https://doi.org/10.1140/epjc/s10052-021-09196-4
Letter
Establishing the first hidden-charm pentaquark with strangeness
1
School of Physics, Southeast University, 210094, Nanjing, China
2
School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China
3
School of Physical Science and Technology, Lanzhou University, 730000, Lanzhou, China
4
Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS, 730000, Lanzhou, China
5
Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, 300350, Tianjin, China
Received:
3
March
2021
Accepted:
27
April
2021
Published online:
11
May
2021
We study the 
recently observed by LHCb using the method of QCD sum rules. Our results support its interpretation as the 
hadronic molecular state of either 
or 
. Within the hadronic molecular picture, the three LHCb experiments observing 
and 
states (Aaij et al., Phys Rev Lett 115:072001, 2015; Aaij et al., Phys Rev Lett 122:222001, 2019; Aaij et al., arXiv:2012.10380 [hep-ex], 2012) can be well understood as a whole. This strongly supports the existence of hadronic molecules, whose studies can significantly improve our understanding on the construction of the subatomic world. To verify this picture, we propose to further investigate the to examine whether it can be separated into two states, and to search for the 
molecular state of 
.
© The Author(s) 2021
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