NLO perturbative QCD predictions for gamma gamma -> M+ M- (M=pi,K)
arXiv:hep-ph/0607069 · doi:10.1103/PhysRevLett.97.142003
Abstract
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.
4 pages, 4 figures; parts rewritten, references and comments added, version as accepted for publication