Quarks and gluons in hadrons and nuclei Page: 23 of 31
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to x = 0.2, and so Bloom-Gilman duality may approximately hold true even for
polarized leptoproduction, with a Q2 dependence to the xc where gi(xc) = 0. The
first resonance P33(1236) sits on top of an S-wave background; the relative Q2
dependences are not well known. However, perturbative QCD applied to resonance
excitation suggests that this excitation may also change its character with Q2
such that its contribution to gi(x) changes sign at x + 0. It will be interesting
at CEBAF to verify if the resonance region indeed matches onto the deep inelastic,
and at high energy labs to verify whether gi(z + 0) < 0.
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Close, F. E. Quarks and gluons in hadrons and nuclei, article, December 1, 1989; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1058782/m1/23/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.