Searching for light neutralinos with a displaced vertex at the LHC

Abstract

We study a bino-like light neutralino (${\tilde{\chi }}_1^0$) produced at the LHC from the decay of a scalar lepton (${\tilde{e}}_L$) through the process $pp\to {\tilde{e}}_L\to e{\tilde{\chi }}_1^0$ in the context of R-parity-violating (RPV) supersymmetry where ${\tilde{\chi }}_1^0$ 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 $10\,\mbox{GeV} \lesssim m_{\tilde χ_1^0}\lesssim 230\,\mbox{GeV}$. 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 stronger than projected limits from monolepton searches.

16 pages, 6 figures; v2: comment added, matches version to be published in JHEP; v3: figure 2 corrected

References in corpus (7)

• An Introduction to PYTHIA 8.2
• Can neutralinos in the MSSM and NMSSM scenarios still be light?
• Hunting the lightest lightest neutralinos
• Long-lived light neutralinos at Belle II
• Revisiting the LHC reach in the displaced region of the minimal left-right symmetric model
• Searching for light long-lived neutralinos at Super-Kamiokande
• Neutrinoless Double Beta Decay via Light Neutralinos in R-Parity Violating Supersymmetry

Cited by in corpus (3)

• Long-lived neutral fermions at the DUNE near detector
• Searching for long-lived light neutralinos and axionlike particles at the SHiNESS experiment
• Dark Acoustic Oscillations as an Early-Universe Explanation of the DESI Anomaly