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arXiv 0707.4609hep-ex
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用KLOE探测器研究φ到a0(980)γ的辐射衰变

Study of the radiative decay phi to a0(980) gamma with the KLOE detector

The KLOE collaboration

摘要:

用KLOE探测器在弗拉斯卡蒂φ工厂DAFNE收集的一个1.25 × 10^9 φ衰变样品,其质心能量为~ Mphi,已被用于研究φ到eta pi 0 γ的辐射衰变。这种衰变主要由φ到α 0(980)γ决定。选择了两个衰变链,对应于η到γ-γ和η到π + π-π 0。我们分别得到:Br(φ to eta pi 0 γ)=(6.92 +/- 0.10(stat.)+/- 0.20(系统))x10^(-5)和(7.19 +/- 0.17(stat.)+/- 0.24(系统))x 10 ^(-5)。已拟合的eta pi 0不变的质量分布,以获得相关的a0(980)参数。

英文摘要:

A sample of 1.25x10^9 phi decays, collected with the KLOE detector at the Frascati phi-factory DAFNE at center of mass energy ~ Mphi, has been used to study the radiative decay phi to eta pi0 gamma. This decay is dominated by phi to a0(980) gamma. Two decay chains, corresponding to eta to gamma gamma and eta to pi+ pi- pi0, have been selected. We found respectively: Br(phi to eta pi0 gamma)=(6.92 +/- 0.10 (stat.) +/- 0.20 (syst.))x10^(-5) and (7.19 +/- 0.17 (stat.) +/- 0.24 (syst.))x 10 ^(-5). The eta pi0 invariant mass distributions have been fitted to obtain the relevant a0(980) parameters.

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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