Soft Rescattering in DIS: Effects of Helicity Flip

Abstract

Soft rescattering in hard QCD processes may involve non-perturbative, chiral symmetry breaking interactions. We find that rescattering which changes the helicity of the struck quark gives rise to a leading twist single spin asymmetry in semi-inclusive DIS, the angular dependence of which is the same as that usually ascribed to the Collins effect. We argue that helicity-changing rescattering can contribute also to $k_{\perp }$-integrated parton distributions.

arXiv comment9 pages, 1 figure. v2: reference added

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• Single-spin asymmetries in SIDIS induced by anomalous gluon-quark and photon-quark couplings
• Single-spin asymmetry from pomeron-odderon interference