<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>P</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math> pentaquarks with chiral tensor and quark dynamics
Yasuhiro Yamaguchi, H. García-Tecocoatzi, Alessandro Giachino, Atsushi Hosaka, E. Santopinto, S. Takeuchi, M. Takizawa
Abstract
We investigate the hidden-charm pentaquarks as superpositions of ${\mathrm{\ensuremath{\Lambda}}}_{c}{\overline{D}}^{(*)}$ and ${\mathrm{\ensuremath{\Sigma}}}_{c}^{(*)}{\overline{D}}^{(*)}$ (isospin $I=1/2$) meson-baryon channels coupled to a $uudc\overline{c}$ compact core by employing an interaction satisfying the heavy quark and chiral symmetries. Our model can consistently explain the masses and decay widths of ${P}_{c}^{+}(4312)$, ${P}_{c}^{+}(4440)$ and ${P}_{c}^{+}(4457)$ with the dominant components of ${\mathrm{\ensuremath{\Sigma}}}_{c}\overline{D}$ and ${\mathrm{\ensuremath{\Sigma}}}_{c}{\overline{D}}^{*}$ with spin-parity assignments ${J}^{P}=1/{2}^{\ensuremath{-}}$, $3/{2}^{\ensuremath{-}}$ and $1/{2}^{\ensuremath{-}}$, respectively. We analyze basic properties of the ${P}_{c}$'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.