LIU, Ming-Zhu; PAN, Ya-Wen; PENG, Fang-Zheng; SÁNCHEZ SÁNCHEZ, Mario; GENG, Li-Sheng; HOSAKA, Atsushi; PAVON VALDERRAMA, Manuel

doi:10.1103/PhysRevLett.122.242001

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Phys.Rev.Lett.. 2019, vol. 122, n° 24, p. 242001

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A recent analysis by the LHCb Collaboration suggests the existence of three narrow pentaquarklike states—the Pc(4312), Pc(4440), and Pc(4457)—instead of just one in the previous analysis [the Pc(4450)]. The closeness of the Pc(4312) to the D¯Σc threshold and the Pc(4440) and Pc(4457) to the D¯*Σc 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 Pc(4312), Pc(4440), and Pc(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.< Réduire

Mots clés en anglais

Elementary Particles and Fields

pentaquark

heavy quark: symmetry

heavy quark: spin

spin: symmetry

effective field theory

LHC-B

numerical calculations

new physics

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Emergence of a complete heavy-quark spin symmetry multiplet: seven molecular pentaquarks in light of the latest LHCb analysis

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