QCD Constrains on the Shape of Polarized Quark and Gluon Distributions

Details QCD Constrains on the Shape of Polarized Quark and Gluon Distributions QCD Constrains on the Shape of Polarized Quark and Gluon Distributions

1994-01-25

arxiv.org/abs/hep-ph/9401328v2

Nucl.Phys.B441:197-214,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

Correct version of Fig. 1 added, LaTex, 27 pages, plus 4 figures

Scientific paper

10.1016/0550-3213(95)00009-H

We develop simple analytic representations of the polarized quark and gluon distributions in the nucleon at low $Q^2$ which incorporate general constraints obtained from the requirements of color coherence of gluon couplings at $x \sim 0$ and the helicity retention properties of perturbative QCD couplings at $x \sim 1.$ The unpolarized predictions are similar to the $D_0'$ distributions given by Martin, Roberts, and Stirling. The predictions for the quark helicity distributions are compared with polarized structure functions measured by the E142 experiment at SLAC and the SMC experiment at CERN.

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