Nonperturbative Quark Sea Asymmetries

TL;DR

This paper investigates the flavor structure of the quark sea in octet baryons using the chiral constituent quark model, highlighting the significance of nonperturbative effects at low Bjorken x values.

Contribution

It demonstrates how the chiral constituent quark model can qualitatively explain quark sea asymmetries in octet baryons, emphasizing nonperturbative contributions.

Findings

Quark sea asymmetries are significant at low x values.

The model explains the qualitative behavior of $ar d(x)-ar u(x)$ and related ratios.

Results support the importance of nonperturbative effects in baryon structure.

Abstract

The effects of nonperturbatively generated ``quark sea'' have been investigated to determine the flavor structure of the octet baryons. The chiral constituent quark model ($\chi$CQM), which is known to provide a satisfactory explanation of the proton spin and related issues in the nonperturbative regime, is able to explain the qualitative generation of the requisite amount of quark sea. The importance of quark sea has been studied at different values of the Bjorken scaling variable $x$ by including it phenomenologically in the sea quark distribution functions. The results for the quark sea asymmetries like $\bar d(x)-\bar u(x)$, $\bar d(x)/\bar u(x)$ and Gottfried integral for the octet baryons strengthen the significance of quark sea at lower values of $x$.