Intrinsic five-quark Fock states of baryons and meson-nucleon $\sigma$-terms

Abstract

An extended chiral constituent quark approach, which embodies higher Fock five-quark components in the baryons wave-functions, is employed to study the sea quark content of the octet baryons. We report on the probabilities of $\bar{u}$, $\bar{d}$ and $\bar{s}$ in the nucleon, $\Lambda$, $\Sigma$ and $\Xi$ baryons, arising from the intrinsic five-quark states in the baryons wave functions. Based on those probabilities, results for meson-nucleon $\sigma$-terms; namely ${\sigma }_{\pi N},{\sigma }_{KN}$ and ${\sigma }_{\eta N}$, are presented.

Comments: Based on the talk presented by C. S An in QNP2012