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

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Abstract Three searches for the direct production of τ-sleptons or charginos and neutralinos in final states with at least two hadronically decaying τ-leptons are presented. For chargino and neutralino production, decays via intermediate τ-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 χ ~ 1 + χ ~ 1 − $$ {\overset{\sim }{\chi}}_1^{+}{\overset{\sim }{\chi}}_1^{-} $$ , chargino masses are excluded up to 970 GeV, while χ ~ 1 ± $$ {\overset{\sim }{\chi}}_1^{\pm } $$ and χ ~ 2 0 $$ {\overset{\sim }{\chi}}_2^0 $$ masses up to 1160 GeV (330 GeV) are excluded for χ ~ 1 ± χ ~ 2 0 / χ ~ 1 + χ ~ 1 − $$ {\overset{\sim }{\chi}}_1^{\pm }{\overset{\sim }{\chi}}_2^0/{\overset{\sim }{\chi}}_1^{+}{\overset{\sim }{\chi}}_1^{-} $$ production with subsequent decays via τ-sleptons (W and h bosons). Masses of τ-sleptons up to 500 GeV are excluded for mass degenerate τ ~ L , R $$ {\overset{\sim }{\tau}}_{L,R} $$ scenarios and up to 425 GeV for τ ~ L $$ {\overset{\sim }{\tau}}_L $$ -only scenarios. Sensitivity to τ ~ R $$ {\overset{\sim }{\tau}}_R $$ -only scenarios from the ATLAS experiment is presented here for the first time, with τ ~ R $$ {\overset{\sim }{\tau}}_R $$ masses excluded up to 350 GeV.