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arXiv 2306.02810hep-phhep-ex
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通过η'→ππη研究η衰变的新方法

Novel approach to investigate $η$ decays via $η'\rightarrowππη$

Xiaolin Kang, Yuyao Ji, Xiaoqing Yuan, Benhou Xiang, Xiaorong Zhou, Haiping Peng, Xingtao Huang, Shuangshi Fang

AI总结:

本文提出利用J/ψ衰变中η'→ππη过程研究η稀有或禁戒衰变的新方法,通过η'的额外约束抑制本底,在超级τ-粲装置上可显著提高测量精度并有望观测η→e+e-。

摘要:

为了避免来自e+e-湮灭或J/ψ衰变中直接产生的本底事件的影响,我们提出了一种新的方法来研究η衰变,特别是其稀有或禁戒衰变,即利用在τ-粲工厂中J/ψ衰变产生的η'→ππη过程。基于对几个典型衰变道的蒙特卡罗研究,包括η→ππ、γl+l- (l=e, μ)、l+l-以及l+l-π0,利用η'提供的额外约束可以显著提高灵敏度。利用在超级τ-粲装置上积累的一万亿个J/ψ事例,η衰变研究的精度可以得到显著提升,甚至有望观测到稀有衰变η→e+e-。

英文摘要:

To avoid the impact from the background events directly from $e^+e^-$ annihilations or $J/ψ$ decays, we propose a novel approach to investigate $η$ decays, in particular for its rare or forbidden decays, by using $η^\prime\rightarrowππη$ produced in $J/ψ$ decays at the $τ-$charm factories. Based on the MC studies of a few typical decays, $η\rightarrow ππ$, $γl^+l^- (l= e, μ)$, $l^+l^-$, as well as $l^+l^-π^0$, the sensitivities could be obviously improved by taking advantage of the extra constraint of $η^\prime$. Using one trillion $J/ψ$ events accumulated at the Super $τ$-Charm facility, the precision on the investigation of $η$ decays could be improved significantly and the observation of the rare decay $η\rightarrow e^+e^-$ is even accessable.

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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