Tau Reconstruction and Identification at the Compact Muon Solenoid

Abstract

New Physics beyond the Standard Model could appear at the LHC in final states with tau leptons. The development of efficient and accurate reconstruction and identification algorithms for taus decaying to hadrons is therefore an important item in the physics program of the Compact Muon Solenoid (CMS) experiment. New identification algorithms utilizing information about the known properties of tau hadronic decays have been recently developed and provide considerable performance improvements with respect to algorithms previously used by the CMS collaboration. Details of the strategies for identification of individual tau decay modes are presented in the following, as well as first measurements of the quark and gluon jet mis–tag rate with the first 8.4 nb − 1 of data collected at s = 7 TeV .