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Quark helicity flip and the transverse spin dependence of inclusive DIS [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 2007.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators
Thomas Jefferson National Accelerator Facility (U.S.), United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Inclusive DIS with unpolarized beam exhibits a subtle dependence on the transverse target spin, arising from the interference of one-photon and two-photon exchange amplitudes in the cross section. We argue that this observable probes mainly the quark helicity-flip amplitudes induced by the non-perturbative vacuum structure of QCD (spontaneous chiral symmetry breaking). This conjecture is based on (a) the absence of significant Sudakov suppression of the helicity-flip process if soft gluon emission in the quark subprocess is limited by the chiral symmetry breaking scale mu^2_{chiral} >> Lambda^2_{QCD}; (b) the expectation that the quark helicity-conserving twist-3 contribution is small. The normal target spin asymmetry is estimated to be of the order 10^{-4} in the kinematics of the planned Jefferson Lab Hall A experiment.
Report Numbers
E 1.99:jlab-thy-07-729
E 1.99: doe/or/23177-0149
doe/or/23177-0149
jlab-thy-07-729
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Note
Published through SciTech Connect.
05/21/2007.
"jlab-thy-07-729"
" doe/or/23177-0149"
Workshop on Exclusive Reactions at High Momentum Transfer, May 21-24, 2007, Newport News, VA.
Andrei Afanasev; Mark Strikman; Christian Weiss.
Funding Information
AC05-06OR23177
View MARC record | catkey: 13822937