1996/08/28 by W. -D. Nowak, A. V. Sidorov, M. V. Tokarev
Physics and Astronomy · #hep-ph
published as Nuovo Cim. A110 (1997) 757-766 · 14 pages, latex, 12 figures
arxiv created 1996/08/28 · arxiv updated 2009/11/30
We investigate the possibility to draw conclusions on the sign of the spin-dependent gluon distribution, ΔG(x, Q2), from existing polarized DIS data. The spin-dependent parton distributions Δuv, Δdv, Δ u, Δ d, Δs, and ΔG are constructed in the framework of a phenomenological procedure taking into account some assumptions on signs of valence and sea parton distributions motivated by 't Hooft's mechanism of quark-quark interaction induced by instantons. The axial gluon anomaly and data on integral quark contributions to the proton spin, Δ u, Δ d, and Δ s, are also taken into account. Predictions for the x- and Q2-dependencies of the polarized proton and neutron structure functions, g1p and g1n, are compared to experimental data. It is shown that the neutron structure function, g1n, is especially sensitive to the sign of ΔG(x, Q2). The results of our analysis supports the conclusion that this sign should be positive.