Majorana neutrino dipole moments and masses at a muon collider

TL;DR

A future 30 TeV muon collider could significantly advance the study of Majorana neutrinos by directly probing their dipole moments and mass matrix entries, offering unique insights into lepton number violation.

Contribution

This paper demonstrates the potential of a high-energy muon collider to directly measure Majorana neutrino properties with unprecedented sensitivity.

Findings

Collider sensitivity to neutrino dipole moments of ~10^{-12} μ_B

Potential to establish the Majorana nature of neutrinos

Order-of-magnitude improvements in bounds on neutrino mass matrix entries

Abstract

A future multi-TeV muon collider would provide an important probe for Majorana neutrinos. A muon collider with a collision energy of $\sim$30 TeV would be sensitive to $\nu_e-\nu_\mu$ transition dipole moments of the order of $\sim 10^{-12}\mu_B$ and would be thus competitive with the latest astrophysical observation and laboratory experiments. Contrary to the latter, the muon collider would have the unique advantage of a direct and clean identification of lepton number and flavour violation. This would establish the Majorana nature of the neutrino and would provide crucial complementary information on the neutrino properties in the event of a (near) future observation at low-energy experiments. Additionally, a muon collider would improve by orders of magnitude the direct bounds on the Majorana neutrino mass matrix entries $m_{e\mu}$ and $m_{\mu\mu}$.