Searches for new physics at SND@LHC

Abstract

SND@LHC is an approved experiment equipped to detect scatterings of neutrinos produced in the far-forward direction at the LHC, and aimed to measure their properties. In addition, the detector has a potential to search for new feebly interacting particles (FIPs) that may be produced in proton-proton collisions. In this paper, we discuss signatures of new physics at SND@LHC for two classes of particles: stable FIPs that may be detected via their scattering, and unstable FIPs that decay inside the detector. We estimate the sensitivity of SND@LHC to probe scatterings of leptophobic dark matter and decays of neutrino, scalar, and vector portal particles. Finally, we also compare and qualitatively analyze the potential of SND@LHC and FASER/FASERν experiments for these searches.

The Present and Future Status of Heavy Neutral Leptons

“…Fig. 16 [411] shows what was previously reported in the literature. It can be seen that during Run 3 SND@LHC can explore a new parameter space region if HNLs mix exclusively with ν τ .…”

Feebly-interacting particles: FIPs 2020 workshop report

“…A first study of sensitivities has been performed in Ref. [1280]. While this study is theoretical, and several experimental assumptions need to be checked, it gives us a first idea of SND@LHC's capabilities for feebly interacting particle searches.…”

A Snowmass Whitepaper: Dark Matter Production at Intensity-Frontier Experiments

“…In Figs 6b and 6c we present the projected exclusion bounds for the search for hadrophilic DM scattering signatures in the CCM200 [26,50], FLArE [51], PIP2 BD [52], and SND@LHC [53] experiments, as well as the relevant future bounds from missing energy/momentum searches at NA64 [22,54] and LDMX-II [55]. These have been obtained for the U (1) B−3 Lτ (left panel) and U (1) B (right) gauge boson V coupled to the DM particles with α D = 0.5.…”