Constructing J/ψ family with updated data of charmoniumlike Y states

Wang, Jun-Zhang (School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China) (Research Center for Hadron and CSR Physics, Lanzhou University & Institute of Modern Physics of CAS, Lanzhou 730000, China) ; Chen, Dian-Yong (School of Physics, Southeast University, Nanjing 211189, China) ; Liu, Xiang (School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China) (Research Center for Hadron and CSR Physics, Lanzhou University & Institute of Modern Physics of CAS, Lanzhou 730000, China) ; Matsuki, Takayuki (Tokyo Kasei University, 1-18-1 Kaga, Itabashi, Tokyo 173-8602, Japan) (Theoretical Research Division, Nishina Center, RIKEN, Wako, Saitama 351-0198, Japan)

05 June 2019

Abstract: Based on the updated data of charmoniumlike state Y(4220) reported in the hidden-charm channels of the e+e annihilation, we propose a 4S-3D mixing scheme to categorize Y(4220) into the J/ψ family. We find that the present experimental data can support this charmonium assignment to Y(4220). Thus, Y(4220) plays a role of a scaling point in constructing higher charmonia above 4 GeV. To further test this scenario, we provide more abundant information on the decay properties of Y(4220), and predict its charmonium partner ψ(4380), whose evidence is found by analyzing the e+eψ(3686)π+π data from BESIII. If Y(4220) is indeed a charmonium, we must face how to settle the established charmonium ψ(4415) in the J/ψ family. In this work, we may introduce a 5S-4D mixing scheme, and obtain the information of the resonance parameters and partial open-charm decay widths of ψ(4415), which do not contradict the present experimental data. Additionally, we predict a charmonium partner ψ(4500) of ψ(4415), which can be accessible at future experiments, especially, BESIII and BelleII. The studies presented in this work provide new insights to establish the higher charmonium spectrum.


Published in: Physical Review D 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevD.99.114003
License: CC-BY-4.0



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