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

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.

Comments: 17 pages, 14 figures, accepted for publication in Phys. Rev. D