Higher twist analysis of the proton g_1 structure function

Details Higher twist analysis of the proton g_1 structure function Higher twist analysis of the proton g_1 structure function

2004-04-22

arxiv.org/abs/hep-ph/0404195v2

Phys.Lett.B609:259-264,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 2 figures, to appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2005.01.071

We perform a global analysis of all available spin-dependent proton structure function data, covering a large range of Q^2, 1 < Q^2 < 30 GeV^2, and calculate the lowest moment of the g_1 structure function as a function of Q^2. From the Q^2 dependence of the lowest moment we extract matrix elements of twist-4 operators, and determine the color electric and magnetic polarizabilities of the proton to be \chi_E = 0.026 +- 0.015 (stat) + 0.021/-0.024 (sys) and \chi_B = -0.013 -+ 0.007 (stat) - 0.010/+0.012 (sys), respectively.

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