Final-State Interactions and Single-Spin Asymmetries in Semi-inclusive Deep Inelastic Scattering

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Recent measurements from the HERMES and SMC collaborations show a remarkably large azimuthal single-spin asymmetries A{sub UL} and A{sub UT} of the proton in semi-inclusive pion leptoproduction {gamma}*(q)p {yields} {pi}X. We show that final-state interactions from gluon exchange between the outgoing quark and the target spectator system leads to single-spin asymmetries in deep inelastic lepton-proton scattering at leading twist in perturbative QCD; i.e., the rescattering corrections are not power-law suppressed at large photon virtuality q{sup 2} at fixed x{sub bj}. The existence of such single-spin asymmetries requires a phase difference between two amplitudes coupling the proton target with J{sup z}{sub ... continued below

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8 pages

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Brodsky, Stanley J.; /SLAC; Hwang, Dae Sung; U., /SLAC /Sejong; Schmidt, Ivan & /Santa Maria U., Valparaiso November 14, 2007.

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Recent measurements from the HERMES and SMC collaborations show a remarkably large azimuthal single-spin asymmetries A{sub UL} and A{sub UT} of the proton in semi-inclusive pion leptoproduction {gamma}*(q)p {yields} {pi}X. We show that final-state interactions from gluon exchange between the outgoing quark and the target spectator system leads to single-spin asymmetries in deep inelastic lepton-proton scattering at leading twist in perturbative QCD; i.e., the rescattering corrections are not power-law suppressed at large photon virtuality q{sup 2} at fixed x{sub bj}. The existence of such single-spin asymmetries requires a phase difference between two amplitudes coupling the proton target with J{sup z}{sub p} = {+-}1/2 to the same final-state, the same amplitudes which are necessary to produce a nonzero proton anomalous magnetic moment. We show that the exchange of gauge particles between the outgoing quark and the proton spectators produces a Coulomb-like complex phase which depends on the angular momentum L{sup z} of the proton's constituents and thus is distinct for different proton spin amplitudes. The single-spin asymmetry which arises from such final-state interactions does not factorize into a product of structure function and fragmentation function, and it is not related to the transversity distribution {delta}q(x;Q) which correlates transversely polarized quarks with the spin of the transversely polarized target nucleon.

Physical Description

8 pages

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  • Journal Name: Int.J.Mod.Phys.A18:1327-1334,2003; Conference: Prepared for 3rd Circum-Pan-Pacific Symposium on High Energy Spin Physics (SPIN 2001), Beijing, China, 8-13 Oct 2001

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  • Report No.: SLAC-PUB-13002
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 919783
  • Archival Resource Key: ark:/67531/metadc901816

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • November 14, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 7, 2016, 11:43 a.m.

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Brodsky, Stanley J.; /SLAC; Hwang, Dae Sung; U., /SLAC /Sejong; Schmidt, Ivan & /Santa Maria U., Valparaiso. Final-State Interactions and Single-Spin Asymmetries in Semi-inclusive Deep Inelastic Scattering, article, November 14, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc901816/: accessed April 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.