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arXiv 1507.02073hep-ex
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在VEPP-2000 $e^+e^-$对撞机上寻找$η\rightarrow e^+ e^-$衰变

On a search for the $η\rightarrow e^+ e^-$ decay at the VEPP-2000 $e^+e^-$ collider

M. N. Achasov, A. Yu. Barnyakov, K. I. Beloborodov A. V. Berdyugin, A. G. Bogdanchikov, A. A. Botov, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, L. V. Kardapo… 展开作者

M. N. Achasov, A. Yu. Barnyakov, K. I. Beloborodov A. V. Berdyugin, A. G. Bogdanchikov, A. A. Botov, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, L. V. Kardapoltsev, A. G. Kharlamov, I. A. Koop, L. A. Korneev, A. A. Korol, D. P. Kovrizhin, A. S. Kupich, A. P. Lysenko, K. A. Martin, N. Yu. Muchnoi, A. E. Obrazovsky, E. V. Pakhtusova, E. A. Perevedentsev, Yu. A. Rogovsky, A. I. Senchenko, S. I. Serednyakov, Z. K. Silagadze, Yu. M. Shatunov, D. A. Shtol, D. B. Shwartz, A. N. Skrinsky, I. K. Surin, Yu. A. Tikhonov, Yu. V. Usov, A. V. Vasiljev, I. M. Zemlyansky

摘要:

本文研究了VEPP-2000 $e^+e^-$对撞机在寻找稀有衰变$η\rightarrow e^+ e^-$中的灵敏度。逆反应$e^+ e^- \rightarrow η$提出了这种搜索。我们已经分析了一个数据样本与108 nb $^{-1}$收集的SND探测器在质心能量范围520-580 MeV,并没有发现背景事件的反应$e^+ e^- \rightarrow η$在衰变模式$η\toπ^0π^0π^0$。在没有背景的情况下,$10^{-6}$对${\cal B}(η\rightarrow e^+ e^-)$的灵敏度可以在VEPP-2000操作的两周内达到。这样的灵敏度比${\cal B}(η\rightarrow e^+ e^-)$的当前上限好2.3倍。

英文摘要:

A sensitivity of the VEPP-2000 $e^+e^-$ collider in a search for the rare decay $η\rightarrow e^+ e^-$ has been studied. The inverse reaction $e^+ e^- \rightarrow η$ is proposed for this search. We have analyzed a data sample with an integrated luminosity of 108 nb$^{-1}$ collected with the SND detector in the center-of-mass energy range 520-580 MeV and found no background events for the reaction $e^+ e^- \rightarrow η$ in the decay mode $η\toπ^0π^0π^0$. In the absence of background, a sensitivity to ${\cal B}(η\rightarrow e^+ e^-)$ of $10^{-6}$ can be reached during two weeks of VEPP-2000 operation. Such a sensitivity is better than the current upper limit on ${\cal B}(η\rightarrow e^+ e^-)$ by a factor of 2.3.

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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