Quark helicity flip and the transverse spin dependence of inclusive DIS

Details Quark helicity flip and the transverse spin dependence of inclusive DIS Quark helicity flip and the transverse spin dependence of inclusive DIS

2007-09-27

arxiv.org/abs/0709.4293v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 4 figures. Proceedings of Workshop on Exclusive Reactions at High Momentum Transfer, Jefferson Lab, 21-24 May 2007

Scientific paper

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_chiral^2 >> Lambda_QCD^2; (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.

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