Global Particle ID Software in LHCb


This page contains technical information on the global Particle ID software in LHCb.


Sub-Detector Particle Identification in Brunel

Particle Identification starts with the sub detector specific reconstruction phases that run during normal processing in Brunel. These run algorithms specific to each sub-detector and store their final results in various summary objects in the T.E.S.


The main output of the RICH processing are RichPID data objects. These summarise the particle identification results for each track. The results are presented in the form a of delta log likelihood value for each mass hypothesis, that gives the overall change in the global event log likelihood when the track is question is changed from the pion mass hypothesis, the the hypothesis in question.

More details can be found on the RichSoftware pages.


The output from the Muon system PID algorithms are MuonPID data objects, which like the RICH summarise the PID information for each track.

More details can be found on the MuonSoftware pages.


* To Be Filled *


At the end of of the Brunel event processing, a final stage is run which forms ProtoParticle data objects. These objects are designed to represent a single reconstructed object (charged or neutral) in LHCB and to summarise all the quantities associated to that object.

Gobal Particle ID

One task of the Global PID group is to study how best to merge all the sources of PID information (RICH, CALO, MUON etc.) to provide the best overall particle ID estimators.


Global PID was first introduced during the analysis of the DC04 data. The original study was performed by Roger Forty. For futher information, see these emails from Roger.

ChrisRJones - 17 Nov 2006
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Topic revision: r2 - 2006-11-20 - unknown
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