Flavor asymmetry of the polarized sea-quark distributions in the proton

Details Flavor asymmetry of the polarized sea-quark distributions in the proton Flavor asymmetry of the polarized sea-quark distributions in the proton

2010-03-12

arxiv.org/abs/1003.2457v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 5 figures

Scientific paper

The recent global analysis of helicity parton distributions, which takes into account available data from inclusive and semi-inclusive polarized deep inelastic scattering, as well as from polarized proton-proton scattering at RHIC, appears to offer the first strong evidence that polarized sea-quark distributions are flavor asymmetric, i.e. $\Delta \bar{u}(x) \ne \Delta \bar{d}(x)$. We point out that the flavor symmetry breaking pattern indicated by their analysis, i.e. $\Delta \bar{u}(x) > 0$ and $\Delta \bar{d}(x) < 0$ with the magnitude correlation $|\Delta \bar{u}(x)| < |\Delta \bar{d}(x)|$, is just consistent with our theoretical predictions given several years ago on the basis of the chiral quark soliton model. We also address ourselves to understanding the physics behind this observation.

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