On baryon-antibaryon coupling to two photons

Abstract

We discuss recent claims that $p\bar{p}\to \gamma \gamma$ may be described by a generalized parton picture. We propose that quark-hadron duality provides a justification for the effective dominance of the "handbag" diagram assumed in recent literature, and that handbag diagrams may dominate phenomena in kinematic regions far more extensive than that might be expected from pQCD alone.

11 pages, 2 eps figures, minor modifications made, version to appear on Phys. Lett. B

References in corpus (10)

• Gauge-Invariant Decomposition of Nucleon Spin and Its Spin-Off
• Deeply Virtual Compton Scattering
• Off-Forward Parton Distributions
• Double distributions and evolution equations
• Linking Parton Distributions to Form Factors and Compton Scattering
• Symmetries and structure of skewed and double distributions
• The origins of quark-hadron duality: How does the square of the sum become the sum of the squares?
• The handbag contribution to gamma gamma to pi pi and K K
• Quark-Hadron Duality in Structure Functions
• Pedagogic model for Deeply Virtual Compton Scattering with quark-hadron duality

Cited by in corpus (3)

• Generalized Parton Distributions
• Quark-hadron duality in electron scattering
• Quark-Hadron Duality in Electron Scattering