Positronium Decay into a Photon and Neutrinos

Abstract

We determine the rates and energy and angular distributions of the positronium decays into a photon and a neutrino-antineutrino pair, Ps-->gamma+nu+anti-nu. We find that both positronium spin states have access to this decay channel, contrary to a previously published result. The low-energy tails of the spectra are shown to be sensitive to the binding effects and agree with Low's theorem. Additionally, we find a connection between the behaviour of the soft photon spectrum in both o-Ps-->gamma+nu+anti-nu and o-Ps-->3gamma decays, and the Stark effect.

arXiv commentSubmitted to Physical Review D

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Cited by in corpus (5)

• QED and Fundamental Symmetries in Positronium Decays
• Searching for Elusive Dark Sectors with Terrestrial and Celestial Observations
• Parapositronium can decay into three photons
• First search for invisible decays of ortho-positronium confined in a vacuum cavity
• Circular polarisation: a new probe of dark matter and neutrinos in the sky