Effect of Orbital Angular Momentum on Valence-Quark Helicity Distributions

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dc.creatorAvakian, Harut
dc.creatorBrodsky, Stanley J.
dc.creatorDeur, Alexandre
dc.creatorYuan, Feng
dc.date2007-05-10
dc.date2007-05-13
dc.date.accessioned2026-07-07T12:13:30Z
dc.date.available2026-07-07T12:13:30Z
dc.descriptionWe study the quark helicity distributions at large x in perturbative QCD, taking into account contributions from the valence Fock states of the nucleon which have nonzero orbital angular momentum. These states are necessary to have a nonzero anomalous magnetic moment. We find that the quark orbital angular momentum contributes a large logarithm to the negative helicity quark distributions in addition to its power behavior, scaling as (1-x)^5\log^2(1-x) in the limit of x\to 1. Our analysis shows that the ratio of the polarized over unpolarized down quark distributions, Δd/d, will still approach 1 in this limit. By comparing with the experimental data, we find that this ratio should cross zero at x\approx 0.75.
dc.description10 pages, 3 eps figures
dc.identifierhttps://arxiv.org/abs/0705.1553
dc.identifierhttp://arxiv.org/abs/0705.1553
dc.identifierPhys.Rev.Lett.99:082001,2007
dc.identifierdoi:10.1103/PhysRevLett.99.082001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/210867
dc.subjectHigh Energy Physics - Phenomenology
dc.titleEffect of Orbital Angular Momentum on Valence-Quark Helicity Distributions
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