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The experimental data taken from both Drell-Yan and deep-inelastic scattering(DIS) experiments suggest a sign-change in $\bar d(x) - \bar u(x)$ flavorasymmetry in the proton at large values of momentum fraction $x$. In this work,we present a phenomenological study of $\bar d(x) - \bar u(x)$ flavorasymmetry. First, we extract the $\bar d(x)-\bar u(x)$ distribution using themore recent data from the BONuS experiment at Jefferson Lab on the ratio ofneutron to proton structure functions, $F_2^n/F_2^p$, and show that itundergoes a sing-change and becomes negative at large values of momentumfraction $x$, as expected. The stability and reliability of our obtainedresults have been examined by including target mass corrections (TMCs) as wellas higher twist (HT) terms which are particularly important at the large-$x$region at low Q$^2$. Then, we calculate the $\bar d(x) - \bar u(x)$distribution using the Brodsky, Hoyer, Peterson, and Sakai (BHPS) model andshow that if one chooses a mass for the down quark smaller than the one for theup quark it leads to a better description for the Fermilab E866 data. In orderto prove this claim, we determine the masses of down and up sea quarks byfitting to the available and up-to-date experimental data for the $\bard(x)-\bar u(x)$ distribution. In this respect, unlike the previous performedtheoretical studies, we have shown that this distribution has a sign-change at$x>0.3$ after evolution to the scale of available experimental data.

physical review. c

Improved determination of $\bar d(x) - \bar u(x)$ flavor asymmetry in  the proton by BONuS experiment at JLAB and using an approach by Brodsky,  Hoyer, Peterson, and Sakai