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arXiv · 2605.21065

The Single Photon Signature of a Light Long-lived Neutralino at Remote Detectors at the LHC

Herbi K. Dreiner·Julian Günther·Dominik Köhler·Apoorva Shah
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Abstract

We investigate the phenomenology of light long-lived neutralinos in R-parity violating supersymmetric models, focusing on the proposed remote detectors $\texttt{ANUBIS}$, $\texttt{CODEX-b}$, $\texttt{FACET}$, $\texttt{FASER}$, $\texttt{FASER2}$, $\texttt{MAPP}$, $\texttt{MAPP2}$, and $\texttt{MATHUSLA}$ at the LHC. We assume the production of the neutralinos at the ATLAS or CMS interaction points via rare scalar meson decays induced by R-parity violating couplings. We study six supersymmetric R-parity violating benchmark scenarios in which the dominant neutralino decay is $\tilde{\chi}^0_1 \rightarrow \gamma + \nu$. For each scenario, we determine the projected search sensitivity at the above listed detectors. Extending previous work focused primarily on $\texttt{FASER}$ and $\texttt{FASER2}$, we improve the simulation by taking into account the extended flight path of the parent meson. We find that $\texttt{ANUBIS}$ provides the best sensitivity to our benchmark scenarios and $\texttt{FASER}$ the least among the considered experiments, while of course $\texttt{FASER}$ has already taken data.

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Herbi K. Dreiner, Julian Günther, Dominik Köhler, Apoorva Shah. 2026-05-20. The Single Photon Signature of a Light Long-lived Neutralino at Remote Detectors at the LHC. https://arxiv.org/abs/2605.21065

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