R-parity Violation and Light Neutralinos at ANUBIS and MAPP

TL;DR

This paper investigates the detection prospects of very light, long-lived neutralinos in R-parity-violating supersymmetry at the proposed ANUBIS and MAPP experiments, highlighting their potential to outperform existing LHC detectors.

Contribution

It introduces the potential of ANUBIS and MAPP to detect light neutralinos via displaced vertices, comparing their sensitivity with other LHC experiments.

Findings

ANUBIS and MAPP can detect light neutralinos with displaced vertices.

These experiments can outperform or complement existing detectors like ATLAS, CODEX-b, MATHUSLA.

Abstract

In R-parity-violating supersymmetry the lightest neutralino can be very light, even massless. For masses in the range $500$ MeV$\lesssim m_{\tilde\chi^0_1}\lesssim 4.5$ GeV the neutralino can be produced in hadron collisions from rare meson decays via an R-parity violating coupling, and subsequently decay to a lighter meson and a charged lepton. Due to the small neutralino mass and for small R-parity violating coupling the lightest neutralino is long-lived, leading to displaced vertices at fixed-target and collider experiments. In this work, we study such signatures at the proposed experiments ANUBIS and MAPP at the LHC. We also compare their sensitivity reach in these scenarios with that of other present and proposed experiments at the LHC such as ATLAS, CODEX-b, and MATHUSLA. We find that ANUBIS and MAPP can show complementary or superior sensitivity.