ATLAS H→μμ search with the ATLAS experiment

by Eleonora Rossi (University of Oxford (GB))

Wednesday 29 Oct 2025, 13:30 → 14:30 Europe/London

Small Lecture Theatre (Poynting)

A search for the dimuon decay of the Higgs boson is presented based on pp collision data recorded by ATLAS during Run 3 of the Large Hadron Collider, corresponding to an integrated luminosity of 165 fb−1. To enhance the sensitivity, the results are combined with those from Run 2. An excess of events over the background is observed with a significance of 3.4σ (2.5 σ expected). The best-fit signal strength is μ=1.4±0.4. This result provides evidence for the H→μμ decay with ATLAS data and offers a direct probe of the Higgs-boson Yukawa coupling to second-generation fermions.