Abstract
We study a bino-like light neutralino (\( {\overset{\sim }{\chi}}_1^0 \)) produced at the LHC from the decay of a scalar lepton (\( \tilde{e}_L \)) through the process pp → \( \tilde{e}_L \) → \( e{\overset{\sim }{\chi}}_1^0 \) in the context of R-parity-violating (RPV) supersymmetry where \( {\overset{\sim }{\chi}}_1^0 \) is the lightest supersymmetric particle. For small masses and RPV couplings, the neutralino is naturally long-lived and its decay products can be identified as displaced tracks. Following existing searches, we propose a displaced-vertex search strategy for such a light neutralino with a single RPV coupling switched on, \( {\lambda}_{111}^{\prime } \), in the mass range 10 GeV ≲ \( {m}_{{\overset{\sim }{\chi}}_1^0} \) ≲ 230 GeV. We perform Monte Carlo simulations and conclude that at the high-luminosity LHC, the proposed search can probe values of \( {\lambda}_{111}^{\prime } \) down to two orders of magnitude smaller than current bounds and up to 40 times smaller than projected limits from monolepton searches.
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12 June 2024
An Erratum to this paper has been published: https://doi.org/10.1007/JHEP06(2024)069
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Cottin, G., Helo, J.C., Neill, N.A. et al. Searching for light neutralinos with a displaced vertex at the LHC. J. High Energ. Phys. 2022, 95 (2022). https://doi.org/10.1007/JHEP10(2022)095
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DOI: https://doi.org/10.1007/JHEP10(2022)095