• Open Access

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

M. Aaboud et al. (ATLAS Collaboration)
Phys. Rev. D 99, 072001 – Published 10 April 2019

Abstract

A measurement of production cross sections of the Higgs boson in proton-proton collisions is presented in the Hττ decay channel. The analysis is performed using 36.1fb1 of data recorded by the ATLAS experiment at the Large Hadron Collider at a center-of-mass energy of s=13TeV. All combinations of leptonic (τvv¯ with =e,μ) and hadronic (τhadronsv) τ decays are considered. The Hττ 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 Hττ decays. Using the data taken at s=13TeV, the total cross section in the Hττ decay channel is measured to be 3.770.59+0.60(stat)0.74+0.87(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 Hττ decay channel are determined separately for vector-boson-fusion production and gluon-gluon-fusion production to be σHττVBF=0.28±0.09(stat)0.09+0.11(syst)pb and σHττggF=3.1±1.0(stat)1.3+1.6(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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  • Received 22 November 2018

DOI:https://doi.org/10.1103/PhysRevD.99.072001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

© 2019 CERN, for the ATLAS Collaboration

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Vol. 99, Iss. 7 — 1 April 2019

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