Anticharmed strange pentaquarks from the one-boson-exchange model

Abstract

Inspired by the LHCb's discovery of hidden-charm pentaquarks, the anticharmed strange pentaquarks ${P}_{\overline{c}s}$ in a favor of the hadronic molecule picture are investigated from the one-boson-exchange model. Similar to the hidden-charm pentaquarks, three molecular bound states, one with spin parity ${J}^{P}=1/{2}^{\ensuremath{-}}$ below the $\overline{D}\mathrm{\ensuremath{\Sigma}}$ threshold and another two with ${J}^{P}={1/{2}^{\ensuremath{-}},3/{2}^{\ensuremath{-}}}$ below the ${\overline{D}}^{*}\mathrm{\ensuremath{\Sigma}}$ threshold, are predicted at 3--3.2 GeV mass region. The mass ordering of the later two states can be interchanged by different reductions of the $\ensuremath{\delta}(\mathbit{r})$ term. Furthermore, resonances associated with these three bound states are examined by considering ${D}_{s}^{\ensuremath{-}}N\ensuremath{-}\overline{D}\mathrm{\ensuremath{\Lambda}}\ensuremath{-}\overline{D}\mathrm{\ensuremath{\Sigma}}\ensuremath{-}{\overline{D}}^{*}\mathrm{\ensuremath{\Lambda}}\ensuremath{-}{\overline{D}}^{*}\mathrm{\ensuremath{\Sigma}}$ coupled-channel dynamics, and decay widths of them are predicted. Our study indicates that the ${D}_{s}^{\ensuremath{-}}p$ invariant mass spectrum in the ${\overline{B}}_{s}^{0}\ensuremath{\rightarrow}\overline{n}{D}_{s}^{\ensuremath{-}}p$ decay is an appropriate place to detect the ${P}_{\overline{c}s}$ pentaquarks.

Topics & Concepts