Cross-section measurements of the Higgs boson decaying into a pair of τ-leptons in proton-proton collisions at √s=13 TeV with the ATLAS detector [Elektronisk resurs]

• A measurement of production cross sections of the Higgs boson in proton-proton collisions is presented in the H  →  τ τ decay channel. The analysis is performed using 36.1 fb -1 of data recorded by the ATLAS experiment at the Large Hadron Collider at a center-of-mass energy of √ s = 13 TeV. All combinations of leptonic ( τ  → l v v ‾ with l = e , μ ) and hadronic ( τ → hadrons v ) τ decays arc considered. The H  →  τ τ signal over the expected background from other Standard Model processes is established with an observed (expected) significance of 4.4 (4.1) standard deviations. Combined with results obtained using data taken at 7 and 8 TeV center-of-mass energies, the observed (expected) significance amounts to 6.4 (5.4) standard deviations and constitutes an observation of H  →  τ τ decays. Using the data taken at √ s = 13 TeV, the total cross section in the  H  →  τ τ decay channel is measured to be 3.77 +0.60 -0.59 (stat) +0.87 -0.74 (syst) pb, for a Higgs boson of mass 125 GeV assuming the relative contributions of its production modes as predicted by the Standard Model. Total cross sections in the  H  →  τ τ decay channel are determined separately for vector-boson-fusion production and gluon-gluon-fusion production to be σ VBF H   →  τ τ = 0.28 ± 0.09 (stat) +0.11 -0.09 (syst) pb and σ ggF H   →  τ τ = 3.1 ± 1.0 (stat) +1.6 -1.3 (syst) pb, respectively. Similarly, results of a fit are reported in the framework of simplified template cross sections. All measurements are in agreement with Standard Model expectations. 

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