NLO perturbative QCD predictions for gamma gamma -> M+ M- (M=pi,K)

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.

arXiv comment4 pages, 4 figures; parts rewritten, references and comments added, version as accepted for publication

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• Central exclusive production as a probe of the gluonic component of the eta' and eta mesons
• Two-photon annihilation into octet meson pairs: symmetry relations in the handbag approach
• Hard exclusive two photon processes in QCD
• Exclusive production of large invariant mass pion pairs in ultraperipheral ultrarelativistic heavy ion collisions
• Exclusive γ*γprocesses
• $\gamma \gamma \to M^{+}{M}^{-}(M=\pi ,K)$ processes with twist-3 corrections in QCD
• Twist-3 contributions to $\gamma \gamma \to {\pi }^{+}{\pi }^{-},K^{+}{K}^{-}$ processes in perturbative QCD approach