Particle identification in LHCb

Particle identification (PID) is a fundamental requirement for LHCb. It is provided by RICH, Muon and Calorimeter sub-detectors. To maintain the integrity of the LHCb physics performance, it is essential to measure and monitor the PID efficiencies and mis-ID fractions over time. This can be done by using specific decays of certain particles, such as K0(S), phi, Lambda, J/psi and D*+, for which pure samples can be isolated using only kinematic quantities. These samples can then be used to calibrate the PID performance from data. This report presents preliminary PID results from early 2010 LHC runs at s**(1/2) = 7-TeV