Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-05-27
Phys.Lett. B405 (1997) 355-360
Physics
High Energy Physics
High Energy Physics - Phenomenology
ReVTeX + psfig, 7 pages, 3 figures (postscript), accepted in Physics Letters B, (pollock@lucky.colorado.edu)
Scientific paper
10.1016/S0370-2693(97)00659-X
We examine the $Q^2$ evolution of gluon polarization in polarized nucleons. As is well known, the evolution of $\alpha_s \Delta G(Q^2)$ is negligible for typical momentum transfer variations found in experimental deep inelastic scattering. As $\alpha_s$ increases, however, the leading nonzero term in the evolution equation for the singlet first moment reduces the magnitude of the gluon spin. At low $Q^2$ the term $\alpha_s \Delta G$ can vanish, and ultimately become negative. Thus, low energy model calculations yielding negative $\Delta G$ are not necessarily in conflict with experimental evidence for positive gluon polarization at high $Q^2$.
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