Non-perturbative structure of the polarized nucleon sea

We investigate the flavour and quark-antiquark structure of the polarized nucleon by calculating the parton distribution functions of the nucleon sea using the meson cloud model. We find that the SU(2) flavor symmetry in the light antiquark sea and quark-antiquark symmetry in the strange quark sea a...

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Bibliographic Details
Published in:arXiv.org 2003-08
Main Authors: Fu-Guang Cao, Signal, A I
Format: Article
Language:English
Subjects:
Asymmetry
Distribution functions
Flavor (particle physics)
Polarized light
Quarks
Symmetry
Online Access:Get full text
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Summary:We investigate the flavour and quark-antiquark structure of the polarized nucleon by calculating the parton distribution functions of the nucleon sea using the meson cloud model. We find that the SU(2) flavor symmetry in the light antiquark sea and quark-antiquark symmetry in the strange quark sea are broken, {\it i.e.} \(\Delta\ubar < \Delta \dbar\) and \(\Delta s < \Delta \sbar\). The polarization of the strange sea is found to be positive, which is in contradiction to previous analyses. We predict a much larger quark-antiquark asymmetry in the polarized strange quark sea than that in the unpolarized strange quark sea. Our results for both polarized light quark sea and polarized strange quark sea are consistent with the recent HERMES data.
ISSN:2331-8422
DOI:10.48550/arxiv.0306033