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T: Fachverband Teilchenphysik

T 101: Searches/BSM VI

T 101.3: Vortrag

Freitag, 20. März 2026, 09:30–09:45, KH 02.018

Probing Dark Matter via the mono-Higgs signature in the τ⁺ τ⁻ final state with the ATLAS detector — •Athul Dev Sudhakar Ponnu and Stan Lai — II. Physikalisches Institut, Georg-August-Universität Göttingen

This analysis searches for physics beyond the Standard Model using the mono-Higgs signature, in which a Higgs boson decaying to a pair of tau leptons (H → τ⁺τ⁻) recoils against significant missing transverse momentum (E_T^miss). This event topology provides a sensitive and direct probe of the dark-matter sector. The results can be interpreted within the framework of the Two Higgs Doublet Model extended by a pseudoscalar mediator (2HDM+a), considering both Type-I and Type-II Yukawa coupling scenarios.

The analysis focuses on the τ_hadτ_had and τ_lepτ_had final states using √s = 13.6 TeV collision data. Monte Carlo samples of tt, single-top, diboson, W/Z+jets, and Higgs processes are used to model the Standard Model backgrounds, while dedicated signal samples spanning multiple mass hypotheses are employed to assess sensitivity to new physics. The early stages of the study, including data-MC agreement checks and multivariate analysis training, are presented in this talk.

Keywords: Dark matter; 2HDM; BSM; ATLAS