Abstract
The strange form factors of nucleon are studied with the nonlocal chiral effective Lagrangian. One loop contributions from both octet and decuplet intermediate states are included. The relativistic regulator is obtained by the nonlocal Lagrangian where the gauge link is introduced to guarantee the local gauge symmetry. With the kaon loop, the calculated charge form factor is positive, while the magnetic form factor is negative. The strange magnetic moment is $-0.041^{+0.012}_{-0.014}$ with $\Lambda=0.9 \pm 0.1$ determined from the nucleon electromagnetic form factors. Our results are comparable with the recent lattice simulation.
Highlights
It is well known that a complete characterization of nucleon substructure must go beyond three valence quarks
The relativistic regulator is obtained by the nonlocal Lagrangian where the gauge link is introduced to guarantee the local gauge symmetry
We studied the strange form factors of nucleon with the nonlocal chiral effective Lagrangian
Summary
It is well known that a complete characterization of nucleon substructure must go beyond three valence quarks. Besides the above phenomenological models, heavy baryon and relativistic chiral perturbation theory have been widely applied to study the hadron spectrum and structure. Different regularization methods, such as the dimensional regularization, infrared regularization, extend on-mass-shell scheme (EOMS), etc, were used in the loop calculation. The obtained electric and magnetic form factors of nucleon are very close to the experimental data [42] This was the first time to calculate the form factors precisely at relatively large Q2 with chiral effective Lagrangian. We will apply the nonlocal chiral effective Lagrangian to study the strange form factors.
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