Abstract
FASERν is a newly proposed detector whose main mission is to detect the neutrino flux from the collision of the proton beams at the ATLAS Interaction Point (IP) during the run III of the LHC in 2022–2024. We show that this detector can also test certain beyond standard model scenarios, especially the ones in which the neutrino interaction with matter fields can produce new unstable particles decaying back into charged leptons. Models of this kind are motivated by the MiniBooNE anomaly. We show that, if the new physics involves multi-muon production by neutrinos scattering off matter fields, including the neutrino flux interactions in the rock before the detector in the analysis (i.e., accounting for the through-going muon pairs) can significantly increase the effective detector mass and its sensitivity to new physics. We propose a concrete model that can give rise to such a multi-muon signal.
Highlights
Let us study the number of events at FASERν and discuss what bounds can be derived from this experiment
We have studied the discovery potential of FASERν for beyond standard model interaction of neutrinos with nuclei that leads to a multilepton signature
We have found that the FASERν detector can record between few 104 to 1 events as mZ varies between 10 MeV to 1 GeV
Summary
After reviewing backgrounds for multimuon events and suggesting strategies for reducing them, we discuss under what conditions the through-going multi-muon events can be invoked to discover new physics. If FASERν records two muon pair events within 1 ns, we can make sure that they originate from new physics even if we do not reconstruct the directions of the muons. For such signal events, the effective mass of the detector will be enhanced by including the events originating in the rock before the detector. In the appendix, we shall develop a model in which one or two pairs of forward going muons are produced by the interaction of the neutrino flux in the rock and concrete before the detector. We demonstrate how invoking the through-going muon pairs will increase the sensitivity of FASERν to search for new physics
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
