Observation of quark-hadron duality in gamma*-p helicity cross sections
Nuclear Theory
2011-04-05 v1 High Energy Physics - Experiment
High Energy Physics - Phenomenology
Nuclear Experiment
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.
Keywords
Cite
@article{arxiv.1101.2016,
title = {Observation of quark-hadron duality in gamma*-p helicity cross sections},
author = {S. P. Malace and W. Melnitchouk and A. Psaker},
journal= {arXiv preprint arXiv:1101.2016},
year = {2011}
}
Comments
15 pages, 5 figures