Polarized light-antiquark distributions in a meson-cloud model

Abstract

Flavor asymmetry is investigated in polarized light-antiquark distributions by a meson-cloud model. In particular, rho meson contributions to Delta u-bar - Delta d-bar are calculated. We point out that the g_2 part of rho contributes to the structure function g_1 of the proton in addition to the ordinary longitudinally polarized distributions in rho. This kind of contribution becomes important at medium x (>0.2) with small Q^2 (~1 GeV^2). Including N->rho N and N->rho Delta splitting processes, we obtain the polarized rho effects on the light-antiquark flavor asymmetry in the proton. The results show Delta d-bar excess over Delta u-bar, which is very different from some theoretical predictions. Our model could be tested by experiments in the near future.

13 pages, REVTeX4b5, revtex4.cls, url.sty, natbib.sty, 10pt.rtx, aps.rtx, revsymb.sty, 12 eps figures. Submitted for publication. Email: [email protected], [email protected]. and http://hs.phys.saga-u.ac.jp

References in corpus (3)

• Improved Measurement of the $\bar{d}/\bar{u}$ Asymmetry in the Nucleon Sea
• Towards a global analysis of polarized parton distributions
• The flavour asymmetry of polarized anti-quarks in the nucleon

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