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

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 $I_a=\bar{d}-\bar{u}=0.118\pm 0.012$ 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.

typos corrected

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Cited by in corpus (3)

• The axial charges of proton within an extended chiral constituent quark model
• Investigations on the flavor-dependent axial charges of the octet baryons
• The quark orbital angular momentum of ground state octet baryons