Spectroscopy and decay properties of ${\mathrm{\Sigma }}_b,{\mathrm{\Lambda }}_b$ baryons in quark-diquark model

Properties of single beauty baryons (${\mathrm{\Sigma }}_b,{\mathrm{\Lambda }}_b$) are studied based on the quark-diquark structure. The confinement potential is assumed as two body colour coulomb plus power potential with exponent $\nu$. We find a strong correlation between the choice of the heavy quark mass parameter ($m_b$), strong coupling constant (${\alpha }_s$) and the potential exponent ($\nu$) for getting the experimental mass spilt of $m_{\Sigma^{*}{b}}- m{\Sigma_{b}}=21.2\pm2.0 $ MeV. The resultant spectroscopic parameters are used for computing magnetic moments, the electromagnetic radiative decay, strong hadronic decay and semileptonic decay widths of $\Sigma_{b}, \Lambda_{b}$ systems. Our predictions on the radiative decay width correspond to ${\mathrm{\Sigma }}_b^{\ast 0}\to {\mathrm{\Lambda }}_b\gamma$ are in agreement with the QCD sum rule prediction. The present results on the semileptonic decay widths of ${\mathrm{\Lambda }}_b\to {\mathrm{\Lambda }}_{c}l{\nu }_l$ (2.50-4.73) $\ast {10}^{10}{s}^{-1}$ are in agreement with the experimental value of $3.59^{+1.234}_{-0.936} *10^{10} s^{-1}$ reported by (PDG 2010).