ALPs EFT & Collider Signatures

TL;DR

This paper investigates effective interactions between the Standard Model and a singlet CP-odd Goldstone boson within linear and non-linear electroweak symmetry breaking frameworks, analyzing collider signatures and new bounds.

Contribution

It determines the basis of leading effective operators for non-linear realizations and explores collider signals and bounds for these interactions.

Findings

Mono-Z, mono-W, and aWγ signals are expected in both frameworks.

Non-standard Higgs decays and mono-H signals may indicate non-linear EWSB.

New bounds on effective interactions are established.

Abstract

We explore the leading effective interactions between the Standard Model and a generic singlet CP-odd (pseudo)Goldstone boson in two frameworks for electroweak symmetry breaking: linear and non-linear realizations, determining the basis of leading effective operators for the latter. New bounds are obtained and prospects of signals at colliders are explored. Mono-Z, mono-W, and aW{\gamma} are signals expected in both frameworks while non-standard Higgs decays and mono-h signals may point to non-linear EWSB realizations.