1105.2381 (Wen-Chen Chang et al.)

Extraction of Various Five-Quark Components of the Nucleons    [PDF]

Wen-Chen Chang, Jen-Chieh Peng

We have generalized the approach of Brodsky {\it et al.} for the intrinsic
charm quark distribution in the nucleons to the light-quark sector involving
intrinsic $\bar u, \bar d, s$ and $\bar s$ sea quarks. We compare the
calculations with the existing $\bar d - \bar u$, $s + \bar s$, and $\bar u +
\bar d - s -\bar s$ data. The good agreement between the theory and the data
allows the extraction of the probabilities for the $|uudu\bar{u}>$,
$|uudd\bar{d}>$, and $|uuds\bar{s}>$ five-quark Fock states in the proton. We
also calculate the $x$-dependence of the intrinsic charm after taking into
consideration the QCD evolution of the intrinsic quark distribution.

View original: http://arxiv.org/abs/1105.2381