Spectrum of singly heavy baryons from a chiral effective theory of diquarks

Abstract

The mass spectra of singly charmed and bottom baryons, ${\mathrm{\ensuremath{\Lambda}}}_{c/b}(1/{2}^{\ifmmode\pm\else\textpm\fi{}},3/{2}^{\ensuremath{-}})$ and ${\mathrm{\ensuremath{\Xi}}}_{c/b}(1/{2}^{\ifmmode\pm\else\textpm\fi{}},3/{2}^{\ensuremath{-}})$, are investigated using a nonrelativistic potential model with a heavy quark and a light diquark. The masses of the scalar and pseudoscalar diquarks are taken from a chiral effective theory. The effect of ${U}_{A}(1)$ anomaly induces an inverse hierarchy between the masses of strange and nonstrange pseudoscalar diquarks, which leads to a similar inverse mass ordering in $\ensuremath{\rho}$-mode excitations of singly heavy baryons.

Topics & Concepts