Heavy baryon spectrum with chiral multiplets of scalar and vector diquarks

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), S-Q, Xi(('))(Q), 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 3) are different from those of.Q, because of the inverse hierarchy of the pseudoscalar diquark. On the other hand, Sigma(Q),.Xi(('))(Q),Omega(Q), 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.

Automated summary

Chiral effective theory of scalar and vector diquarks based on the linear sigma model is formulated to describe ground and excited states of heavy baryons with charm or bottom quarks. By constructing a heavy-quark-diquark model and obtaining spectra of Lambda(Q), S-Q, Xi(('))(Q), and Omega(Q), the study compares the negative parity excited states of Xi(Q) (flavor 3) with those of.Q and finds differences due to the inverse hierarchy of the pseudoscalar diquark. The results are compared with experimental data and quark model.