Search for Vector Charmonium(-Like) States in the e+e-→ηJ/ψ Line Shape
The cross section of e+e-→ηJ/ψ has been measured by BESIII and Belle experiments. Fit to the e+e-→ηJ/ψ line shape, the resonant structures are evident. The parameters for the three resonant structures are M1=(3980±17±7) MeV/c2, Γ1=(104±32±13) MeV; M2=(4219±5±4) MeV/c2, Γ2=(63±9±3) MeV; and M3=(4401±...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2018-01-01
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| Series: | Advances in High Energy Physics |
| Online Access: | http://dx.doi.org/10.1155/2018/5407672 |
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| Summary: | The cross section of e+e-→ηJ/ψ has been measured by BESIII and Belle experiments. Fit to the e+e-→ηJ/ψ line shape, the resonant structures are evident. The parameters for the three resonant structures are M1=(3980±17±7) MeV/c2, Γ1=(104±32±13) MeV; M2=(4219±5±4) MeV/c2, Γ2=(63±9±3) MeV; and M3=(4401±12±4) MeV/c2, Γ3=(49±19±4) MeV, where the first uncertainties are statistical and the second are systematic. We attribute the three structures to ψ(4040), Y(4220), and ψ(4415) states. The branching fractions B(ψ(4040)→ηJ/ψ) and B(ψ(4415)→ηJ/ψ) are given. If Y(4220) is taken as ψ(4S) state, the branching fraction B(ψ(4S)→ηJ/ψ) is also given. Combining all Y(4220) parameters obtained from different decays, we give average parameters for Y(4220), which are MY(4220)=(4220.8±2.4) MeV/c2, ΓY(4220)=(54.8±3.3) MeV. |
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| ISSN: | 1687-7357 1687-7365 |