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

Abstract

We discuss how contributions to the order $\mathcal{O}(m{\alpha }^8)$ 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.

LATeX file, 7 pages

References in corpus (1)

• Nrqed in Bound States: Applying Renormalization to an Effective Field Theory

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