$\Sigma_{b}\to\Sigma_c$ and $\Omega_b\to\Omega_c$ weak decays in the light-front quark model

TL;DR

This paper calculates the weak decay rates of heavy baryons $\\Sigma_b$ and $\\Omega_b$ using the light-front quark model, providing predictions relevant for experiments at LHCb and exploring heavy baryon transition form factors.

Contribution

It introduces a quark-diquark model for heavy baryon decays and derives form factors related to Isgur-Wise functions within the light-front framework, offering new decay rate predictions.

Findings

Decay rate of $\Sigma_b \to \Sigma_c e\nu_e$ is approximately $1.38 \times 10^{10}$ s$^{-1}$.

Decay rate of $\Sigma_b \to \Sigma_c + M$ is slightly below $1 \times 10^{10}$ s$^{-1}$.

Estimated decay rates for $\Omega_b \to \Omega_c$ suggest measurable signals at LHCb.

Abstract

The successful operation of LHC provides a great opportunity to study the processes where heavy baryons are involved. {In this work we mainly study} the weak transitions of $\Sigma_b\to \Sigma_c$. Assuming the reasonable quark-diquark structure where the two light quarks constitute an axial vector, we calculate the widths of semi-leptonic decay $\Sigma_{b}\to\Sigma_c e\nu_e$ and non-leptonic decay modes $\Sigma_{b}\to\Sigma_c +M$ (light mesons) in terms of the light front quark model. We first construct the vertex function for the concerned baryons and then deduce the form factors which are related to two Isgur-Wise functions for the $\Sigma_{b}\to\Sigma_c$ transition under the heavy quark limit. Our numerical results indicate that $\Gamma(\Sigma_{b}\to\Sigma_c e\nu_e)$ is about $1.38\times10^{10}{\rm s}^{-1}$ and $\Gamma(\Sigma_{b}\to\Sigma_c +M)$ is slightly below $1\times10^{10}{\rm s}^{-1}$ which may be accessed at the LHCb detector. By the flavor SU(3) symmetry we estimate the rates of $\Omega_b\to\Omega_c$. We suggest to measure weak decays of $\Omega_b\to\Omega_c$, because $\Omega_b$ does not decay via strong interaction, the advantage is obvious.