Single-Spin Asymmetries and Transversity in QCD

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Initial- and final-state interactions from gluon exchange, normally neglected in the parton model, have a profound effect in QCD hard-scattering reactions, leading to leading-twist single-spin asymmetries, diffractive deep inelastic scattering, diffractive hard hadronic reactions, as well as nuclear shadowing and antishadowing-leading-twist physics not incorporated in the light-front wavefunctions of the target computed in isolation. The physics of such processes thus require the understanding of QCD at the amplitude level; in particular, the physics of spin requires an understanding of the phase structure of final-state and initial-state interactions, as well as the structure of the basic wavefunctions of hadrons themselves. I ... continued below

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15 pages

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Brodsky, S.J. & /SLAC December 14, 2005.

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Initial- and final-state interactions from gluon exchange, normally neglected in the parton model, have a profound effect in QCD hard-scattering reactions, leading to leading-twist single-spin asymmetries, diffractive deep inelastic scattering, diffractive hard hadronic reactions, as well as nuclear shadowing and antishadowing-leading-twist physics not incorporated in the light-front wavefunctions of the target computed in isolation. The physics of such processes thus require the understanding of QCD at the amplitude level; in particular, the physics of spin requires an understanding of the phase structure of final-state and initial-state interactions, as well as the structure of the basic wavefunctions of hadrons themselves. I also discuss transversity in exclusive channels, including how one can use single-spin asymmetries to determine the relative phases of the timelike baryon form factors, as well as the anomalous physics of the normal-normal spin-spin correlation observed in large-angle proton-proton elastic scattering. As an illustration of the utility of light-front wavefunctions, the transversity distribution of a single electron is computed, as defined from its two-particle QED quantum fluctuations.

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15 pages

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  • Prepared for International Workshop on Transverse Polarization Phenomena in Hard Processes (Transversity 2005), Villa Olmo, Como, Italy, 7-10 Sep 2005

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  • Report No.: SLAC-PUB-11568
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 877485
  • Archival Resource Key: ark:/67531/metadc880851

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  • December 14, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 1, 2016, 10:20 p.m.

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Brodsky, S.J. & /SLAC. Single-Spin Asymmetries and Transversity in QCD, article, December 14, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc880851/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.