Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 101: BSM Higgs 4

T 101.4: Talk

Thursday, March 7, 2024, 16:45–17:00, Geb. 30.41: HS 3

Search for long-lived axion-like particles produced in Higgs boson decays at the ATLAS Experiment — •Lukas Bauckhage — Physikalisches Institut, Universität Bonn, Bonn; Germany

Preliminary results of a search for long-lived axion-like particles produced in a Higgs decay in association with a Z boson and decaying into a pair of photons are presented. Exotic Higgs decays to long-lived particles are featured in theories beyond the standard model related to hidden sectors, while (long-lived) axion-like particles are not only a prime candidate to dark matter but also part of hidden and dark sector theories. This analysis uses Run 2 and 3 data collected with the ATLAS detector and follows a previous search for promptly decaying axion-like particles. The ALP decay's displacement challenge the standard photon reconstruction and call for new techniques, such as machine learning and a new tagger utilising shower shape information. Detailed studies of the ALP identification and reconstruction efficiency as a function of its radial and longitudinal displacement will be discussed.

Keywords: long-lived; axion-like; axion; ALP