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

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

2006-05-07

arxiv.org/abs/hep-ph/0605072v4

Phys.Lett. B640 (2006) 246-251

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1016/j.physletb.2006.08.016

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

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