Polarized Parton Distributions in the Photon and Factorization Scheme Dependence

Details Polarized Parton Distributions in the Photon and Factorization Scheme Dependence Polarized Parton Distributions in the Photon and Factorization Scheme Dependence

1999-11-20

arxiv.org/abs/hep-ph/9911424v2

Phys.Lett. B473 (2000) 309-317

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, LaTeX, 3 postscript figures; one page shortened, refined arguments, no change in results and conclusions

Scientific paper

10.1016/S0370-2693(99)01506-3

Spin-dependent parton distributions in the polarized virtual photon are investigated in QCD up to the next-to-leading order (NLO). In the case $\Lambda^2 \ll P^2 \ll Q^2$, where $-Q^2$ ($-P^2$) is the mass squared of the probe (target) photon, parton distributions can be predicted completely up to the NLO, but they are factorization-scheme-dependent. Parton distributions are analyzed in four different factorization schemes and their scheme dependence are discussed. Particular attentions are paid to the axial anomaly effect on the first moments of quark parton distributions, and also to the large-$x$ behaviors of the parton distributions. Gluon distribution in the virtual photon is found to be factorization-scheme independent up to the NLO.

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