Towards Exotic Hidden-Charm Pentaquarks in QCD

Hua-Xing Chen, Wei Chen, Xiang Liu, T. G. Steele, and Shi-Lin Zhu

Phys. Rev. Lett. 115, 172001 – Published 20 October 2015

Abstract

Inspired by $P_{c} (4380)$ and $P_{c} (4450)$ recently observed by LHCb, a QCD sum rule investigation is performed, by which they can be identified as exotic hidden-charm pentaquarks composed of an anticharmed meson and a charmed baryon. Our results suggest that $P_{c} (4380)$ and $P_{c} (4450)$ have quantum numbers $J^{P} = 3 / 2^{-}$ and $5 / 2^{+}$ , respectively. Furthermore, two extra hidden-charm pentaqurks with configurations $\bar{D} Σ_{c}^{*}$ and ${\bar{D}}^{*} Σ_{c}^{*}$ are predicted, which have spin-parity quantum numbers $J^{P} = 3 / 2^{-}$ and $J^{P} = 5 / 2^{+}$ , respectively. As an important extension, the mass predictions of hidden-bottom pentaquarks are also given. Searches for these partners of $P_{c} (4380)$ and $P_{c} (4450)$ are especially accessible at future experiments like LHCb and BelleII.

Received 24 July 2015

DOI:https://doi.org/10.1103/PhysRevLett.115.172001

Authors & Affiliations

Hua-Xing Chen¹, Wei Chen^2,*, Xiang Liu^3,4,†, T. G. Steele^2,‡, and Shi-Lin Zhu^5,6,7,§

¹School of Physics and Nuclear Energy Engineering and International Research Center for Nuclei and Particles in the Cosmos, Beihang University, Beijing 100191, China
²Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
³School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
⁴Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS, Lanzhou 730000, China
⁵School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
⁶Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
⁷Center of High Energy Physics, Peking University, Beijing 100871, China

^*wec053@mail.usask.ca
^†xiangliu@lzu.edu.cn
^‡tom.steele@usask.ca
^§zhusl@pku.edu.cn

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Vol. 115, Iss. 17 — 23 October 2015

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