Measurements of Higgs boson production cross-sections in the $H\to\tau^{+}\tau^{-}$ decay channel in $pp$ collisions at $\sqrt{s}=13\,\text{TeV}$ with the ATLAS detector

Measurements of the production cross-sections of the Standard Model (SM) Higgs boson ($H$) decaying into a pair of $\tau$ 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 $\sqrt{s}=13\,\text{TeV}$, corresponding to an integrated luminosity of $139\,\text{fb}^{-1}$. Leptonic ($\tau\to\ell\nu_{\ell}\,\nu_{\tau}$) and hadronic ($\tau\to\text{hadrons }\nu_{\tau}$) decays of the $\tau$ lepton are considered. All measurements account for the branching ratio of $H\to\tau\tau$ and are performed with a requirement $|y_H|<2.5$, where $y_H$ is the true Higgs boson rapidity. The production cross-section of the $pp\,\to\,H\,\to\,\tau\tau$ process is measured to be 2.90 $\pm$ 0.21 (stat) $^{+\,0.37}_{-\,0.32}$(syst) pb. Inclusive cross-sections are determined separately for the four dominant production modes: 2.7 $\pm$ 0.4 (stat) $^{+\,0.9}_{-\,0.6}$(syst) pb for the gluon-gluon fusion, 0.196 $^{+\,0.028}_{-\,0.027}$(stat) $^{+\,0.032}_{-\,0.025}$(syst) pb for the vector-boson fusion, 0.11 $\pm$ 0.06 (stat) $\pm$ 0.04 (syst) pb for the vector boson associated production, and 0.048 $^{+\,0.033}_{-\,0.029}$(stat) $^{+\,0.036}_{-\,0.029}$(syst) pb for the 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.