Quark Model Description of Polarised Deep Inelastic Scattering and the prediction of $g_2$

Details Quark Model Description of Polarised Deep Inelastic Scattering and the prediction of $g_2$ Quark Model Description of Polarised Deep Inelastic Scattering and the prediction of $g_2$

1996-01-10

arxiv.org/abs/hep-ph/9601235v1

Phys.Lett. B373 (1996) 235-245

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex 17 pages plus 4 figures (uuencoded)

Scientific paper

10.1016/0370-2693(96)00116-5

We show how the operator product expansion evaluated in the approximation of ignoring gluons leads to the covariant formulation of the quark parton model. We discuss the connection with other formulations and show how the free quark model prediction, $g_2=0$, changes smoothly into the Wandzura-Wilczek (WW) relation for quark masses small relative to the nucleon mass. Previous contradictory parton model predictions are shown to follow from an inconsistent treatment of the mass shell conditions. The description is extended to include quark mass corrections.

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