Isovector unpolarized quark distribution in the nucleon in the large-N_c limit

Details Isovector unpolarized quark distribution in the nucleon in the large-N_c limit Isovector unpolarized quark distribution in the nucleon in the large-N_c limit

1998-04-28

arxiv.org/abs/hep-ph/9804436v1

Phys.Rev.D59:034024,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

31 pages, LaTeX, 1 table, 4 figures included using epsf

Scientific paper

10.1103/PhysRevD.59.034024

We calculate the isovector (flavor-nonsinglet) unpolarized quark- and antiquark distributions in the nucleon at a low normalization point in the large-N_c limit. The nucleon is described as a soliton of the effective chiral theory. The isovector distribution appears in the next-to-leading order of the 1/N_c-expansion. Numerical results for the quark- and antiquark distributions compare well with the parametrizations of the data at a low normalization point. This large-N_c approach gives a flavor asymmetry of the antiquark distribution (violation of the Gottfried sum rule) in good agreement with the measurements.

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