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Performance of reconstruction and identification of τ leptons decaying to hadrons and ν_τ in pp collisions at √(s)= 13 TeV
CMS Collaboration
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The algorithm developed by the CMS Collaboration to reconstruct and identify τ leptons produced in proton-proton collisions at √(s)= 7 and 8 TeV, via their decays to hadrons and a neutrino, has been significantly improved. The changes include a revised reconstruction of π⁰ candidates, and improvements in multivariate discriminants to separate τ leptons from jets and electrons. The algorithm is extended to reconstruct τ leptons in highly Lorentz-boosted pair production, and in the high-level trigger. The performance of the algorithm is studied using proton-proton collisions recorded during 2016 at √(s)= 13 TeV, corresponding to an integrated luminosity of 35.9 fb⁻¹. The performance is evaluated in terms of the efficiency for a genuine τ lepton to pass the identification criteria and of the probabilities for jets, electrons, and muons to be misidentified as τ leptons. The results are found to be very close to those expected from Monte Carlo simulation.
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