期刊
PHYSICAL REVIEW LETTERS
卷 97, 期 14, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.97.142003
关键词
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We report the first complete leading-twist next-to-leading-order perturbative-QCD predictions for the two-photon exclusive channels gamma gamma -> M+M- (M=pi,K) at large momentum transfer. The asymptotic distribution amplitude is utilized as a candidate form for the nonperturbative dynamical input. Comparison of the obtained results with the existing experimental data does not provide sufficiently clear evidence to support the applicability of the hard-scattering approach at currently accessible energies.
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