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《中国物理C》 2016-01
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Search for ψ(4S) → ηJ/ψ in B~±→ ηJ/ψK~± and e~+e~-→ ηJ/ψ processes

Xu-yang Gao;Xiao-long Wang;Cheng-ping Shen;School of Physics and Nuclear Energy Engineering, Beihang University;Institute of High Energy Physics, Chinese Academy of Sciences;CNP, Virginia Polytechnic Institute and State University;  
We search for the ψ(4S) state in the B~±→ηJ/ψK~± and e~+e~-→ηJ/ψ processes based on the Belle measurements with the assumed mass M =(4230±8) MeV/c~2 and width Γ =(38±12) MeV. No significant signal is observed in the ηJ/ψ mass spectra. The 90% confidence level upper limit on the product branching fraction B(B~±→ψ(4S)K~±)B(ψ(4S)→ηJ/ψ) 6.8×10~(-6) is obtained in the B~±→ηJ/ψK~± decays. By assuming the partial width of ψ(4S)→e~+e~-to be 0.63 ke V, a branching fraction limitB(ψ(4S)→ηJ/ψ) 1.3% is obtained at the 90%confidence level in e~+e~-→ηJ/ψ, which is consistent with the theoretical prediction.
【Fund】: Supported by Fundamental Research Funds for the Central Universities(YWF-14-WLXY-013);; National Natural Science Foundation of China(11575017);; CAS Center for Excellence in Particle Physics(China)
【CateGory Index】: O572.33
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