Precision measurement of the Branching fractions of etaprime decays

Precision measurement of the Branching fractions of etaprime decays
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精确测量 etaprime 衰变的分支分数

DOI:
10.1103/physrevlett.122.142002
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发表时间:
2019
期刊:
Physical Review Letters
影响因子:
--
通讯作者:
BESIII Collaboration M. Ablikim et al
BESIII Collaboration M. Ablikim et al
中科院分区:
其他
文献类型:
--
作者:
BESIII Collaboration M. Ablikim et al

文献摘要

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基于用BESIII探测器收集的一个样品的事件,我们提出了测量和绝对支化分数使用的过程。通过分析辐射光子转换成电子对的事件,测量到的分支分数为。首次测量了五个主要衰变道的绝对分支率,分别为:B(η′→γπ+π-)=(29.90±0.03±0.55)%,B(η′→ηπ+π-)=(41.24±0.08±1.24)%,B(η′→ηπ0π0)=(21.36±0.10±0.92)%,和。
Based on a sample ofevents collected with the BESIII detector, we present measurements ofandabsolute branching fractions using the process. By analyzing events where the radiative photon converts into anpair, the branching fraction foris measured to be. The absolute branching fractions of the five dominant decay channels of theare then measured for the first time and are determined to be B(η′→γπ+π-)=(29.90±0.03±0.55)%, B(η′→ηπ+π-)=(41.24±0.08±1.24)%, B(η′→ηπ0π0)=(21.36±0.10±0.92)%,, and, where the first uncertainties are statistical and the second systematic.