Abstract
The $LQ\bar D$ operator in R-parity-violating supersymmetry can lead to meson decays to light neutralinos and neutralino decays to lighter mesons, with a long lifetime. Since the high-luminosity LHC is expected to accumulate as much as 3/ab of data, several detectors proposed to be built at the LHC may probe unexplored regions in the parameter space, for long-lived neutralinos. We estimate the sensitivity of the recently proposed detectors, CODEX-b, FASER, and MATHUSLA, for detecting such light neutralinos singly produced from $D$- and $B$-meson decays in a list of benchmark scenarios, and discuss the advantages and disadvantages of the proposed detectors in this context. We also present our results in a model independent fashion, which can be applied to any long-lived particle with mass in the GeV regime.
Highlights
The discovery of a standard-model (SM)-like Higgs boson in 2012 has been a highlight of the Large HadronCollider (LHC) [1,2]
As a follow-up work to Ref. [31], we choose to focus only on one key benchmark scenario which features the important characteristics for a comparison of the proposed Large HadronCollider (LHC)(b) detectors’ sensitivities, while only briefly discussing the other
We have investigated the sensitivity of three recently proposed detectors at the LHC: CODEX-b, FASER, and MATHUSLA with respect to the detection of light long-lived neutralinos in RPV-SUSY scenarios
Summary
The discovery of a standard-model (SM)-like Higgs boson in 2012 has been a highlight of the Large Hadron. The RPV couplings can induce single production of neutralinos via rare meson decays Such scenarios have been investigated in various fixed-target setups [13,26,27,28]. The mass differences between the mesons, the neutralino, and a potential tau-lepton strongly affect the search sensitivities It is the purpose of this paper to investigate the discovery potential of light neutralinos at the detectors CODEX-b, FASER, and MATHUSLA. This is an allowed supersymmetric parameter range, and should be investigated Such a light neutralino is only consistent with the observed dark matter density if it decays on timescales much shorter than the age of the Universe. This is the case for R-parity-violating scenarios. Note that results for significantly nondegenerate SUSY spectra may differ significantly and can change the relative importance of bounds from different sources
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