Heavy baryon spectrum with chiral multiplets of scalar and vector diquarks

Abstract

Chiral effective theory of scalar and vector diquarks is formulated according to the linear sigma model. The main application is to describe the ground and excited states of singly heavy baryons with a charm or bottom quark. Applying the potential quark model between the diquark and the heavy quark ($Q=c,b$), we construct a heavy-quark--diquark model. The spectra of the positive- and negative-parity states of ${\Lambda }_Q$, ${\Sigma }_Q$, ${\Xi }_Q^{{(}^{\prime })}$ and ${\Omega }_Q$ are obtained. The masses and interaction parameters of the effective theory are fixed partly from the lattice QCD data and also from fitting low-lying heavy baryon masses. We find that the negative parity excited states of ${\Xi }_Q$ (flavor $\bar{3}$) are different from those of ${\Lambda }_Q$, because of the inverse hierarchy of the pseudoscalar diquark. On the other hand, ${\Sigma }_Q,{\Xi }_Q^{\prime }$ and ${\Omega }_Q$ (flavor $6$) baryons have similar spectra. We compare our results of the heavy-quark--diquark model with experimental data as well as the quark model.

19 pages, 10 figures

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Cited by in corpus (18)

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• Observation of new baryons in the ${\Xi }_b^{-}{\pi }^{+}{\pi }^{-}$ and ${\Xi }_b^0{\pi }^{+}{\pi }^{-}$ systems
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• Identifying the ${\Xi }_b(6100)$ as the $P$-wave bottom baryon of $J^P=3/2^{-}$
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• Axial anomaly effect to the chiral-partner structure of diquarks at high temperature
• Hunting for the prospective $T_{cc}$ family based on the diquark-antidiquark configuration
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• Fate of ${\Sigma }_c$, ${\Xi }_c^{\prime }$ and ${\Omega }_c$ baryons at high temperature with chiral restoration
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• Chiral effective theory of scalar and vector diquarks revisited
• Probing the inner structures of the observed ${\Xi }_b$ and ${\Xi }_b^{\prime }$ resonances
• Electromagnetic probes revealing the inner structure of the ${\Lambda }_c(2940)$