Moments of polarized parton distribution functions
U. L. Pasteur, LPT, Strasbourg, France
2 Theoretische Physik T39, Physik Department, TU München, Garching, Germany
3 FZ Jülich, IKP(Th), Jülich, Germany
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We present novel results for the first moment of the spin-dependent structure function g 1(x,Q 2) of the nucleon at “small” (Q 2 < 0.3 GeV2) photon virtuality in the framework of a relativistic formulation of baryon chiral perturbation theory. We perform a next-to-leading order calculation and obtain significant differences to previously found results based on the heavy-baryon approach for the proton and neutron.
© Società Italiana di Fisica and Springer-Verlag, 2003