Emergence of a Complete Heavy-Quark Spin Symmetry Multiplet: Seven Molecular Pentaquarks in Light of the Latest LHCb Analysis

A recent analysis by the LHCb Collaboration suggests the existence of three narrow pentaquarklike states-the P-c(4312), P-c(4440), and P-c(4457)-instead of just one in the previous analysis [the P-c (4450)]. The closeness of the P-c(4312) to the (D) over bar Sigma(c) threshold and the P-c(4440) and P-c(4457) to the (D) over bar*Sigma(c) threshold suggests a molecular interpretation of these resonances. We show that these three pentaquarklike resonances can be naturally accommodated in a contact-range effective field theory description that incorporates heavy-quark spin symmetry. This description leads to the prediction of all the seven possible S-wave heavy antimeson-baryon molecules [that is, there should be four additional molecular pentaquarks in addition to the P-c(4312), P-c(4440), and P-c(4457)], providing the first example of a heavy-quark spin symmetry molecular multiplet that is complete. If this is confirmed, it will not only give us an impressive example of the application of heavy-quark symmetries and effective field theories in hadron physics, it will also uncover a clear and powerful ordering principle for the molecular spectrum, reminiscent of the SU(3)-flavor multiplets to which the light hadron spectrum conforms.