Factorization for hard exclusive electroproduction of mesons in QCD

Journal Article · Mon Sep 01 00:00:00 EDT 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.56.2982· OSTI ID:538722

Collins, J C ^[1]; Frankfurt, L ^[2]; Strikman, M ^[1]

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1. Department of Physics, Penn State University, 104 Davey Lab., University Park, Pennsylvania 16802 (United States)
2. Physics Department, Tel-Aviv University, Tel Aviv (Israel)

We formulate and prove a QCD factorization theorem for hard exclusive electroproduction of mesons in QCD. The proof is valid for the leading power in Q and all logarithms. This generalizes previous work on vector meson production in the diffractive region of small x. The amplitude is expressed in terms of off-diagonal generalizations of the usual parton densities. The full theorem applies to all kinds of mesons and not just to vector mesons. The parton densities used include not only the ordinary parton density, but also the helicity density (g{sub 1} or {Delta}q) and the transversity density (h{sub 1} or {delta}q), and these can be probed by measuring the polarization of the produced mesons with unpolarized protons. {copyright} {ital 1997} {ital The American Physical Society}

• DOE Contract Number: FG02-90ER40577; FG02-93ER40771
• OSTI ID: 538722
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 5 Vol. 56; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DENSITY
ELECTRON-PROTON INTERACTIONS
ELECTROPRODUCTION
EXCLUSIVE INTERACTIONS
FACTORIZATION
HELICITY
MESONS
PARTON MODEL
PARTONS
POLARIZATION
QUANTUM CHROMODYNAMICS
VECTOR MESONS