# New Probes for Axion-like Particles at Hadron Colliders

## TL;DR

This paper explores new methods to detect axion-like particles at the LHC through associated production channels and their effects on top quark dipole moments, providing bounds on ALP couplings.

## Contribution

It introduces novel collider channels and precision measurements to constrain ALP parameters, including realistic simulations for future collider sensitivities.

## Key findings

- ALP production with a photon and jet is highly sensitive to ALP-gauge boson couplings.
- Top quark dipole moments can probe ALP interactions with top quarks and gauge bosons.
- Constraints are complementary to direct searches, especially for light ALPs.

## Abstract

Axion-like particles (ALPs) appear from spontaneous global symmetry breaking in many extensions of the Standard Model (SM). In this paper, we find bounds on ALP ($a$) model parameters at the LHC from the ALP production associated with a photon and a jet ($j+\gamma+a$) as well as single top and top quark pairs ($t+j+a$, $t\bar{t}+a$) in a model independent approach. In particular, it is shown that the ALP production associated with a photon plus a jet at the LHC is a promising channel with significant sensitivity to probe the ALP couplings to gluons and electroweak gauge bosons. The prospects are presented at the High Luminosity LHC including a realistic detector simulation and pile up effects. Furthermore, the ALP model is examined through its contributions to the top quark (chromo)magnetic dipole moments. It is shown that the top quark magnetic and chromomagnetic dipole moments enable us to probe the ALP couplings to top quark and gauge bosons at a time. The constraints are complementary to those obtained from direct searches, as they are sensitive to light ALPs.