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arXiv 2006.14710hep-ex
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KLOE实验中$η\toπ^{+}π^{-}$分支分数的上限

Upper limit on the $η\toπ^{+}π^{-}$ branching fraction with the KLOE experiment

D. Babusci, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D'Agostini, E. Danè… 展开作者

D. Babusci, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D'Agostini, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, D. Domenici, A. D'Uffizi, A. Fantini, P. Fermani, S. Fiore, A. Gajos, P. Gauzzi, S. Giovannella, E. Graziani, V. L. Ivanov, T. Johansson, X. Kang, D. Kisielewska-Kamińska, E. A. Kozyrev, W. Krzemien, A. Kupsc, P. A. Lukin, G. Mandaglio, M. Martini, R. Messi, S. Miscetti, D. Moricciani, P. Moskal, S. Parzych, A. Passeri, V. Patera, E. Perez del Rio, P. Santangelo, M. Schioppa, A. Selce, M. Silarski, F. Sirghi, E. P. Solodov, L. Tortora, G. Venanzoni, W. Wiślicki, M. Wolke

摘要:

基于Fraascati $ϕ$工厂DAPDMATHABMONE的KLOE探测器收集的1.61 fb $e^+e^-$碰撞数据的积分光度,对$P$ -和$CP$ -违反衰变$η\toπ^{+}π^{-}$进行了搜索.辐射$ϕ\toηγ$衰变被用来接近$η$介子。在$π^{+}π^{-}$不变质谱中未观察到信号,并且在90\%置信水平下确定分支分数的上限为${\mathcal B}(η\toπ^{+}π^{-})<4.9\times10^{-6}$,其比先前的KLOE结果小约三倍。从这两个测量的组合,我们得到${\mathcal B}(η\toπ^{+}π^{-}) < 4.4\times10^{-6}$在90\%的置信水平。

英文摘要:

Based on an integrated luminosity of 1.61 fb$^{-1}$ $e^+e^-$ collision data collected with the KLOE detector at DA$Φ$NE, the Frascati $ϕ$-factory, a search for the $P$- and $CP$-violating decay $η\toπ^{+}π^{-}$ has been performed. Radiative $ϕ\toηγ$ decay is exploited to access the $η$ mesons. No signal is observed in the $π^{+}π^{-}$ invariant mass spectrum, and the upper limit on the branching fraction at 90\% confidence level is determined to be ${\mathcal B}(η\toπ^{+}π^{-})<4.9\times10^{-6}$, which is approximately three times smaller than the previous KLOE result. From the combination of these two measurements we get ${\mathcal B}(η\toπ^{+}π^{-}) < 4.4\times10^{-6}$ at 90\% confidence level.

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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