Towards Exotic Hidden-Charm Pentaquarks in QCD

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 (D) over bar Sigma(c)* and (D) over bar*Sigma(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.National Natural Science Foundation of China [11205011, 11475015, 11375024, 11222547, 11175073, 11261130311]; Ministry of Education of China (SRFDP) [20120211110002]; Ministry of Education of China (Fundamental Research Funds for the Central Universities); Natural Sciences and Engineering Research Council of Canada (NSERC)SCI(E)EIPubMedARTICLEwec053@mail.usask.ca; xiangliu@lzu.edu.cn; tom.steele@usask.ca; zhusl@pku.edu.cn1717200111