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

TL;DR

This paper uses an extended chiral constituent quark model to analyze the intrinsic five-quark components in baryons, revealing sea quark probabilities and their impact on meson-nucleon sigma terms, advancing understanding of baryon structure.

Contribution

It introduces a novel approach incorporating higher Fock five-quark states into baryon wave functions to study sea quark content and sigma terms.

Findings

Probabilities of sea quarks in various baryons are quantified.

Results provide new estimates for meson-nucleon sigma terms.

The approach enhances understanding of baryon internal structure.

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 $\sigma_{\pi N}, \sigma_{K N}$ and $\sigma_{\eta N}$, are presented.