Semi-Exclusive Processes: New Probes of Hadron Structure

Abstract

We define and study hard ``semi-exclusive'' processes of the form $A+B\to C+Y$ which are characterized by a large momentum transfer between the particles $A$ and $C$ and a large rapidity gap between the final state particle $C$ and the inclusive system $Y$. Such reactions are in effect generalizations of deep inelastic lepton scattering, providing novel currents which probe specific quark distributions of the target $B$ at fixed momentum fraction. We give explicit expressions for photo- and leptoproduction cross sections such as $\gamma p\to \pi Y$ in terms of parton distributions in the proton and the pion distribution amplitude. Semi-exclusive processes provide opportunities to study fundamental issues in QCD, including odderon exchange and color transparency, and suggest new ways to measure spin-dependent parton distributions.

arXiv commentRevTex, 6 pages

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Cited by in corpus (11)

• Quark-hadron duality in electron scattering
• Quark-Hadron Duality in Electron Scattering
• The Baryon Anomaly: Evidence for Color Transparency and Direct Hadron Production at RHIC
• Subprocess Size in Hard Exclusive Scattering
• Scaling and Duality in Semi-exclusive Processes
• QCD Constituent Counting Rules for Neutral Vector Mesons
• Recent Results from Decay-Angle Analyses of rho^0 Photoproduction at High Momentum Transfer from ZEUS
• Diffractive Interactions at DIS99: Experimental Summary
• Semi-exclusive DVCS
• Summary Talk on Quark-Hadron Duality
• Hard exclusive and semi-exclusive meson production