Establishing the first hidden-charm pentaquark with strangeness

• Published in: The European physical journal. C, Particles and fields Vol. 81; no. 5; pp. 1 - 9
• Main Authors: Chen, Hua-Xing, Chen, Wei, Liu, Xiang, Liu, Xiao-Hai
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.05.2021; Springer; Springer Nature B.V; SpringerOpen
• Subjects: Astronomy; Astrophysics and Cosmology; Atoms & subatomic particles; Elementary Particles; Experiments; Hadrons; Heavy Ions; Letter; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quarks; Strangeness; String Theory; Sum rules
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-021-09196-4

We study the P cs ( 4459 ) 0 recently observed by LHCb using the method of QCD sum rules. Our results support its interpretation as the D ¯ ∗ Ξ c hadronic molecular state of either J P = 1 / 2 - or 3 / 2 - . Within the hadronic molecular picture, the three LHCb experiments observing P c and P cs 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 P cs ( 4459 ) 0 to examine whether it can be separated into two states, and to search for the D ¯ Ξ c molecular state of J P = 1 / 2 - .