A search for high-mass resonances decaying to ${\tau }^{+}{\tau }^{-}$ in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

Abstract

A search for high-mass resonances decaying into ${\tau }^{+}{\tau }^{-}$ final states using proton-proton collisions at $\sqrt{s}=8$ TeV produced by the Large Hadron Collider is presented. The data were recorded with the ATLAS detector and correspond to an integrated luminosity of 19.5-20.3 fb${}^{-1}$. No statistically significant excess above the Standard Model expectation is observed; 95% credibility upper limits are set on the cross section times branching fraction of $Z^{\prime }$ resonances decaying into ${\tau }^{+}{\tau }^{-}$ pairs as a function of the resonance mass. As a result, $Z^{\prime }$ bosons of the Sequential Standard Model with masses less than 2.02 TeV are excluded at 95% credibility. The impact of the fermionic couplings on the $Z^{\prime }$ acceptance is investigated and limits are also placed on a $Z^{\prime }$ model that exhibits enhanced couplings to third-generation fermions.

26 pages plus author list + cover page (50 pages total), 9 figures, 4 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2014-05/

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