New Physics at the Muon (Synchrotron) Ion Collider: MuSIC for several scales

TL;DR

The MuSIC collider, a proposed muon-ion collider, offers a versatile platform for nuclear physics, Standard Model tests, and unprecedented searches for New Physics beyond current experimental limits across a wide energy spectrum.

Contribution

This work demonstrates MuSIC's potential to surpass current limits and explore new regimes in Beyond the Standard Model physics, including lepton-flavor violation and sterile neutrinos.

Findings

MuSIC can probe lepton-flavor violating leptoquarks.

It can explore muonphilic vector boson interactions.

It has sensitivity to axion-like particles and sterile neutrinos.

Abstract

A Muon (Synchrotron) Ion Collider (MuSIC) can be the successor to the Electron-Ion Collider at Brookhaven National Laboratory, as well as the ideal demonstrator facility for a future multi-TeV Muon Collider. Besides its rich nuclear physics and Standard Model particle physics programs, in this work we show that the MuSIC with a TeV-scale muon beam offers also a unique opportunity to probe New Physics. In particular, the relevant searches have the potential to surpass current experimental limits and explore new regimes of the parameter space for a variety of Beyond the Standard Model scenarios including: lepton-flavor violating leptoquarks, muonphilic vector boson interactions, axion-like particles coupling to photons, and heavy sterile neutrinos. Depending on the particular case, the sensitivity of the searches in the MuSIC may span a wide range of energy scales, namely from sub-GeV particles to the few TeV New Physics mediators. Our analysis demonstrates that the MuSIC can strike a powerful chord in the search for New Physics, thanks to unique combination of features that amplify its capabilities.