期刊
JETP LETTERS
卷 87, 期 10, 页码 531-536出版社
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0021364008100032
关键词
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The Mellin-Barnes representation is used to improve the theoretical estimate of mass corrections to the width of a light pseudoscalar meson decay into a lepton pair, P -> l(+)l(-). The full resummation of the terms ln(m(l)(2)/Lambda(2))(m(l)(2)/Lambda(2))(n) and (m(l)(2)/Lambda(2))(n) to the decay amplitude is performed, where m(l) is the lepton mass and Lambda approximate to m(rho) is the characteristic scale of the P -> gamma*gamma* form factor. The total effect of the mass corrections for the e(+)e(-) channel is negligible and, for the mu(+)mu(-) channel, its order is of a few percent.
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