Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mo>→</mml:mo><mml:mi>τ</mml:mi><mml:mi>τ</mml:mi></mml:math>cross section with the ATLAS detector

The $Z\ensuremath{\rightarrow}\ensuremath{\tau}\ensuremath{\tau}$ cross section is measured with the ATLAS experiment at the LHC in four different final states determined by the decay modes of the $\ensuremath{\tau}$ leptons: muon-hadron, electron-hadron, electron-muon, and muon-muon. The analysis is based on a data sample corresponding to an integrated luminosity of $36\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$, at a proton-proton center-of-mass energy of $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$. Cross sections are measured separately for each final state in fiducial regions of high detector acceptance, as well as in the full phase space, over the mass region 66--116 GeV. The individual cross sections are combined and the product of the total $Z$ production cross section and $Z\ensuremath{\rightarrow}\ensuremath{\tau}\ensuremath{\tau}$ branching fraction is measured to be $0.97\ifmmode\pm\else\textpm\fi{}0.07(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.06(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.03(\mathrm{lumi})\text{ }\text{ }\mathrm{nb}$, in agreement with next-to-next-to-leading order calculations.

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