2024 Articles

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

Aad, G.; Abbott, B.; Abeling, K.; Abicht, N. J.; Abidi, S. H.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Acharya, B. S.; Adam Bourdarios, C.; Adamczyk, L.; Adamek, L.; Addepalli, S. V.; Addison, M. J.; Adelman, J.; Adiguzel, A.; Adye, T.; Affolder, A. A.; Afik, Y.; Agaras, M. N.; Agarwala, J.; Aggarwal, A.; Agheorghiesei, C.; Ahmad, A.; Ahmadov, F.; Ahmed, W. S.; Ahuja, S.; Ai, X.; Aielli, G.; Aikot, A.; Ait Tamlihat, M.; Aitbenchikh, B.; Aizenberg, I.; Akbiyik, M.; Åkesson, T. P. A.; Akimov, A. V.; Akiyama, D.; Akolkar, N. N.; Al Khoury, Konie

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 χ̃₁⁺χ̃₁⁻, chargino masses are excluded up to 970 GeV, while χ̃₁^± and χ̃₂⁰ masses up to 1160 GeV (330 GeV) are excluded for χ̃₁^±χ̃₂⁰/χ̃₁⁺χ̃₁⁻ 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 ̃_𝐿𝑅 scenarios and up to 425 GeV for 𝜏̃_𝐿-only scenarios. Sensitivity to 𝜏̃_𝑅-only scenarios from the ATLAS experiment is presented here for the first time, with 𝜏̃_𝑅 masses excluded up to 350 GeV.