Parapositronium decay into three photons and implications for the neutral pion
High Energy Physics - Phenomenology
2026-02-17 v1
Abstract
We complete the determination of the parapositronium decay into three photons by evaluating amplitudes mediated by the boson. We show that, contrary to the expectation that the extra mass scale may bring an enhancement to the overall scaling, the amplitude turns out to start at order, similarly to the boson mediated amplitude. The decay rate with both and boson contributions is found to be eV, about 47 orders of magnitude smaller than previously estimated. We also discuss its implication for the amplitude.
Cite
@article{arxiv.2602.14899,
title = {Parapositronium decay into three photons and implications for the neutral pion},
author = {Andrzej Czarnecki and Divyesh Dagia and Ting Gao and Ripanjeet Toor},
journal= {arXiv preprint arXiv:2602.14899},
year = {2026}
}