TY - CONF AU - Rygaard, Lovisa AU - Niedziela, Jeremi AU - Schäfer, Ruth AU - Bruggisser, Sebastian AU - Alimena, Juliette AU - Westhoff, Susanne AU - Blekman, Freya TI - Search for long-lived axion-like particles in top production M1 - PUBDB-2024-01551 PY - 2024 AB - We investigate the discovery potential for long-lived axion-like particles produced in association with a top quark-antiquark pair at the (High-Luminosity) LHC. Compared to inclusive searches for a displaced vertex, top quark associated signals offer new trigger options and an extra handle to suppress background. The search strategy includes axion-like particle decays to a displaced di-muon vertex which further contributes to the suppression of prompt background. For axion-like particles with masses above the di-muon threshold, we find that the (High-Luminosity) LHC can probe effective top-quark couplings as small as - ctt - /fa = 0.03 (0.002) TeV and proper decay lengths as long as 20 (300) m, assuming a cross section of 1 fb, with data corresponding to an integrated luminosity of 150 fb−1 (3 ab−1). Our predictions suggest that searches for top quark associated displaced di-muons will explore new terrain in the current sensitivity gap between searches for prompt di-muons and missing energy.In this talk I will present the results of our phenomenology study, and the first results of the CMS analysis searching for this same signature. T2 - DPG Spring Meeting (German Physical Society) CY - 4 Mar 2024 - 8 Mar 2024, Karlsruhe (Germany) Y2 - 4 Mar 2024 - 8 Mar 2024 M2 - Karlsruhe, Germany LB - PUB:(DE-HGF)6 UR - https://bib-pubdb1.desy.de/record/605869 ER -