Non-perturbative Generation of Light Antiquark Flavor Asymmetry in Proton

Abstract

We compute the light antiquark flavor asymmetry in the proton using the Chiral Quark Model (${\chi }_{\mathrm{QM}}$). The distribution functions for the light antiquarks $\bar{d}(x)$ and $\bar{u}(x)$ have been extracted with the help of experimental data from NuSea/E866 and HERMES for the Bjorken$-x$ range $0.015<x<0.35$ as well from the most recent SeaQuest data for an extended $x$ range $0.13<x<0.45$. Our results on the $\bar{d}(x)-\bar{u}(x)$, $\frac{\bar{d}(x)}{\bar{u}(x)}$ and Gottfried Integral $I_G$ are in agreement with the experimental data and confirm the presence of enhanced $\bar{d}$ sea whose origin is purely non-perturbative based on chiral symmetry breaking in QCD.

Comments: 16 pages, 4 figures