摘要
Inspired by the recent measurement of the process e+e-→∧■,we calculate the mass spectrum of the 0 meson with the GI model.For the excited vector strangeonium states ?（3 S,4 S,5 S,6 S） and ?（2 D,3 D,4 D,5 D）,we investigate the electronic decay width with the Van Royen-Weisskopf formula,and the partial widths of the ∧■,■,and■ decay modes with the extended quark-pair creation model.We find that the electronic decay width of the D-wave vector strangeonium is about 3～8 times larger than of the S-wave vector strangeonium.Around 2232 Me V,the partial decay width of the ∧■ mode can be up to several MeV for ?（33 S1）,while the partial ∧■ decay width of ?（23 D1） is O(10-3) keV.If the threshold enhancement reported by the BESIII collaboration arises from the strangeonium meson,this state is very likely the ?（33 S1） state.We also note that the ∧■ and∑+■partial decay widths of the states ?（33 D1） and ?（43 S1） are several MeV,which is sufficient to be observed in future experiments.
Inspired by the recent measurement of the process e^+e^-→ΛΛ^-,we calculate the mass spectrum of the Φ meson with the GI model.For the excited vector strangeonium states Φ(3S,4S,5S,6S)and Φ(2D,3D,4D,5D),we investigate the electronic decay width with the Van Royen-Weisskopf formula,and the partial widths of theΛΛ^-,■^-(*)■^-+,and Σ+(*)Σ^- -(*)decay modes with the extended quark-pair creation model.We find that the electronic decay width of the D-wave vector strangeonium is about 3~8 times larger than of the S-wave vector strangeonium.Around 2232 MeV,the partial decay width of theΛΛ^-mode can be up to several MeV for Φ(33S1),while the partialΛΛ^-decay width of Φ(23D1)is O(10^-3)keV.If the threshold enhancement reported by the BESIII collaboration arises from the strangeonium meson,this state is very likely the?(33S1)state.We also note that theΛΛ^- and Σ+Σ^--partial decay widths of the states Φ(33D1)and Φ(43S1)are several MeV,which is sufficient to be observed in future experiments.
作者
Li-Ye Xiao
Xin-Zhen Weng
Xian-Hui Zhong
Shi-Lin Zhu
肖立叶;翁新震;钟显辉;朱世琳(School of Physics and State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China;Center of High Energy Physics,Peking University,Beijing 100871,China;Department of Physics,Hunan Normal University,and Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education,Changsha 410081,China;Synergetic Innovation Center for Quantum Effects and Applications(SICQEA),Hunan Normal University,Changsha 410081,China;Collaborative Innovation Center of Quantum Matter,Beijing 100871,China)
基金
Supported by the National Natural Science Foundation of China(11575008,11621131001,11775078,U1832173)
National Key Basic Research Program of China(2015CB856700)
In part supported by China Postdoctoral Science Foundation(2017M620492)
