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

• Received 6 March 2020
• Accepted 5 June 2020

DOI:https://doi.org/10.1103/PhysRevD.102.014004

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Published by the American Physical Society