Parapositronium decay into three photons and implications for the neutral pion
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866914332954066944 |
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| author | Czarnecki, Andrzej Dagia, Divyesh Gao, Ting Toor, Ripanjeet |
| author_facet | Czarnecki, Andrzej Dagia, Divyesh Gao, Ting Toor, Ripanjeet |
| contents | We complete the determination of the parapositronium decay into three photons by evaluating amplitudes mediated by the $Z$ boson. We show that, contrary to the expectation that the extra mass scale $m_e$ may bring an enhancement to the overall scaling, the amplitude turns out to start at $1/m_Z^6$ order, similarly to the $W$ boson mediated amplitude. The decay rate with both $W$ and $Z$ boson contributions is found to be $1.1\cdot 10^{-80}$ eV, about 47 orders of magnitude smaller than previously estimated. We also discuss its implication for the $π^0\to3γ$ amplitude. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_14899 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Parapositronium decay into three photons and implications for the neutral pion Czarnecki, Andrzej Dagia, Divyesh Gao, Ting Toor, Ripanjeet High Energy Physics - Phenomenology We complete the determination of the parapositronium decay into three photons by evaluating amplitudes mediated by the $Z$ boson. We show that, contrary to the expectation that the extra mass scale $m_e$ may bring an enhancement to the overall scaling, the amplitude turns out to start at $1/m_Z^6$ order, similarly to the $W$ boson mediated amplitude. The decay rate with both $W$ and $Z$ boson contributions is found to be $1.1\cdot 10^{-80}$ eV, about 47 orders of magnitude smaller than previously estimated. We also discuss its implication for the $π^0\to3γ$ amplitude. |
| title | Parapositronium decay into three photons and implications for the neutral pion |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2602.14899 |