$P_c$ pentaquarks with chiral tensor and quark dynamics

We investigate the hidden-charm pentaquarks as superpositions of ΛcD¯(*) and Σc(*)D¯(*) (isospin I=1/2) meson-baryon channels coupled to a uudcc¯ compact core by employing an interaction satisfying the heavy quark and chiral symmetries. Our model can consistently explain the masses and decay widths of Pc+(4312), Pc+(4440) and Pc+(4457) with the dominant components of ΣcD¯ and ΣcD¯* with spin-parity assignments JP=1/2-, 3/2- and 1/2-, respectively. We analyze basic properties of the Pc’s such as masses and decay widths, and find that the mass ordering is dominantly determined by the quark dynamics while the decay widths by the tensor force of the one-pion exchange.