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

TL;DR

This paper calculates the electromagnetic form factors of the heavy baryon mbda_b using the Bethe-Salpeter equation, revealing similarities to mbda but with smaller amplitudes.

Contribution

It introduces a Bethe-Salpeter equation approach to compute mbda_b's electromagnetic form factors considering a heavy quark and scalar diquark structure.

Findings

EM form factors of mbda_b are similar in shape to those of mbda.

The amplitudes of mbda_b form factors are significantly smaller than mbda.

Form factors peak around mbda_b's mbda mass region.

Abstract

The heavy baryon $\Lambda_b $ is regarded as composed of a heavy quark and a scalar diquark which has good spin and isospin quantum numbers. In this picture, we calculate the electromagnetic (EM) form factors of $\Lambda_b$ in the Bethe-Salpeter equation approach. We find that the shapes of the EM form factors of $\Lambda_b$ are similar to those of $\Lambda$, which have a peak at about $\omega=1$, but the amplitudes are much smaller than those of $\Lambda$.