ar X iv : h ep - p h / 96 04 26 4 v 1 8 A pr 1 99 6 Polarized Structure Function g 2 in the CM bag model
نویسنده
چکیده
The spin-dependent structure functions g 1 (x), g 2 (x), g W W 2 (x) and ¯ g 2 (x) and their moments are studied in the CM bag model. The results show that (i) 1 0 g 2 (x)dx = 0, i.e. the Burkhardt-Cottingham sum rule holds, hence g 2 (x) must have at least one non-trivial zero besides x = 0 and x = 1. 1 0 x 2 g 2 (x)dx is negative for the proton, neutron and deuteron. (iii) 1 0 x 2 g 2 (x)dx is about one order of magnitude smaller than 1 0 x 2 g 1 (x)dx, hence the twist-3 matrix element is approximately equal to the twist-2 matrix element. The results are compared with most recent data and predictions from the MIT bag model, lattice QCD and QCD sum rules.
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