New strange pentaquarks

Abstract

The new strange pentaquarks observed by LHCb are very likely hadronic molecules consisting of ${\Xi }_c\bar{D}$ and ${\Xi }_c{\bar{D}}^{\ast }.$ 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 ${\Sigma }_c\bar{D}$ and ${\Sigma }_c{\bar{D}}^{\ast }.$ Following this line of thought, we predict three additional strange pentaquarks, consisting of ${\Xi }_c^{\prime }\bar{D}$ and ${\Xi }_c^{\prime }{\bar{D}}^{\ast }.$ The masses of these states are expected to be shifted upwards by $M({\Xi }_c^{\prime })-M({\Xi }_c)\approx 110$ MeV with respect to the corresponding known strange pentaquarks.

6 pages, 1 figure

References in corpus (5)

• Observation of a narrow pentaquark state, $P_c(4312{)}^{+}$, and of two-peak structure of the $P_c(4450{)}^{+}$
• Prediction of narrow $N^{\ast }$ and ${\Lambda }^{\ast }$ resonances with hidden charm above 4 GeV
• A survey of heavy-heavy hadronic molecules
• Spectrum of the strange hidden charm molecular pentaquarks in chiral effective field theory
• Molecular nature of $P_{cs}(4459)$ and its heavy quark spin partners

Cited by in corpus (2)

• What can we learn from the electromagnetic properties of hidden-charm molecular pentaquarks with single strangeness?
• Emergence of molecular-type characteristic spectrum of hidden-charm pentaquark with strangeness embodied in the $P_{\psi s}^{\Lambda }(4338)$ and $P_{cs}(4459)$