alpha^2 corrections to parapositronium decay

Abstract

Two-loop QED corrections to the decay rate of parapositronium (p-Ps) into two photons are presented. We find Gamma(p-Ps --> 2 photons) = 7989.64(2)/microsec. The non-logarithmic O(alpha^2) corrections turn out to be small, contrary to some earlier estimates. We speculate that the so-called ``orthopositronium lifetime puzzle'' will not likely be solved by large QED corrections.

4 pages, revtex

References in corpus (1)

• Analytic evaluation of the amplitudes for orthopositronium decay to three photons to one-loop order

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