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arXiv 1209.4813hep-ex
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来自BESIII的最新结果

Recent Results from BESIII

Guangshun Huang

摘要:

BESIII是中国北京高能物理研究所升级的BEPCII双环$\ee$对撞机上的一个新的最先进的4 $π$探测器。它自2008年开始运行,收集了世界上最大的$\jpsi$、$\psip$和$ψ(3770)$衰变数据样本,以及$τ$质量扫描和低能点用于$R$测量。这些数据正被用于进行各种有趣和独特的研究,包括光强子光谱学、精确的粲偶素物理学、$D$介子衰变的高统计测量、$τ$质量测量和$R$测量。本报告中总结的结果包括观测到的$\jp\toγp\bar{p}$中的亚阈$p\bar{p}$共振、$η(1405)\rt\piz\fzero$衰变中的大的同位旋破坏、$\jpsi\rtγωϕ$中的近阈增强和$\psip\rtγη_c(2S)$的M1跃迁、$\jpsi$和$\psip$衰变中的$ρπ$之谜、最近对$\ec$和$\hc$线型的精确测量;以及$D$介子(半)轻子衰变和$τ$质量测量的初步结果。

英文摘要:

BESIII is a new state-of-the-art 4$π$ detector at the upgraded BEPCII two-ring $\ee$ collider at the Institute of High Energy Physics in Beijing, China. It has been in operation since 2008, and has collected the world's largest data samples of $\jpsi$, $\psip$ and $ψ(3770)$ decays, as well as $τ$ mass scan and low energy points for $R$ measurement. These data are being used to make a variety of interesting and unique studies of light-hadron spectroscopy, precision charmonium physics, high-statistics measurements of $D$ meson decays, $τ$ mass measurement and $R$ measurement. Results summarized in this report include observations of a subthreshold $p\bar{p}$ resonance in $\jp\toγp\bar{p}$, a large isospin-violation in $η(1405)\rt\piz\fzero$ decays, a near-threshold enhancement in $\jpsi\rtγωϕ$, and a M1 transition $\psip\rtγη_c(2S)$; the $ρπ$ puzzle in $\jpsi$ and $\psip$ decays; some recent precision measurements of $\ec$ and $\hc$ lineshapes; and preliminary results of the $D$ meson (semi-)leptonic decays and the $τ$ mass measurement.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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