NLO perturbative QCD predictions for gamma gamma -> M+ M- (M=pi, K) (CROSBI ID 125358)
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Duplančić, Goran ; Nižić, Bene
engleski
NLO perturbative QCD predictions for gamma gamma -> M+ M- (M=pi, K)
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.
perturbative QCD; exclusive channel
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