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

Abstract

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$$ \sqrt{s} $$ = 13 TeV, corresponding to an integrated luminosity of 139 fb−1. Leptonic (τ → ℓνℓντ) and hadronic (τ → hadrons ντ) decays of the τ-lepton are considered. All measurements account for the branching ratio of H → ττ and are performed with a requirement |yH| < 2.5, where yH is the true Higgs boson rapidity. The cross-section of the pp → H → ττ process is measured to be 2.94 ±0.21stat−0.32+0.37$$ 0.21{\left(\mathrm{stat}\right)}{-0.32}^{+0.37} $$(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 ±0.41stat−0.67+0.91$$ 0.41{\left(\mathrm{stat}\right)}{-0.67}^{+0.91} $$(syst) pb for gluon-gluon fusion, 0.197 ±0.028stat−0.026+0.032$$ 0.028{\left(\mathrm{stat}\right)}{-0.026}^{+0.032} $$(syst) pb for vector-boson fusion, 0.115 ±0.058stat−0.040+0.042$$ 0.058{\left(\mathrm{stat}\right)}{-0.040}^{+0.042} $$(syst) pb for vector-boson associated production, and 0.033 ±0.031stat−0.017+0.022$$ 0.031{\left(\mathrm{stat}\right)}_{-0.017}^{+0.022} $$(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.