Order m alpha^8 Contributions to the Decay Rate of Orthopositronium

Details Order m alpha^8 Contributions to the Decay Rate of Orthopositronium Order m alpha^8 Contributions to the Decay Rate of Orthopositronium

1993-10-01

arxiv.org/abs/hep-ph/9310208v1

Phys.Rev.Lett. 72 (1994) 2006-2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

LATeX file, 7 pages

Scientific paper

10.1103/PhysRevLett.72.2006

We discuss how contributions to the order ${\cal O} (m \alpha^8)$ orthopositronium decay rate can be separated into two categories, one due to relativistic momenta and calculable in terms of QED scattering amplitudes, the other due to low momenta and calculable in the simpler framework of a low-energy effective theory (NRQED). We report new results for all low-momentum contributions, and give a formula relating the remaining contributions to conventional (on-shell) QED scattering amplitudes.

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