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A measurement of production cross sections of the Higgs boson inproton-proton collisions is presented in the $H\rightarrow\tau\tau$ decaychannel. The analysis is performed using $36.1\mathrm{fb}^{-1}$ of datarecorded by the ATLAS experiment at the Large Hadron Collider at acenter-of-mass energy of $\sqrt{s}=13$ TeV. All combinations of leptonic ($\tau\rightarrow l \nu \bar{\nu}$ with $l = e$, $\mu$) and hadronic ($\tau \to\mathrm{hadrons} \nu$) tau decays are considered. The $H\rightarrow\tau\tau$signal over the expected background from other Standard Model processes isestablished with an observed (expected) significance of 4.4 (4.1) standarddeviations. Combined with results obtained using data taken at 7 and 8 TeVcenter-of-mass energies, the observed (expected) significance amounts to 6.4(5.4) standard deviations and constitutes an observation of$H\rightarrow\tau\tau$ decays. Using the data taken at $\sqrt{s}=13$ TeV, thetotal cross section in the $H\rightarrow\tau\tau$ decay channel is measured tobe$3.77^{+0.60}_{-0.59}\mathrm{(stat.)}^{+0.87}_{-0.74}\mathrm{(syst.)}\mathrm{pb}$,for a Higgs boson of mass 125 GeV assuming the relative contributions of itsproduction modes as predicted by the Standard Model. Total cross sections inthe $H\rightarrow\tau\tau$ decay channel are determined separately forvector-boson-fusion production and gluon-gluon-fusion production to be $0.28\pm 0.09\mathrm{(stat.)}^{+0.11}_{-0.09}\mathrm{(syst.)}\mathrm{pb}$ and $3.1\pm 1.0\mathrm{(stat.)}^{+1.6}_{-1.3}\mathrm{(syst.)}\mathrm{pb}$,respectively. Similarly, results of a fit are reported in the framework ofsimplified template cross sections. All measurements are in agreement withStandard Model expectations.

physical review. d/physical review. d.

Cross-section measurements of the Higgs boson decaying into a pair of  tau-leptons in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS  detector