TL;DR
This paper explores how top quark measurements at the LHC can serve as precise probes for axion-like particles (ALPs), focusing on their interactions with top quarks and resulting phenomenology.
Contribution
It provides a comprehensive analysis of ALP effects on top quark observables and uses LHC run 2 data to constrain ALP parameter space.
Findings
Top quark distributions are sensitive to ALP-top couplings.
LHC data constrains ALP parameter space significantly.
ALP interactions can induce diverse low-energy couplings.
Abstract
Measurements of the top quark by the ATLAS and CMS experiments go beyond testing the Standard Model (SM) with high precision. Axion-like particles (ALPs), a potential SM extension involving new pseudoscalar particles, exhibit strong interactions with heavy SM fermions. Consequently, they can significantly affect the kinematic distributions of top quarks in top-antitop pair production. Moreover, such strong interactions can induce other ALP couplings at low energies, leading to a rich phenomenology. We summarize recent developments in probing the ALP-top coupling and use LHC data from run 2 to constrain the ALP parameter space.
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