Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-11-14
Phys.Lett. B395 (1997) 318-326
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, Latex, 2 figures included
Scientific paper
10.1016/S0370-2693(97)00093-2
The gluon polarization $\Delta G$ in a nucleon can be defined in a gauge invariant way as the integral over the Ioffe-time distribution of polarized gluons. We argue that for sufficiently regular polarized gluon distributions $\Delta G$ is dominated by contributions from small and moderate values of the Ioffe-time z < 10. As a consequence $\Delta G$ can be estimated with 20% accuracy from the first two even moments of the polarized gluon distribution, and its behavior at small values of Bjorken x or, equivalently, at large Ioffe-times z. We employ this idea and compute the first two moments of the polarized gluon distribution within the framework of QCD sum rules. Combined with the color coherence hypothesis we obtain an upper limit for $\Delta G \sim 2 \pm 0.5$ at a typical scale $\mu^2 \sim 1 GeV^2$.
Mankiewicz Lech
Piller Gunther
Saalfeld Axel
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