alpha^2 corrections to parapositronium decay

Details alpha^2 corrections to parapositronium decay alpha^2 corrections to parapositronium decay

1999-04-28

arxiv.org/abs/hep-ph/9904478v2

Phys.Rev.Lett. 83 (1999) 1135-1138

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, revtex

Scientific paper

10.1103/PhysRevLett.83.1135

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.

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