Göttingen 2025 – scientific programme
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T: Fachverband Teilchenphysik
T 44: Searches/BSM III (Long-lived, Misc.)
T 44.3: Talk
Wednesday, April 2, 2025, 16:45–17:00, ZHG010
Search for long-lived axion-like particles produced in Higgs boson decays at the ATLAS Experiment — •Lukas Bauckhage1,2 and Federico Meloni1 — 1Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 2Physikalisches Institut, Universität Bonn, Bonn, Germany
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. Preliminary results of an ATLAS Run 3 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. The ALP decay's displacement challenges the standard photon reconstruction and calls for new techniques, such as machine learning and a new tagger utilising shower shape information. Detailed studies of the performance of these algorithms will be presented.
Keywords: long-lived; ALP; axion-like; Higgs