Higher twists in spin structure functions from a "constituent quark" point of view

Details Higher twists in spin structure functions from a "constituent quark" point of view Higher twists in spin structure functions from a "constituent quark" point of view

2004-10-19

arxiv.org/abs/hep-ph/0410253v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 3 figures. To appear in the proceedings of the 3rd International Symposium on the Gerasimov-Drell-Hearn Sum Rule and

Scientific paper

We discuss the implications of a "constituent quark" structure of the nucleon for the leading (1/Q^2-) power corrections to the spin structure functions. Our basic assumption is the presence of quark-gluon correlations in the nucleon wave function, whose size, rho ~ 0.3 fm, is small compared to the nucleon radius, R (two-scale picture). We argue that in this picture the isovector twist-4 matrix element in the proton has a sizable negative value, M_N^2 |f_2^{u - d}| ~ rho^{-2}, while the twist-3 matrix elements are small, M_N^2 d_2 ~ R^{-2}. These findings are in agreement with the result of a QCD fit to the g_1 world data, including recent neutron data from HERMES and Jefferson Lab Hall A, which gives M_N^2 f_2^{u - d} = -0.28 +/- 0.08 GeV^2.

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