Search for electroweak production of supersymmetric particles in final states with two $\tau$-leptons in $\sqrt{s}$ = 13 TeV $pp$ collisions with the ATLAS detector

Abstract

Three searches for the direct production of $\tau$-sleptons or charginos and neutralinos in final states with at least two hadronically decaying $\tau$-leptons are presented. For chargino and neutralino production, decays via intermediate $\tau$-sleptons or $W$ and $h$ bosons are considered. The analysis uses a dataset of $pp$ collisions corresponding to an integrated luminosity of $139$fb${}^{-1}$, recorded with the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of 13 TeV. No significant deviation from the expected Standard Model background is observed and supersymmetric particle mass limits at 95% confidence level are obtained in simplified models. For direct production of $\stackrel{~}{}{\chi }_1^{+}\stackrel{~}{}{\chi }_1^{-}$, chargino masses are excluded up to 970 GeV, while $\stackrel{~}{}{\chi }_1^{\pm }$ and $\stackrel{~}{}{\chi }_2^0$ masses up to 1160 GeV (330 GeV) are excluded for $\stackrel{~}{}{\chi }_1^{\pm }\stackrel{~}{}{\chi }_2^0$/$\stackrel{~}{}{\chi }_1^{+}\stackrel{~}{}{\chi }_1^{-}$ production with subsequent decays via $\tau$-sleptons ($W$ and $h$ bosons). Masses of $\tau$-sleptons up to 500 GeV are excluded for mass degenerate $\stackrel{~}{}{\tau }_{L,R}$ scenarios and up to 425 GeV for $\stackrel{~}{}{\tau }_L$-only scenarios. Sensitivity to $\stackrel{~}{}{\tau }_R$-only scenarios from the ATLAS experiment is presented here for the first time, with $\stackrel{~}{}{\tau }_R$ masses excluded up to 350 GeV.

arXiv comment62 pages in total, author list starting page 45, 16 figures, 12 tables, published as JHEP 05 (2024) 150. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2023-03

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