Searching for neutrino self-interactions at future muon colliders

TL;DR

This paper explores the potential of future muon colliders to detect neutrino self-interactions, proposing a fixed-target experiment with a forward detector that could significantly improve current sensitivity limits.

Contribution

It introduces a novel experimental setup using muon collider neutrino beams and a forward detector to probe neutrino self-interactions with unprecedented sensitivity.

Findings

Projections can improve existing limits by two orders of magnitude.

The approach surpasses other future experimental sensitivities.

Feasibility of using fixed-target experiments at muon colliders is demonstrated.

Abstract

Multi-TeV muon colliders offer a powerful means of accessing new physics coupled to muons while generating clean and intense high-energy neutrino beams via muon decays. We study a fixed-target experiment leveraging the neutrino beams and a forward detector pointing at the interaction point of the muon collider. The sensitivity to neutrino self-interactions is analyzed as a feasibility study, focusing on the leptonic scalar $\phi$ exclusively coupled to the Standard Model neutrinos. Our work shows that projections from both the main and forward detectors can enhance the existing limits by two orders of magnitude, surpassing other future experiments.