Radiative corrections to parapositronium decay |
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Authors: | Yukio Tomozawa |
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Affiliation: | Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109 USA |
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Abstract: | Radiative corrections to the two-gamma decay of parapositronium are examined. Special care is taken in the handling of the so-called binding diagram; in particular, the limiting procedure related to the infrared divergence is considered carefully. The general covariant gauges and the Fried-Yennie gauge are used in the computation to see that gauge invariance is accounted for. The order α correction of Harris and Brown is confirmed. In addition, from a sharp peak of the matrix element at low momentum and the low-momentum correction to the wave function, an α2 ln α?1 correction is derived. |
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