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

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

2011-01-11

arxiv.org/abs/1101.2016v1

Phys.Rev.C83:035203,2011

Physics

Nuclear Physics

Nuclear Theory

15 pages, 5 figures

Scientific paper

10.1103/PhysRevC.83.035203

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.

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