Omega _c excited states within a mathrm{SU(6)}_{mathrm{lsf}}times \xa0HQSS model

Abstract

We have reviewed the renormalization procedure used in the unitarized coupled-channel model of Romanets et al. (Phys Rev D 85:114032, 2012), and its impact in the C=1, S=-,2, and I=0 sector, where five Omega _c^{(*)} 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 J=1/2 or J=3/2, belonging two of them to the same mathrm{SU(6)}_{mathrm{light}text {-}mathrm{spin}text {-}mathrm{flavor}}times HQSS multiplets as the latter charmed and beauty Lambda baryons.