Some {rm O}(alpha^2) annihilation type contributions to the orthopositronium width |
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Authors: | V. Antonelli V. Ivanchenko E. Kuraev V. Laliena |
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Affiliation: | (1) Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland , CH;(2) Institute of Nuclear Physics, Siberian Division, 630090 Novosibirsk, Russia , RU;(3) JINR, 141980 Dubna, Russia , RU |
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Abstract: | We consider some radiative corrections to the lowest order annihilation diagram for the orthopositronium decay rate. The insertion of the renormalized vertex correction in the annihilation graph gives . We compute also the contribution of the square of the lowest order annihilation amplitude, which turns out to be . Finally, we obtain a term arising from the correction to the light–light scattering block due to the exchange of one coulombic photon, in agreement with earlier computations. Received: 10 December 1997 / Published online: 24 March 1998 |
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