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Observation of the Higgs boson decay to a pair of τ leptons with the CMS detector

A measurement of the H → ττ signal strength is performed using events recorded in proton-proton collisions by the CMS experiment at the LHC in 2016 at a center-of-mass energy of 13TeV. The data set corresponds to an integrated luminosity of 35.9fb-1. The H → ττ signal is established with a significance of 4.9 standard deviations, to be compared to an expected significance of 4.7 standard deviations. The best fit of the product of the observed H → ττ signal production cross section and branching fraction is 1.09-0.26+0.27 times the standard model expectation. The combination with the corresponding measurement performed with data collected by the CMS experiment at center-of-mass energies of 7 and 8TeV leads to an observed significance of 5.9 standard deviations, equal to the expected significance. This is the first observation of Higgs boson decays to τ leptons by a single experiment.

Physics Letters B 2018, 779, 283

A.Al-bataineh,P.Baringer,A.Bean,S.Boren,J.Bowen,J.Castle,S.Khali,A.Kropivnitskaya,D.Majumder,W.Mcbrayer,M.Murray,C.Royon,S.Sanders,E.Schmitz,J.D.Tapia Takaki,Q.Wang & CMS Collab.

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