Karlsruhe 2024 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 28: Search for new particles 3 (ALPS)
T 28.1: Vortrag
Dienstag, 5. März 2024, 16:00–16:15, Geb. 20.30: 1.067
Search for long-lived axion-like particles in top production — Juliette Alimena1, Freya Blekman1,2, Jeremi Niedziela1, •Lovisa Rygaard1,2, Susanne Westhoff3,5,6, Ruth Shäfer3, and Sebastian Burgisser3,4 — 1Deutsches Elektronen-Synchrotron, Hamburg, Germany — 2Universität Hamburg, Hamburg, Germany — 3Heidelberg University, Heidelberg, Germany — 4Uppsala University, Uppsala, Sweden — 5Radboud University, Nijmegen, The Netherlands — 6Nikhef, Amsterdam, The Netherlands
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.