Electromagnetic form factors of ${\Lambda }_c$ in the Bethe-Salpeter equation approach

Abstract

We study the electromagnetic form factors (EMFFs) of ${\Lambda }_c$ and the quark and diquark current contributes to the EMFFs of ${\Lambda }_c$ in the space-like (SL) region in the Bethe-Salpeter equation approach. In this picture, the heavy baryon ${\Lambda }_c$ 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 ${\Lambda }_c$ is very different, but the total contribute to the EMFFs of ${\Lambda }_c$ is similarly. The EMFFs of ${\Lambda }_c$ are similar to those of other baryons (proton, ${\Xi }^{-}$, ${\Sigma }^{+}$) with a peak at $\omega =1$ ($\omega =v^{\prime }\cdot v$ is the velocity transfer between the initial state (with velocity $v$) and the final state (with velocity $v^{\prime }$) of ${\Lambda }_c$).

arXiv commentarXiv admin note: substantial text overlap with arXiv:1612.06084

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