Virtual annihilation contribution to orthopositronium decay rate
classification
✦ hep-ph
keywords
alphaannihilationcontributiondecaygammaorthopositroniumratevirtual
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Order alpha^2 contribution to the orthopositronium decay rate due to one-photon virtual annihilation is found to be delta Gamma = (alpha/pi)^2 (pi^2 ln(alpha) - 0.8622(9))Gamma_LO.
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