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T: Fachverband Teilchenphysik

T 15: Searches/BSM I

T 15.2: Vortrag

Montag, 16. März 2026, 16:30–16:45, KH 02.018

Search for new phenomena in dilepton final states with associated b-jets at the ATLAS experiment — •Anna Bingham and Frank Ellinghaus — Bergische Universität Wuppertal

An overview of a search for new phenomena in high-mass dilepton (ee,µµ) final states with associated b-jets is presented. The main analysis considers a Z′ model as a candidate explanation for potential anomalies in B hadron decays, where the Z′ boson couples to b and s quarks in the production. Non-resonant contact interactions and t-channel leptoquark production are taken in account as additional interpretations. The search is carried out using the dataset collected by the ATLAS detector in Run-2 of the LHC corresponding to an integrated luminosity of 140 fb⁻¹. Backgrounds are estimated from MC and also by data-driven methods. Control, signal and validation regions are defined, and these regions are fitted in a profile-likelihood fit. Exclusion limits are obtained based on the results of the fit.

Keywords: ATLAS; Search; Dilepton