Signatures of HyperCharge Axions at Contemporary and Future Colliders

TL;DR

This paper explores the potential to detect Hypercharge Axions at current and future colliders, analyzing their production and decay channels, and assessing existing constraints and future detection prospects.

Contribution

It introduces the concept of Hypercharge Axions in collider physics and evaluates their detectability, providing new insights into their potential signatures and constraints.

Findings

Current LHC data constrains certain HCA parameter space.

Future colliders like HL-LHC can significantly improve detection prospects.

HCA decay into photons or Z bosons offers observable signatures.

Abstract

We investigate the possible detection of the Hypercharge Axion (HCA) in colliders. The HCA is a hypothetical pseudoscalar that couples to weak hypercharge topological density and could potentially explain the dominance of matter over antimatter in the observable universe. If the HCA exists, it can be produced in colliders via vector boson fusion or in association with a photon or with a Z boson, and detected by looking for its decay into photons or Z bosons. We find that for certain values of the HCA mass and coupling scales, both of the order of a TeV, existing data from the Large Hadron Collider (LHC) can already put interesting constraints and in future colliders, such as the High Luminosity LHC, the accessible detection range is increased significantly.