Kavli Affiliate: Jonathan Rosner
| Summary:
The new strange pentaquarks observed by LHCb are very likely hadronic molecules consisting of $Ξ_c bar D$ and $Ξ_c bar D^*.$ We discuss the experimental evidence supporting this conclusion, pointing out the similarities and differences with the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$ pentaquarks in the non-strange sector. The latter clearly are hadronic molecules consisting of $Σ_c bar D$ and $Σ_c bar D^*.$ Following this line of thought, we predict three additional strange pentaquarks, consisting of $Ξ_c^prime bar D$ and $Ξ_c^prime bar D^*.$ The masses of these states are expected to be shifted upwards by $M(Ξ_c^prime)-M(Ξ_c) approx 110$ MeV with respect to the corresponding known strange pentaquarks.
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