# R-axion at colliders

## TL;DR

This paper investigates the properties and collider signatures of the R-axion, a pseudo-Goldstone boson arising from R-symmetry breaking in hidden sectors with supersymmetry, providing new constraints and experimental prospects.

## Contribution

It derives model-independent bounds on the R-axion decay constant across a wide mass range and highlights its potential as the first observable sign of supersymmetry at colliders.

## Key findings

- New bounds on R-axion decay constant from GeV to TeV masses.
- Identification of distinctive collider signals of the R-axion.
- Motivation for dedicated searches for axion-like particles at various colliders.

## Abstract

We study the effective theory of a generic class of hidden sectors where supersymmetry is broken together with an approximate R-symmetry at low energy. The light spectrum contains the gravitino and the pseudo-Nambu-Goldstone boson of the R-symmetry, the R-axion. We derive new model-independent constraints on the R-axion decay constant for R-axion masses ranging from GeV to TeV, which are of relevance for hadron colliders, lepton colliders and B-factories. The current bounds allow for the exciting possibility that the first sign of SUSY will be the R-axion. We point out its most distinctive signals, providing a new experimental handle on the properties of the hidden sector and a solid motivation for searches of axion-like particles.