在 BESIII 实验中观测到 e+e-→π+π-γχc1 中的 ψ(1 3D2) 态。
Observation of the ψ(1 3D2) State in e+e-→π+π-γχc1 at BESIII.
机构信息
Institute of High Energy Physics, Beijing 100049, People's Republic of China.
G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia.
出版信息
Phys Rev Lett. 2015 Jul 3;115(1):011803. doi: 10.1103/PhysRevLett.115.011803. Epub 2015 Jul 1.
We report the observation of the X(3823) state in the process e+e-→π+π-X(3823)→π+π-γχc1 with a statistical significance of 6.2σ, in data samples at center-of-mass energies sqrt[s]=4.230, 4.260, 4.360, 4.420, and 4.600 GeV collected with the BESIII detector at the BEPCII electron positron collider. The measured mass of the X(3823) state is (3821.7±1.3±0.7) MeV/c2, where the first error is statistical and the second systematic, and the width is less than 16 MeV at the 90% confidence level. The products of the Born cross sections for e+e-→π+π-X(3823) and the branching ratio B[X(3823)→γχc1,c2] are also measured. These measurements are in good agreement with the assignment of the X(3823) state as the ψ(1 3D2) charmonium state.
我们报道了在 e+e-→π+π-X(3823)→π+π-γχc1 过程中观察到 X(3823)态的结果，其统计显著性为 6.2σ，数据样本取自北京正负电子对撞机上的 BESIII 探测器在质心系能量为 sqrt[s]=4.230、4.260、4.360、4.420 和 4.600 GeV 时采集的。测量到的 X(3823)态的质量为 (3821.7±1.3±0.7) MeV/c2，其中第一个误差是统计误差，第二个误差是系统误差，在 90%置信水平下，宽度小于 16 MeV。还测量了 e+e-→π+π-X(3823)的 Born 截面产物和分支比 B[X(3823)→γχc1,c2]。这些测量结果与将 X(3823)态分配为 ψ(1 3D2) 粲偶素态的结果一致。
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