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

## Abstract

A measurement of the $H\rightarrow \tau\tau$ 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 $13 TeV$. The data set corresponds to an integrated luminosity of $35.9 fb^{-1}$. The e $H\rightarrow \tau\tau$ 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 e $H\rightarrow \tau\tau$ signal production cross section and branching fraction is $1.09^{+0.27}_{-0.26}$ 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.

## Abstract

A measurement of the $H\rightarrow \tau\tau$ 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 $13 TeV$. The data set corresponds to an integrated luminosity of $35.9 fb^{-1}$. The e $H\rightarrow \tau\tau$ 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 e $H\rightarrow \tau\tau$ signal production cross section and branching fraction is $1.09^{+0.27}_{-0.26}$ 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.

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