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arXiv 2109.03364hep-ex
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在$Υ(3S)\rightarrow e^{\pm}μ^{\mp}$中寻找轻子味破坏

Search for Lepton Flavor Violation in $Υ(3S)\rightarrow e^{\pm}μ^{\mp}$

BABAR Collaboration

摘要:

本文首次研究了$b$ ~夸克和$b$ ~反夸克束缚态衰变中的电子-μ子轻子味破坏(LFV)。我们在质心能量为10.36 GeV的SLAC PEP-Ⅱ $e^+e^-$对撞机上用\babar \探测器收集的27 fb $^{-1}$数据中,在1.18亿$Υ(3S)$介子的样品中寻找LFV衰变$Υ(3S)\rightarrow e^{\pm}μ^{\mp}$.没有发现信号的证据,我们对分支分数$\mathcal{B}(Υ(3S)\rightarrow e^{\pm}μ^{\mp})<3.6\times10^{-7}\mathrm{at~ 90\%~ CL}$设定了限制。这个结果可以解释为能量标度$Λ_{NP}$上的极限$Λ_{NP}/g^2_{NP} > 80~$ TeV除以相关新物理的耦合平方$g^2_{NP}$。

英文摘要:

We report on the first search for electron-muon lepton flavor violation (LFV) in the decay of a $b$~quark and $b$~antiquark bound state. We look for the LFV decay $Υ(3S)\rightarrow e^{\pm}μ^{\mp}$ in a sample of 118~million $Υ(3S)$ mesons from 27~fb$^{-1}$ of data collected with the \babar\ detector at the SLAC PEP-II $e^+e^-$ collider operating with a 10.36~GeV center-of-mass energy. No evidence for a signal is found and we set a limit on the branching fraction $\mathcal{B}(Υ(3S)\rightarrow e^{\pm}μ^{\mp})<3.6\times10^{-7}\mathrm{at~ 90\%~ CL}$. This result can be interpreted as a limit $Λ_{NP}/g^2_{NP} > 80~$TeV on the energy scale $Λ_{NP}$ divided by the coupling-squared $g^2_{NP}$ of relevant new physics.

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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