Quark helicity flip and the transverse spin dependence of inclusive DISReport as inadecuate



 Quark helicity flip and the transverse spin dependence of inclusive DIS


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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.



Author: A. Afanasev; M. Strikman; C. Weiss

Source: https://archive.org/



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