PT Journal
AU Esser, F
   Madigan, M
   Sanz, V
   Ubiali, M
TI On the coupling of axion-like particles to the top quark
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2023
BP 063
EP 39pp
VL 09
IS 9
DI 10.1007/JHEP09(2023)063
AB In this paper we explore the coupling of a light axion-like particle (ALP) to top quarks. We use high-energy LHC probes, and examine both the direct probe to this coupling in associated production of a top-pair with an ALP, and the indirect probe through loop-induced gluon fusion to an ALP leading to top pairs. Using the latest LHC Run II data, we provide the best limit on this coupling. We also compare these limits with those obtained from loop-induced couplings in diboson final states, finding that the +MET channel is the best current handle on this coupling.
ER