${\Omega }_c$ excited states within a ${\mathrm{SU}(6)}_{\mathrm{lsf}}\times$HQSS model

Abstract

We have reviewed the renormalization procedure used in the unitarized coupled-channel model of Phys. Rev. D85 114032 (2012), and its impact in the $C=1$, $S=-2$, and $I=0$ sector, where five ${\Omega }_c^{(\ast )}$ states have been recently observed by the LHCb Collaboration. The meson-baryon interactions used in the model are consistent with both chiral and heavy-quark spin symmetries and lead to a successful description of the observed lowest-lying odd parity resonances ${\Lambda }_c(2595)$ and ${\Lambda }_c(2625)$, and ${\Lambda }_b(5912)$ and ${\Lambda }_b(5920)$ resonances. We show that some (probably at least three) of the states observed by LHCb will also have odd parity and spins $J=1/2$ and $J=3/2$, belonging two of them to the same ${\mathrm{SU}(6)}_{\mathrm{light}-\mathrm{spin}-\mathrm{flavor}}\times$HQSS multiplets that the latter strangenessless heavy$-\Lambda$ baryons.

Comments: 11 pages, 3 figures, 6 tables, published in The European Physical Journal C