N and $Δ$ hidden-charm resonances with heavy-quark spin symmetry

Abstract

We study N and $Δ$ hidden-charm baryon resonances that are generated dynamically from the s-wave interaction of pseudoscalar and vector mesons with $1/2^+$ and $3/2^+$ baryons. We use a unitary coupled-channels model that fulfills heavy-quark spin symmetry and respects spin-flavor symmetry in the light sector. We predict seven N-like and five $Δ$-like states with masses around 4 GeV, most of them as bound states. Some of these states form heavy-quark spin multiplets, which are almost degenerate in mass.

4 pages; proceedings of The 9th International Workshop on the Physics of Excited Nucleons (NSTAR 2013), Peniscola, Spain, May 27-30, 2013