粲夸克偶素物理实验研究新结果
RECENT PROGRESS IN EXPERIMENTAL STUDIES OF CHARMONIUM PHYSICS
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摘要: 北京谱仪合作组利用其在北京正负电子对撞机上采集的ψ(2S)大数据样本,通过ψ(2S)的辐射跃迁及强子跃迁过程,开展了粲偶素物理的广泛研究.测量了χc0、,χc1、,χc2、,ηc和J/ψ粒子的有关性质,寻找了ηc(2S)和hc(1P)粒子.在一系列重要结果中有:χc0粒子的宽度与质量、ηc粒子的质量、J/ψ的轻子衰变分支比的精确测量结果以及χc0、χc1、χc2的许多衰变道的首次测量结果.Abstract: Using a large sample of ψ(2S) events,intensive studies of various charmonium states have been performed on the Beijing Spectrometer at the Beijing Electron-Positron Collider via radiative and hadronic transitions from the ψ(2S).Among the important results are:new measurements of the total width and mass of χc0,a new measurement of the mass of ηc,precision measurements of leptonic branching fractions of J/ψ,and first measurements of numerous branching fractions of hadronic decays of χc0,χc1 and χc2.
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