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Probing Muon $g-2$ at a Future Muon Collider

by Jason Arakawa, Arvind Rajaraman, Taotao Sui, and Tim M.P. Tait

This Submission thread is now published as

Submission summary

Authors (as registered SciPost users): Jason Arakawa · Arvind Rajaraman · Tim Tait
Submission information
Preprint Link: scipost_202307_00016v2  (pdf)
Date accepted: 2024-02-21
Date submitted: 2024-01-22 20:16
Submitted by: Arakawa, Jason
Submitted to: SciPost Physics
Ontological classification
Academic field: Physics
  • High-Energy Physics - Phenomenology
Approach: Phenomenological


The $4.2\sigma$ discrepancy in the $(g-2)$ of the muon provides a hint that may indicate that physics beyond the standard model is at play. A multi-TeV scale muon collider provides a natural testing ground for this physics. In this paper, we discuss the potential to probe the BSM parameter space that is consistent with solving the $(g-2)_{\mu}$ discrepancy in the language of the SMEFT, utilizing the statistical power provided by fitting event rates collected running at multiple energies. Our results indicate the importance of including interference between the BSM and the SM amplitudes, and illustrates how a muon collider running at a handful of lower energies and with less total collected luminosity can better significantly constrain the space of relevant SMEFT coefficients than would be possible for a single high energy run.

Author comments upon resubmission

We thank the referees for the careful review of our manuscript and for providing thoughtful suggestions to improve our work. We have addressed each of the comments either in the manuscript or via a direct reply to the report.

List of changes

Added additional table and description of modeling contamination of the signal by background events.
Added two plots to demonstrate the energy and angular dependence of the event rate.
Added references throughout.
Fixed grammatical errors and typos.

Published as SciPost Phys. 16, 072 (2024)

Reports on this Submission

Anonymous Report 1 on 2024-2-12 (Invited Report)


I appreciate the authors' careful considerations of my suggested edits. These changes are very well implemented and I am happy to recommend the paper for publication.

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