Decays of a bino-like particle in the low-mass regime

TL;DR

This paper investigates the decay properties of a light bino-like neutralino within R-parity violating supersymmetry, emphasizing its potential detectability in far-detector experiments and providing a model-independent analysis of its interactions.

Contribution

It offers a systematic, model-independent framework for analyzing decays of light bino-like particles, applicable across various UV-completions and effective theories.

Findings

Decay channels and lifetimes of the bino-like neutralino are characterized.

Potential signals in far-detector experiments like FASER are identified.

Connections to phenomena such as neutron-antineutron oscillations are discussed.

Abstract

We study the phenomenology associated with a light bino-like neutralino with mass under the tau mass in the context of the R-parity violating Minimal Supersymmetric Standard Model. This is a well-motivated example of scenarios producing potentially light and long-lived exotic particles, which might be testable in far-detector experiments, such as the FASER experiment at the Large Hadron Collider. A quantitative assessment of the discovery potential or the extraction of limits run through a detailed understanding of the interactions of the light exotic fermion with Standard Model matter, in particular, the hadronic sector. Here, we propose a systematic analysis of the decays of such a particle and proceed to a model-independent derivation of the low-energy effects, so that this formalism may be transposed to other UV-completions or even stand as an independent effective field theory. We then stress the diversity of the possible phenomenology and more specifically discuss the features associated with the R-parity violating supersymmetric framework, for example neutron-antineutron oscillations.