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Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 101: BSM Higgs 4

T 101.3: Talk

Thursday, March 7, 2024, 16:30–16:45, Geb. 30.41: HS 3

Distinguishing Axion-Like Particles from Extended Higgs Sector Models in tt production at the LHCAnke Biekötter1, Thomas Biekötter2, Alexander Grohsjean3, Sven Heinemeyer4, •Laurids Jeppe5, Christian Schwanenberger5,3, and Georg Weiglein5,31PRISMA+ Cluster of Excellence & Institute of Physics (THEP) & Mainz Institute for Theoretical Physics, Johannes Gutenberg University, Mainz, Germany — 2Institute for Theoretical Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany — 3Universität Hamburg, Hamburg, Germany — 4Instituto de Física Teórica UAM-CSIC, Madrid, Spain — 5Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany

We present an analysis of the sensitivity of LHC searches for new spin-0 particles produced via gluon-fusion and decaying into top quark-antiquark (tt) final states to generic axion-like particles (ALPs) coupled to top-quarks and gluons. We derive new limits on the effective ALP Lagrangian in the linear representation in terms of the Wilson coefficients ct and cG based on the existing CMS search using 35 fb−1 collected at √s = 13 TeV. We further investigate posssible distinctions between ALPs and pseudoscalar Higgs bosons as predicted by the two-Higgs-doublet model (2HDM), and find that distinction is possible with data anticipated to be collected during the high-luminosity of the LHC for a significant range of the effective ALP-gluon coupling.

Keywords: BSM; ALP; Heavy Higgs; 2HDM; Top

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