On ηc line shape in charmonium transitions

The line shapes to observe ηc in charmonium transitions, i.e., ψ（2S）, J/ψ→γηc, are investigated. The ηc line shapes in exclusive decays or by observing the inclusive photon spectrum are given. The sensitivities to measure the ηc resonance parameters are also evaluated. With more than two thousand ηc...

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Bibliographic Details
Published in:Chinese physics C 2009-08, Vol.33 (8), p.617-621
Main Author: 平荣刚
Format: Article
Language:English
Subjects:
不确定性
测量精度
精度测量
系统误差
衰变宽度
谐振参数
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Summary:The line shapes to observe ηc in charmonium transitions, i.e., ψ（2S）, J/ψ→γηc, are investigated. The ηc line shapes in exclusive decays or by observing the inclusive photon spectrum are given. The sensitivities to measure the ηc resonance parameters are also evaluated. With more than two thousand ηc events observed, the precision of the ηc decay width measurement will be improved by better than 3%. However, the uncertainties associated with the ηc modified line shapes will dominate the systematic errors and this will prohibit precision mass and width measurements.
ISSN:1674-1137
0254-3052
2058-6132
DOI:10.1088/1674-1137/33/8/003