Eur. Phys. J. A (2003) 18: 503-505
https://doi.org/10.1140/epja/i2002-10270-x
https://doi.org/10.1140/epja/i2002-10270-x
Moments of polarized parton distribution functions
1
U. L. Pasteur, LPT, Strasbourg, France
2
Theoretische Physik T39, Physik Department, TU München, Garching, Germany
3
FZ Jülich, IKP(Th), Jülich, Germany
* e-mail: themmert@physik.tu-muenchen.de
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
