Partons polarized

The parton model in polarized deep inelastic scattering... 

In Section 15.6 we introduced the formalism necessary for studying deep inelastic scattering using polarized electron or muon beams on polarized nucleon targets. Here we briefly present the parton model predictions for the structure functions Gi,2 and consider what may be learnt from the experiments with polarized beams and targets. 

Let us now consider what can be learnt about the parton structure from polarized deep inelastic experiments. In the quark-parton model (16.8.11) becomes... 

Although the subject is too technical to discuss in detail, we simply note that the analogue of the evolution equations of Sections 22.2 and 23.4 for the polarized parton number densities implies that the polarized gluon density AG x, must grow with Q. So perhaps a large gluonic contribution to (17.1.31) is not as odd as it seems at first sight. 

K. Simons, P. Dupree, L. A. Fiedler, T. Huber, T. Kobayashi, T. Kurzchalia, V. Olkkonen, S. Pimplikar, R. Parton, C. Dotti, Biogenesis of cell-surface polarity in epitheleal cells and neurons. Cold Spring Harbor Symposia on Quant. Biol. 57 (1992) 611. 

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