首页|Interpretation of the η1(1855)as a K(K)1(1400)+c.c.molecule

Interpretation of the η1(1855)as a K(K)1(1400)+c.c.molecule

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An exotic state with JPC=1-+,denoted by η1(1855),was observed by BESIII Collaboration recently in J/ψ → γηη'.The fact that its mass is just below the threshold of K(K)1(1400)stimulates us to investigate whether this exotic state can be interpreted as a K(K)1(1400)+c.c.molecule or not.Using the one boson exchange model,we show that it is possible for K(K)1(1400)with JPC=1-+to bind together by taking the momentum cutoff A(≥)2 GeV and yield the same binding energy as the experimental value when A ≈ 2.5 GeV.In this molecular picture,the predicted branch ratio Br(η1(1855)→ηη')≈ 15％is consistent with the experimental results,which again supports the molecular explanation of η1(1855).Relevant systems,namely K(K)1(1400)with JPC=1--and K(K)1(1270)with JPC=1-±,are also investigated,some of which can be searched for in the future experiments.

hadronic moleculeexotic hadronsone boson exchange

Xiang-Kun Dong、Yong-Hui Lin、Bing-Song Zou

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CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China

School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

Helmholtz-Institut für Strahlen-und Kernphysik and Bethe Center for Theoretical Physics,Universit?t Bonn,Bonn D-53115,Germany

School of Physics,Central South University,Changsha 410083,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaDeutsche Forschungsgemeinschaft(DFG,German Research Founda-tion)Sino German Collaborative Research Center TRR110 Symmetries and the Emergence of Structure in QCD,and the Chinese Academy of

120701310011183501512047503196253076-TRR 110XDB34030000

2022

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCDCSCDSCI
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2022.65(6)
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