Some O(α 2) annihilation type contributions to the orthopositronium width
Abstract
We consider some radiative corrections to the lowest order annihilation diagram for the orthopositronium decay rate. The insertion of the renormalized vertex correction in the annihilation graph gives 1.6278 (α/π)^2 Γ_0. We compute also the contribution of the square of the lowest order annihilation amplitude, which turns out to be 0.1702 (α/π)^2 Γ_0. Finally, we obtain a term α^2 lnα Γ_0 arising from the correction to the light light scattering block due to the exchange of one coulombic photon, in agreement with earlier computations.
- Publication:
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European Physical Journal C
- Pub Date:
- September 1998
- DOI:
- 10.1007/s100529800864
- arXiv:
- arXiv:hep-ph/9706523
- Bibcode:
- 1998EPJC....5..535A
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- Extended version including a computation in the Coulomb gauge. 22 pages, latex, 2 figures