Signatures of HyperCharge Axions in Colliders

TL;DR

This paper explores the potential detection of hypercharge axions in collider experiments, discussing their production, decay signatures, existing constraints, and implications for matter-antimatter asymmetry.

Contribution

It introduces the concept of hypercharge axions, analyzes their collider signatures, and assesses current and future experimental constraints on their properties.

Findings

Existing LEP II and Tevatron data constrain hypercharge axion parameters.

Future colliders could significantly improve detection prospects.

Hypercharge axions may play a role in explaining matter-antimatter asymmetry.

Abstract

If in addition to the standard model fields, a new pseudoscalar field that couples to hypercharge topological number density, the hypercharge axion, exists, it can be produced in colliders in association with photons or Z bosons, and detected by looking for its decay into photons or Z's. For a range of masses below a TeV and coupling above a fraction of 1/TeV, existing data from LEP II and the Tevatron can already put interesting constraints, and in future colliders accessible detection range is increased significantly. The hypercharge axion can help in explaining the matter-antimatter asymmetry in the universe.