Flavor asymmetry of the nucleon sea in an unquenched quark model

TL;DR

This paper investigates the flavor asymmetry in the nucleon sea using an unquenched quark model that explicitly includes quark-antiquark pairs, revealing an excess of anti-d over anti-u quarks in the proton.

Contribution

It introduces an unquenched quark model that explicitly incorporates quark-antiquark pairs to explain nucleon flavor asymmetry.

Findings

Inclusion of q anti-q pairs causes anti-d excess in the proton.

The model explains observed flavor asymmetry phenomena.

Provides a theoretical framework for nucleon sea structure.

Abstract

We discuss the flavor asymmetry of the nucleon in an unquenched quark model for baryons in which the effects of quark-antiquark pairs (u anti-u, d anti-d and s anti-s) are taken into account in an explicit form. It is shown that the inclusion of q anti-q pairs leads to an excess of anti-d over anti-u quarks in the proton.