Electromagnetic form factors of $Λ_c$ in the Bethe-Salpeter equation approach

Abstract

We study the electromagnetic form factors (EMFFs) of $Λ_c$ and the quark and diquark current contributes to the EMFFs of $Λ_c$ in the space-like (SL) region in the Bethe-Salpeter equation approach. In this picture, the heavy baryon $Λ_c $ is regarded as composed of a heavy quark and a scalar diquark. We find that for different values of parameters the quark and diquark current contribute to the EMFFs of $Λ_c$ is very different, but the total contribute to the EMFFs of $Λ_c$ is similarly. The EMFFs of $Λ_c$ are similar to those of other baryons (proton, $Ξ^-$, $Σ^+$) with a peak at $ω=1$ ($ω=v^\prime \cdot v $ is the velocity transfer between the initial state (with velocity $v$) and the final state (with velocity $v^\prime$) of $Λ_c$).