Recasting Bounds on Long-lived Heavy Neutral Leptons in Terms of a Light Supersymmetric R-parity Violating Neutralino
arxiv(2023)
摘要
In R-parity-violating (RPV) supersymmetric models, light neutralinos with
masses from the GeV-scale down to even zero are still allowed by all laboratory
constraints. They are further consistent with dark matter observations, as they
decay via RPV couplings. These RPV couplings are in general constrained to be
small. Hence, such light neutralinos, if produced, e.g., at a beam-dump or
collider experiment, appear as displaced vertices or missing energy at the
detector level. The same signatures have been extensively searched for at
various experiments in the theoretical context of sterile neutrinos which mix
with active neutrinos. In this work, we recast the sensitivity of both past and
present experiments to sterile neutrinos to obtain new bounds on RPV couplings
associated with a light neutralino. We find experiments such as T2K, BEBC,
FASER, DUNE, and MoEDAL-MAPP can improve the current bounds on RPV couplings by
up to 3-4 orders of magnitude in several benchmark scenarios.
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