Abstract
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.
Highlights
Searches for new phenomena that consider signatures with τ leptons have gained great interest in proton-proton collisions at the CERN LHC
Searches with τ leptons in the final state have high sensitivity to the production of both neutral and charged Higgs bosons expected in the minimal supersymmetric standard model (MSSM) [3, 4], in which enhancements in the couplings to τ leptons can be substantial at large tanβ, where tanβ is the ratio of vacuum expectation values of the two Higgs doublets in the MSSM
2. “against-μ tight”: τh candidates fail this working point when they fail condition (i), or when a hit is present in the cathode strip chambers (CSCs), drift tubes (DTs), or resistive-plate chambers (RPCs) detectors located in the two outermost muon stations within a cone of size ∆R = 0.3 around the τh direction
Summary
Searches for new phenomena that consider signatures with τ leptons have gained great interest in proton-proton (pp) collisions at the CERN LHC. Searches with τ leptons in the final state have high sensitivity to the production of both neutral and charged Higgs bosons expected in the minimal supersymmetric standard model (MSSM) [3, 4], in which enhancements in the couplings to τ leptons can be substantial at large tanβ, where tanβ is the ratio of vacuum expectation values of the two Higgs doublets in the MSSM. Examples of such searches can be found in refs.
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