Light-cone QCD Sum Rules for the $\Lambda$ Baryon Electromagnetic Form Factors and its magnetic moment

TL;DR

This paper develops light-cone QCD sum rules up to twist 6 to calculate the electromagnetic form factors and magnetic moment of the Lambda baryon, finding that twist 4 contributions dominate and results agree with experimental data.

Contribution

The paper introduces a comprehensive calculation of Lambda baryon form factors using light-cone QCD sum rules up to twist 6, highlighting the significance of twist 4 contributions.

Findings

Magnetic moment estimated as -0.64 μ_N, consistent with experimental data.

Twist 4 distribution amplitudes dominate the form factor results.

The approach aligns well with existing theoretical models.

Abstract

We present the light-cone QCD sum rules up to twist 6 for the electromagnetic form factors of the $\Lambda$ baryon. To estimate the magnetic moment of the baryon, the magnetic form factor is fitted by the dipole formula. The numerical value of our estimation is $\mu_\Lambda=-(0.64\pm0.04)\mu_N$, which is in accordance with the experimental data and the existing theoretical results. We find that it is twist 4 but not the leading twist distribution amplitudes that dominate the results.