PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T10 Searches for New Physics
Distinguishing Axion-Like Particles and 2HDM Higgs bosons in $t \bar{t}$ production at the LHC
L. Jeppe*, A. Biekötter, T. Biekötter, A. Grohsjean, S. Heinemeyer, C. Schwanenberger and G.R. Weiglein
Full text: pdf
Pre-published on: January 10, 2024
Published on: March 21, 2024
We present an analysis of the sensitivity
of LHC searches for new spin-0 particles
produced via gluon-fusion and decaying into
top-antitop-quark ($t\bar{t}$) 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 $c_{t}$ and $c_{\tilde{G}}$
based on the existing
CMS search using $35$ fb$^{-1}$ of proton-proton scattering data collected
at $\sqrt{s} = 13$ TeV.
We further investigate posssible distinctions between ALPs and pseudoscalar
Higgs bosons as predicted by the Two Higgs doublet model (2HDM), and
find that a distinction is possible
with data anticipated to be collected
during the high-luminosity phase of the LHC
for a significant range of the effective ALP-gluon coupling.
DOI: https://doi.org/10.22323/1.449.0474
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