Observation of quark-hadron duality in gamma*-p helicity cross sections

Abstract

Combining data on unpolarized and polarized inclusive proton structure functions, we perform the first detailed study of quark-hadron duality in individual helicity-1/2 and 3/2 virtual photoproduction cross sections. We find that duality is realized more clearly in the helicity-1/2 channel, with duality violating corrections < 10% over the entire nucleon resonance region, while larger, < 20% corrections are found in the helicity-3/2 sector. The results are in general agreement with quark model expectations, and suggest that data above the Delta resonance region may be used to constrain both spin-averaged and spin-dependent parton distributions.

15 pages, 5 figures

References in corpus (4)

• QCD Analysis of the Polarized World Data
• Effect of Orbital Angular Momentum on Valence-Quark Helicity Distributions
• The Onset of Quark-Hadron Duality in Pion Electroproduction
• Quark-Hadron Duality in Neutron (3He) Spin Structure

Cited by in corpus (4)

• Measurement of Parity-Violating Asymmetry in Electron-Deuteron Inelastic Scattering
• Resonant contributions to inclusive nucleon structure functions from exclusive meson electroproduction data
• Direct observation of quark-hadron duality in the free neutron F_2 structure function
• Resonant contributions to polarized proton structure functions