Meson cloud and $SU(3)$ symmetry breaking in parton distributions

F. Carvalho; F.O. Durães; F.S. Navarra; M. Nielsen; F.M. Steffens

doi:doi:10.1007/s100520000512

EPJ

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2024 Impact factor 4.8

Particles and Fields

Eur. Phys. J. C 18, 127-136
DOI 10.1007/s100520000512

Meson cloud and SU(3) symmetry breaking
in parton distributions

F. Carvalho - F.O. Durães - F.S. Navarra - M. Nielsen - F.M. Steffens

Instituto de Física, Universidade de São Paulo, C.P. 66318, 05315-970 São Paulo, SP, Brazil

Received: 28 July 2000 / Published online: 23 October 2000 - © Springer-Verlag 2000

Abstract
We apply the meson cloud model to the calculation of non-singlet parton distributions in the nucleon sea, including the octet and the decuplet cloud baryon contributions. We give special attention to the differences between non-strange and strange sea quarks, trying to identify possible sources of SU(3) flavor breaking. An analysis in terms of the $\kappa$ parameter is presented, and we find that the existing SU(3) flavor asymmetry in the nucleon sea can be quantitatively explained by the meson cloud. We also consider the $\Sigma^+$ baryon, finding similar conclusions.