Polarized antiquark flavor asymmetry: Pauli blocking vs. the pion cloud

Details Polarized antiquark flavor asymmetry: Pauli blocking vs. the pion cloud Polarized antiquark flavor asymmetry: Pauli blocking vs. the pion cloud

2002-04-05

arxiv.org/abs/hep-ph/0204060v1

Eur.Phys.J.A17:509-512,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, revtex, 3 eps figures

Scientific paper

10.1140/epja/i2002-10161-2

The flavor asymmetry of the unpolarized antiquark distributions in the proton, dbar(x) - ubar(x) > 0, can qualitatively be explained either by Pauli blocking by the valence quarks, or as an effect of the pion cloud of the nucleon. In contrast, predictions for the polarized asymmetry Delta_ubar(x) - Delta_dbar(x) based on rho meson contributions disagree even in sign with the Pauli blocking picture. We show that in the meson cloud picture a large positive Delta_ubar(x) - Delta_dbar(x) is obtained from pi-N - sigma-N interference-type contributions, as suggested by chiral symmetry. This effect restores the equivalence of the 'quark' and 'meson' descriptions also in the polarized case.

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