Dresden 2000 – wissenschaftliches Programm
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T: Teilchenphysik
T 401: QCD 4
T 401.3: Vortrag
Dienstag, 21. März 2000, 17:00–17:15, H\,01
Helicity skewed quark distributions of the nucleon and chiral symmetry — •M. Penttinen, M.V. Polyakov, and K. Goeke — Institut für Theoretische Physik II, Ruhr–Universität Bochum, D–44780 Bochum, Germany
We compute the helicity skewed quark distributions H and E in the chiral quark-soliton model of the nucleon. This model emphasizes correctly the role of spontaneously broken chiral symmetry in structure of nucleon. It is based on the large-Nc picture of the nucleon as a soliton of the effective chiral lagrangian and allows to calculate the leading twist quark– and antiquark distributions at a low normalization point. We discuss the role of chiral symmetry in the helicity skewed quark distributions H and E. We show that generalization of soft pion theorems, based on chiral Ward identities, leads in the region of −ξ<x<ξ to the pion pole contribution to E which dominates at small momentum transfer. We showed that the pion pole contribution to E results in large single spin azimuthal asymmetry in hard exclusive productions of charged pions.