
eMicroVeryTight
Likelihood ("LH") PidLHElectrons
Roy ("Roy") eRoyLoose

Muons

Variable Description
Ecand Energy released in the EMC.
NL Number of IF hit layers in a cluster
Lambda_meas Measured number of interaction lengths traversed.
Delta_Lambda Difference between the expected (for muons) and measured number of interaction lengths traversed..
chi2fit chi2/dof of IFR hit strips in a polynomial fit of the cluster.
chi2mat chi2/dof of the IFR hit strips in the track extrapolation.
Tc Track continuity.
m and sigma_m Average multiplicity of hit strips per layer, and its standard deviation.
Selector Type Lists
Cut-based ("Micro") muMicroMinimumIonizing muMicroVeryLoose
muMicroLoose
muMicroTight
muMicroVeryTight
Neural Net muNNVeryLoose
muNNLoose
muNNTight
muNNVeryTight

muNNVeryLooseFakeRate
muNNLooseFakeRate
muNNTightFakeRate
muNNVeryTightFakeRate
Likelihood muLikeVeryLoose
muLikeLoose
muLikeTight

Kaons

Variable Description
dE/dx Energy loss in the SVT and DCH
theta_c Cerenkov angle in the DRC
N_gamma Number of photons in DRC
N_gamma_exp Number of photons expected
Selector Type Lists
Neural Network ("Micro") KMicroVeryLoose
KMicroLoose
KMicroTight
KMicroVeryTight
KMicroNotPion
KMicroNotPionGTL
Roy ("Roy") KRoyLoose
KRoyDefault
KRoyNotPion
KRoyNotPionOrUnknown
Simple (K-ID cut only) KSimpleLoose
KSimpleTight
Neural Network KNNVeryLoose
KNNLoose
KNNTight
KNNVeryTight
KNNNotPion
Likelihood KLHNotPion KLHVeryLoose
KLHLoose
KLHTight
KLHVeryTight
KLHNotPionGTL KGLHTight

Pions

Variable Description
dE/dx Energy loss in the SVT and DCH
theta_c Cerenkov angle in the DRC
N_gamma Number of photons in DRC
TrkQual Track quality
iselectron Whether the track passes the LH electron selector
ismuon Whether the track passes the MicroVeryTight muon selector
Selector Type Lists
Likelihood ("LH") piLHVeryLoose
piLHLoose
piLHTight
piLHVeryTight
piGLHTight
Roy ("Roy") piRoyLoose
piRoyNotKaon

Protons

Variable Description
dE/dx Energy loss in the SVT and DCH
theta_c Cerenkov angle in the DRC
N_gamma Number of photons in DRC
TrkQual Track quality
iselectron Whether the track passes the LH electron selector
ismuon Whether the track passes the MicroVeryTight muon selector
Selector Type Lists
Likelihood ("LH") pLHVeryLoose
pLHLoose
pLHTight
pLHVeryTight
pGLHTight

PID SubLists (SmpPidRefineProdSequence.tcl)

Candidate must be a member of BOTH lists.
muNNTightGTL muNNTight
GoodTracksLoose
PidLHElectronsGTL PidLHElectrons
GoodTracksLoose
piLHLooseGTVL piLHLoose
GoodTracksVeryLoose
piLHLooseGTL piLHLoose
GoodTracksLoose
muNotEl mNNTight
NOT eLHBremAndGTL
eLooseNoCal eMicroNoCal
eMicroLoose
eOrMuBremAndGTL muNotEl
eLHBremAndGTL

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