Electromagnetic form factors of the $\Lambda$ and $\Sigma$ baryons in an alternative baryonic current approach

TL;DR

This paper uses light-cone sum rules with Ioffe type interpolating currents to analyze the electromagnetic form factors of $b1$ and $a3$ baryons, revealing differences in their magnetic form factor behaviors.

Contribution

It introduces an alternative baryonic current approach to study baryon form factors and compares effects of different interpolating currents on sum rule predictions.

Findings

Magnetic form factor of $b1$ approaches zero faster than dipole model predicts.

Magnetic form factor of $a3$ fits well with the dipole formula.

Choice of interpolating currents influences sum rule results.

Abstract

Light-cone sum rules are used to investigate the electromagnetic form factors of the $\Lambda$ and $\Sigma$ baryons by using the Ioffe type interpolating currents. The sum rules are affected to some extent by the choice of the interpolating currents from a comparison. Numerical calculations show that the magnetic form factor can be well fitted by the dipole formula for $\Sigma$ but not for $\Lambda$. The magnetic form factor of $\Lambda$ approaches zero with the momentum transfer faster than the dipole formula estimation.