We present an in-depth analysis of axions and axion-like particles in top-pair production at the LHC. Our main goal is to probe the axion coupling to top quarks at high energies. To this end, we calculate the top-antitop cross section and differential distributions including ALP effects up to one-loop level. By comparing these predictions with LHC precision measurements, we constrain the top coupling of axion-like particles with masses below the top-antitop threshold. Our results apply to all UV completions of the ALP effective theory with dominant couplings to top quarks, in particular to DFSZ-like axion models.
@article{arxiv.2312.00872,
title = {Precise tests of the axion coupling to tops},
author = {Anh Vu Phan and Susanne Westhoff},
journal= {arXiv preprint arXiv:2312.00872},
year = {2024}
}