Twist-3 contributions to wide-angle photoproduction of pions

Abstract

We investigate wide-angle pi^0 photoproduction within the handbag approach to twist-3 accuracy. In contrast to earlier work both the 2-particle as well as the 3-particle twist-3 contributions are taken into account. It is shown that both are needed for consistent results that respect gauge invariance and crossing properties. The numerical studies reveal the dominance of the twist-3 contribution. With it fair agreement with the recent CLAS measurement of the pi^0 cross section is obtained. We briefly comment also on wide-angle photoproduction of other pseudoscalar mesons.

36 pages, 6 figures using latex, minor changes, accepted for publication

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Cited by in corpus (9)

• Probing axial quark generalized parton distributions through exclusive photoproduction of a $\gamma {\pi }^{\pm }$ pair with a large invariant mass
• Double Polarization Observables in Pentaquark Photoproduction
• Extraction of beam-spin asymmetries from the hard exclusive ${\pi }^{+}$ channel off protons in a wide range of kinematics
• Pseudoscalar meson decay constants and distribution amplitudes up to twist-4 in the light-front quark model
• Generalized Parton Distributions from charged current meson production
• Wide-angle photo- and electroproduction of pions to twist-3 accuracy
• Hard exclusive processes involving kaons
• Twist-3 contribution to deeply virtual electroproduction of pions
• Twist-3 contributions to $\gamma \gamma \to {\pi }^{+}{\pi }^{-},K^{+}{K}^{-}$ processes in perturbative QCD approach