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

Abstract

The mass spectra of singly charmed and bottom baryons, ${\Lambda }_{c/b}(1/2^{\pm },3/2^{-})$ and ${\Xi }_{c/b}(1/2^{\pm },3/2^{-})$, 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 non-strange pseudoscalar diquarks, which leads to a similar inverse mass ordering in $\rho$-mode excitations of singly heavy baryons.

Comments: 10 pages, 2 figures, 3 tables; published version