Abstract
Long-lived light particles (LLLPs) appear in many extensions of the standard model. LLLPs are usually motivated by the observed small neutrino masses, by dark matter or both. Typical examples for fermionic LLLPs (a.k.a. heavy neutral fermions, HNFs) are sterile neutrinos or the lightest neutralino in R-parity violating supersymmetry. The high luminosity LHC is expected to deliver up to 3/ab of data. Searches for LLLPs in dedicated experiments at the LHC could then probe the parameter space of LLLP models with unprecedented sensitivity. Here, we compare the prospects of several recent experimental proposals, FASER, CODEX-b and MATHUSLA, to search for HNFs and discuss their relative merits.s
Highlights
Comparing the results shown in figure 2 with those of figure 1 one sees that CODEX-b does better than even FASERR for both, W and Z-bosons
We have discussed the sensitivities for three recent experimental proposals, MATHUSLA [6], CODEX-b [7] and FASER [8] for the case of fermionic light long-lived particles
We considered two concrete example models for our study: (a) light sterile neutrinos and (b) the lightest neutralino in R-parity violating supersymmetry
Summary
We give a short summary of the two models for heavy neutral fermions that we study numerically in this paper. We first discuss sterile neutrinos and give some basic definitions and features for the neutralino in R-parity violating supersymmetry. Since both models have been discussed in the literature many times, we will be very brief
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