Anticharmed strange pentaquarks from the one-boson-exchange model

TL;DR

This paper predicts the existence of anticharmed strange pentaquarks as hadronic molecules using the one-boson-exchange model, suggesting experimental detection via specific decay channels.

Contribution

It introduces a novel prediction of three molecular bound states of anticharmed strange pentaquarks with specific quantum numbers and explores their resonances and decay properties.

Findings

Three molecular bound states predicted below thresholds.

Mass ordering can be altered by delta(r) term adjustments.

Decay widths and detection channels identified.

Abstract

Inspired by the LHCb's discovery of hidden-charm pentaquarks, the anticharmed strange pentaquarks $P_{\bar c s}$ 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 $J^P=1/2^-$ below the $\bar D\Sigma$ threshold and another two with $J^P=\{1/2^-,3/2^-\}$ below the $\bar D^*\Sigma$ 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 $\delta(r)$ term. Furthermore, resonances associated with these three bound states are examined by considering $ D_s^-N-\bar D\Lambda-\bar D \Sigma-\bar D^*\Lambda-\bar D^*\Sigma$ coupled-channel dynamics, and decay widths of them are predicted. Our study indicates that the $ D_s^- p$ invariant mass spectrum in the $\bar B_s^0\to \bar n D_s^- p$ decay is an appropriate place to detect the $P_{\bar c s}$ pentaquarks.