Searching for a Single Photon from Lightest Neutralino Decays in R-parity-violating Supersymmetry at FASER

TL;DR

This paper proposes a search for single photons from neutralino decays in R-parity-violating supersymmetry at FASER, showing potential to surpass current bounds on RPV couplings with future detectors.

Contribution

It introduces a novel search strategy for light neutralino decays producing high-energy photons at FASER and FASER2, extending sensitivity beyond existing limits.

Findings

Potential to improve RPV coupling bounds by orders of magnitude.

Photon energies in the range of 0.1 to 1 TeV.

Feasibility of detecting neutralino decays at FASER detectors.

Abstract

In this work, we propose a search for a single photon at \texttt{FASER} and \texttt{FASER2}, produced from decays of bino-like, sub-GeV lightest neutralinos in the theoretical framework of the R-parity-violating (RPV) Minimal Supersymmetric Standard Model (MSSM). We consider a list of representative benchmark scenarios with one or two non-vanishing RPV couplings. The photon has an energy $\mathcal{O}\left(0.1\right)-\mathcal{O}\left(1\right)$ TeV. We find a sensitivity reach for RPV couplings beyond the current bounds by orders of magnitude at \texttt{FASER} and \texttt{FASER2}.