Observation of chi_c2 -> eta' eta' and chi_c0,2 -> eta eta'
Observation of chi_c2 -> eta' eta' and chi_c0,2 -> eta eta'
复制标题
观察 Ïc0 ⎆ ηηⲠ和 Ïc2 ⎆ ηηâ², ηâ²Î·â²
DOI：
10.1103/physrevd.96.112006
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发表时间：
2017
影响因子：
5
通讯作者：
B. Zheng
中科院分区：
文献类型：
--
作者：
BESIII Collaboration;B. Zheng
利用BESIII探测器在2009年和2012年收集的事件样本，我们研究了衰变和。和的衰变是首次观测到的，分别具有统计意义。其中，B(χc0→η‘η’)=(2.19±0.0 3±0.14)×10-3，B(χc2→η‘η’)=(4.76±0.5 6±0.38)×10-5，B(χc0→ηη‘)=(8.92±0.84±0.65)×10-5，B(χc2→ηη’)=(2.2 7±0.43±0.2 5)×10-5。与以前的测量相比，测量的精度有了显著的提高。根据测量的分枝分数，可以阐明Okubo-Zweig-Iizuka双不连通跃迁振幅和单Okubo-Zweig-Iizuka不连通跃迁振幅在衰变到赝标量介子对中所起的作用。
Using a sample ofevents collected with the BESIII detector in 2009 and 2012, we study the decaysand. The decays,andare observed for the first time with statistical significances of,and, respectively. The branching fractions are determined to be B(χc0→η′η′)=(2.19±0.03±0.14)×10-3, B(χc2→η′η′)=(4.76±0.56±0.38)×10-5, B(χc0→ηη′)=(8.92±0.84±0.65)×10-5 and B(χc2→ηη′)=(2.27±0.43±0.25)×10-5, where the first uncertainties are statistical and the second are systematic. The precision for the measurement ofis significantly improved compared to previous measurements. Based on the measured branching fractions, the role played by the doubly and singly Okubo-Zweig-Iizuka disconnected transition amplitudes fordecays into pseudoscalar meson pairs can be clarified.