gamma+gamma --> pi+pi, K+K : leading term QCD vs handbag model

Abstract

The "handbag" model was proposed as an alternative, at the present day energies, to the leading term QCD predictions for some hard exclusive processes. The recent precise data from the Belle Collaboration on the large angle cross sections $\gamma \gamma -->\pi \pi ,KK$ allow a check of these two approaches to be performed. It is shown that the handbag model fails to describe the data from Belle, while the leading term QCD predictions are in reasonable agreement with these data

arXiv comment12 pages, 4 figures, v4: reference added, small improvements in the text

References in corpus (2)

• Measurement of the gamma gamma -> pi+ pi- and gamma gamma -> K+ K- processes at energies of 2.4 - 4.1 GeV
• The handbag contribution to gamma gamma to pi pi and K K

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