Sea quark contributions to nucleon electromagnetic form factors with the nonlocal chiral effective Lagrangian

TL;DR

This paper investigates sea quark contributions to nucleon electromagnetic form factors using a nonlocal chiral effective Lagrangian, including octet and decuplet states, revealing larger light quark effects and consistency with lattice data.

Contribution

It introduces a nonlocal chiral effective Lagrangian approach to compute sea quark contributions, including both octet and decuplet states, providing new insights into light sea quark effects.

Findings

Light quark form factors are larger than strange quark form factors.

D quark contributions exceed U quark contributions in both electric and magnetic form factors.

Results align with current lattice data for light-sea quark form factors.

Abstract

The sea quark contributions to the nucleon electromagnetic form factors from up, down and strange quarks are studied with the nonlocal chiral effective Lagrangian. Both octet and decuplet intermediate states are included in the one loop calculation. Compared with the strange form factors, though their signs are the same, the absolute value of the light quark form factors are much larger. For both electric and magnetic form factors, the contribution from $d$ quark is larger than that from $u$ quark. The current lattice data for the light-sea quark form factors are between our sea quark results for $u$ and $d$.