Extraction of Various Five-Quark Components of the Nucleons

Abstract

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.

Comments: 4 pages, 4 figures; version published; Wrong page number of Ref. [3] is corrected