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Inclusive DIS with unpolarized beam exhibits a subtle dependence on thetransverse target spin, arising from the interference of one-photon andtwo-photon exchange amplitudes in the cross section. We argue that thisobservable probes mainly the quark helicity-flip amplitudes induced by thenon-perturbative vacuum structure of QCD (spontaneous chiral symmetrybreaking). This conjecture is based on (a) the absence of significant Sudakovsuppression of the helicity-flip process if soft gluon emission in the quarksubprocess is limited by the chiral symmetry-breaking scale mu_chiral^2 >>Lambda_QCD^2; (b) the expectation that the quark helicity-conserving twist-3contribution is small. The normal target spin asymmetry is estimated to be ofthe order 10^{-4} in the kinematics of the planned Jefferson Lab Hall Aexperiment.

Quark helicity flip and the transverse spin dependence of inclusive DIS