New puzzle in charmonium decays
New puzzle in charmonium decays
复制标题
魅魔的新谜题正在衰变
DOI：
10.1088/1674-1137/ac5fa2
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发表时间：
2021
影响因子：
3.6
通讯作者：
Changzheng Yuan
中科院分区：
文献类型：
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作者：
Hongpeng Wang;Changzheng Yuan
通过分析粲偶素赝标衰变的现有数据，我们得到了$\eta_c '$和$\eta_c$衰变到轻强子的十种不同末态的分支比.我们首次检验了这两种衰变的现有理论预言，发现实验数据与它们有显著的差异。在$\eta_c '$中没有观察到任何比$\eta_c$衰变速率更高的衰变模式，这表明在赝标量粲偶素衰变中存在非常不寻常的衰变动力学。我们还报告了$\eta_c '\to \gamma\gamma$（$2.21_{-0.64}^{+0.88}$~keV）的部分宽度的第一个模型独立评估和$\eta_c\to \gamma\gamma$（$5.43_{-0.38}^{+0.41}$~keV）的改进确定。后者与最近的格点QCD计算显示出张力。本作品的内容可以在知识共享署名3.0许可协议的条款下使用。本作品的任何进一步分发都必须保留作者和作品标题、期刊引用和DOI的归属。文章由SCOAP 3资助，由中国物理学会、中国科学院高能物理研究所、中国科学院近代物理研究所和IOP出版有限公司授权出版。
By analyzing existing data on pseudoscalar charmonium decays, we obtain the ratio of the branching fractions of $\eta_c'$ and $\eta_c$ decays into ten different final states with light hadrons. For the first time, we test the two existing theoretical predictions of these decays, and find that the experimental data are significantly different from both of them. The lack of observation of any decay mode with higher rate in $\eta_c'$ than in $\eta_c$ decays suggests very unusual decay dynamics in pseudoscalar charmonium decays to be identified. We also report the first model-independent evaluation of the partial width of $\eta_c'\to \gamma\gamma$ ($2.21_{-0.64}^{+0.88}$~keV) and improved determination of that of $\eta_c\to \gamma\gamma$ ($5.43_{-0.38}^{+0.41}$~keV). The latter shows a tension with the most recent lattice QCD calculation. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
DOI：
10.1136/ebmh.11.4.102
发表时间：
2008-10
期刊：
Evidence Based Mental Health
影响因子：
--
作者：
P. Cochat;L. Vaucoret;J. Sarles
通讯作者：
P. Cochat;L. Vaucoret;J. Sarles