Valence Quark Polarization In the Nucleon And the Deuteron Data

Details Valence Quark Polarization In the Nucleon And the Deuteron Data Valence Quark Polarization In the Nucleon And the Deuteron Data

2008-08-21

arxiv.org/abs/0808.2921v1

Phys.Lett.B668:193-196,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 5 figures To appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2008.08.043

Within the framework of the so-called "valon" model, we argue that a substantial part of the nucleon spin, about 40%, is carried by the polarized valence quarks. The remaining is the result of cancellations between gluon polarization and the orbital angular momentum, where the gluon polarization is the dominant one. It is shown that the sea quark contribution to the spin of any hadron is simply marginal and consistent with zero. Our findings point to a substantially smaller value for a_8 thaninferred from hyperon- $\beta$ decay, suggesting that fullSU(3) symmetric assumption needs to be reconsidered. New and emerging experimental data tend to support this finding. Finally, we show that within the model described here the experimental data on the polarized structure functions $g_{1}^{p,n,d}$ are reproduced.

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