Unique Probe of Neutrino Electromagnetic Moments with Radiative Pair Emission

Abstract

The neutrino magnetic and electric moments are zero at tree level but can arise in radiative corrections. Any deviation from the Standard Model prediction would provide another indication of neutrino-related new physics in addition to the neutrino oscillation and masses. Especially, Dirac and Majorana neutrinos have quite different structures in their electromagnetic moments. Nevertheless, the recoil measurements and astrophysical stellar cooling can only constrain combinations of neutrino magnetic and electric moments with the limitation of not seeing their detailed structures. We propose using the atomic radiative emission of neutrino pair to serve as a unique probe of the neutrino electromagnetic moments with the advantage of not just separating the magnetic and electric moments but also identifying their individual elements. Both searching strategy and projected sensitivities are explored in this letter.

Overview of neutrino electromagnetic properties

“…Just very recently a novel way to probe the neutrino magnetic and electric moments by using the atomic radiative emission of neutrino pair has been discussed in [19]. It is claimed that the sensitivity for the neutrino magnetic moment at the level (1.5 ∼ 3.5) × 10 −11 𝜇 𝐵 is reachable.…”