# Orbital angular momentum of the proton and intrinsic five-quark Fock states

## TL;DR

This paper investigates the orbital angular momentum of the proton by modeling intrinsic five-quark states and calculating contributions from different flavors, aligning results with experimental sea flavor asymmetry data.

## Contribution

It introduces an extended constituent quark model to quantify the proton's orbital angular momentum considering intrinsic five-quark states and flavor contributions.

## Key findings

- Orbital angular momentum of the proton is estimated as 0.158 ± 0.014.
- Results agree with the relation 4/3 times sea flavor asymmetry.
- Findings are consistent with other theoretical approaches.

## Abstract

The orbital angular momentum ($L_q$) of the proton is studied by employing the extended constituent quark model. Contributions from different flavors, namely, up, down, strange, and charm quarks in the proton are investigated. Probabilities of the intrinsic $q\bar{q}$ pairs are calculated using a $^{3}P_{0}$ transition operator to fit the sea flavor asymmetry $I_a=\bar{d}-\bar{u}=0.118\pm0.012$ of the proton. Our numerical results lead to $L_q=0.158 \pm 0.014$, in agreement with $4/3I_a=0.157 \pm 0.016$, and consistent with findings based on various other approaches.