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arXiv · 1606.06148

LHCb pentaquarks in constituent quark models

P. G. Ortega·D. R. Entem·F. Fernández
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Abstract

The recently discovered $P_c(4380)^+$ and $P_c(4450)^+$ states at LHCb have masses close to the $\bar DΣ_c^*$ and $\bar D^*Σ_c$ thresholds, respectively, which suggest that they may have significant meson-baryon molecular components. We analyze these states in the framework of a constituent quark model which has been applied to a wide range of hadronic observables, being the model parameters, therefore, completely constrained. The $P_c(4380)^+$ and $P_c(4450)^+$ are studied as molecular states composed by charmed baryons and open charm mesons. Several bound states with the proper binding energy are found in the $\bar DΣ_c^*$ and $\bar D^*Σ_c$ channels. We discuss the possible assignments of these states from their decay widths. Moreover, two more states are predicted, associated with the $\bar DΣ_c$ and $\bar D^* Σ_c^*$ thresholds.

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P. G. Ortega, D. R. Entem, F. Fernández. 2016-06-20. LHCb pentaquarks in constituent quark models. https://doi.org/10.1016/j.physletb.2016.11.008

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