Observation of Resonance Structures in e+e- -> pi+pi-psi2(3823) and Mass Measurement of psi2(3823)
Observation of Resonance Structures in e+e- -> pi+pi-psi2(3823) and Mass Measurement of psi2(3823)
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e e- -> pi pi-psi2(3823) 中共振结构的观察和 psi2(3823) 的质量测量
DOI：
10.1103/physrevlett.129.102003
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发表时间：
2022
影响因子：
8.6
通讯作者：
BESIII Collaboration
中科院分区：
文献类型：
--
作者：
G.R.Liao;et al.;BESIII Collaboration
利用BESIII探测器在4.23 ~ 4.70 GeV的质心能量范围内收集的积分光度数据，我们测量了横截面和分支分数的乘积。首次在横截面线形中观察到共振结构，其显著性超过。拟合数据与两个相干Breit-Wigner共振建模的相关截面产量，和。虽然数据不太支持，但与的单一共振也可以解释数据。这一观察加深了我们对类粲偶素矢量态性质的理解。状态的质量被测量为，这是迄今为止最精确的测量。
Using a data sample corresponding to an integrated luminosity ofcollected at center-of-mass energies from 4.23 to 4.70 GeV with the BESIII detector, we measure the product of thecross section and the branching fraction. For the first time, resonance structure is observed in the cross section line shape ofwith significances exceeding. A fit to data with two coherent Breit-Wigner resonances modeling the-dependent cross section yields,, and,. Though weakly disfavored by the data, a single resonance with,is also possible to interpret data. This observation deepens our understanding of the nature of the vector charmoniumlike states. The mass of thestate is measured as, which is the most precise measurement to date.