• Open Access

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

Ming-Zhu Liu, Ya-Wen Pan, Fang-Zheng Peng, Mario Sánchez Sánchez, Li-Sheng Geng, Atsushi Hosaka, and Manuel Pavon Valderrama
Phys. Rev. Lett. 122, 242001 – Published 21 June 2019

Abstract

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)andPc(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.

  • Received 12 April 2019
  • Revised 9 May 2019

DOI:https://doi.org/10.1103/PhysRevLett.122.242001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsNuclear Physics

Authors & Affiliations

Ming-Zhu Liu1, Ya-Wen Pan1, Fang-Zheng Peng1, Mario Sánchez Sánchez2, Li-Sheng Geng1,3,*, Atsushi Hosaka4,5,†, and Manuel Pavon Valderrama1,6,‡

  • 1School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
  • 2Centre d’Études Nucléaires, CNRS/IN2P3, Université de Bordeaux, 33175 Gradignan, France
  • 3Beijing Key Laboratory of Advanced Nuclear Materials and Physics and Beijing Advanced Innovation Center for Big Data-based Precision Medicine, Beihang University, Beijing 100191,China
  • 4Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki 567-0047, Japan
  • 5Advanced Science Research Center, Japan Atomic Energy Agency (JAEA), Tokai 319-1195, Japan
  • 6International Research Center for Nuclei and Particles in the Cosmos and Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 100191, China

  • *lisheng.geng@buaa.edu.cn
  • hosaka@rcnp.osaka-u.ac.jp
  • mpavon@buaa.edu.cn

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Issue

Vol. 122, Iss. 24 — 21 June 2019

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