Measurements of Higgs boson production cross-sections in the H → τ +τ − decay channel in pp collisions at √s = 13 TeV with the ATLAS detector

Measurements of the production cross-sections of the Standard Model (SM)
Higgs boson (H) decaying into a pair of τ -leptons are presented. The measurements use data collected with the ATLAS detector from pp collisions produced at the Large Hadron Collider at a centre-of-mass energy of √s = 13 TeV , corresponding to an integrated luminosity of 139 fb−1. Leptonic (τ → `ν`ντ ) and hadronic (τ → hadrons ντ ) decays of the τ -lepton are considered. All measurements account for the branching ratio of H → τ τ and are performed with a requirement |yH | < 2.5, where yH is the true Higgs boson rapidity. The cross-section of the pp → H → τ τ process is measured to be 2.94 ±0.21(stat)+ 0.37− 0.32(syst) pb, in agreement with the SM prediction of 3.17 ± 0.09 pb . Inclusive cross-sections are determined separately for the four dominant production modes: 2.65 ±0.41(stat)+ 0.91− 0.67(syst) pb for gluon-gluon fusion, 0.197 ± 0.028(stat)+ 0.032 − 0.026(syst) pb for vector-boson fusion, 0.115 ± 0.058(stat)+ 0.042− 0.040(syst) pb for vector-boson associated production, and 0.033 ± 0.031(stat)+ 0.022− 0.017(syst) pb for top-quark pair associated production. Measurements in exclusive regions of the phase space, using the simplified template cross-section framework, are also performed. All results are in agreement with the SM predictions.