${\Sigma }_b\to {\Sigma }_c$ and ${\Omega }_b\to {\Omega }_c$ weak decays in the light-front quark model

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 $1.38\times 10^{10}{\mathrm{s}}^{-1}$ and $\Gamma ({\Sigma }_b\to {\Sigma }_c+M)$ is slightly below $1\times 10^{10}{\mathrm{s}}^{-1}$ 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.

17 pages 3 figures. To avoid overlap with our previous work, we have deleted most repeated and unnecessary parts. The whole version is re-written

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