Reconstruction and identification of τ lepton decays to hadrons and ντat CMS

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This paper describes the algorithms used by the CMS experiment to reconstruct and identify τ → hadrons + ν τ decays during Run 1 of the LHC. The performance of the algorithms is studied in proton-proton collisions recorded at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb −1 . The algorithms achieve an identification efficiency of 50–60%, with misidentification rates for quark and gluon jets, electrons, and muons between per mille and per cent levels.