Silicon Bethe Bloch Muon ( Geant ) Proton ( Geant ) Electron ( Geant ) βγ

We report in this note a study of particle identification by pu lse height information in the CMS tracker, in the context of isolated tracks as well as tracks inside a ha dron jet. We have used the simulation package CMSIM and the tracker layout described in the Techni cal Design Report. We describe the discrimination efficiency between π andK as well as the electron identification capability of the stand-alone CMS tracker. a) Tata Institute of Fundamental Research EHEP, Mumbai b) CERN, European Laboratory for Particle Physics, Geneva c) University of Pisa and INFN, Pisa d) On leave from ITEP, Moscow, Russia