Parapositronium can decay into three photons

Abstract

We calculate the decay rate and spectrum for the decay of parapositronium into three photons. This process violates charge conjugation symmetry. It is forbidden within quantum electrodynamics but proceeds through the weak interaction. The branching ratio we find is fifty orders of magnitude smaller than the previous estimate.

Accpted to PRD

Cited by in corpus (2)

• QED and Fundamental Symmetries in Positronium Decays
• Towards Time Reversal Symmetry Test with o-Ps Decays using the J-PET detector