Vacuum polarization correction to the positronium decay rate
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Corrections $\sim α^2 $ to the positronium decay rate, induced by one--loop vacuum polarization diagram, are calculated. Their relative values are $0.4468(3)(α/π)^2$ for para- and $0.960(3)(α/π)^2$ for orthopositronium.
10 pages, LaTeX
10 pages, LaTeX