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arXiv hep-ex/0209080hep-ex
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Psi(2S)二体和三体强子衰变

Psi(2S) two- and three-body hadronic decays

BES Collaboration, J. Z. Bai

摘要:

我们报告了基于北京正负电子对撞机BESI探测器收集的4 × 10^6 psi(2S)事件的数据样本,测量了psi(2S)衰变为omega pi pi,b1 pi,omega f2(1270),omega KK,omega p pbar,phi pi pi pi,phi f0(980),phi KK的分支分数,以及phi p pbar最终状态的上限。b1 π和ω f2(1270)的分支分数更新了之前的BES结果,而其他衰变模式的分支分数则是首次测量。psi(2S)和J/psi分支分数的比率比根据12%规则所预期的小5倍(对于Ω f2(1270)),小2倍(对于Ω pi pi、Ω p pbar和phi KK),而对于其他研究的通道,比率在误差内与预期一致。

英文摘要:

We report measurements of branching fractions for psi(2S) decays into omega pi pi, b1 pi,omega f2(1270),omega KK, omega p pbar, phi pi pi, phi f0(980),phi KK, and an upper limit for phi p pbar final states based on a data sample of 4 X 10^6 psi(2S) events collected with the BESI detector at the Beijing Electron-Positron Collider. The branching fractions for b1 pi and omega f2(1270) update previous BES results, while those for other decay modes are first measurements. The ratios of psi(2S)and J/psi branching fractions are smaller than what is expected from the 12% rule by a factor of five for omega f2(1270),by a factor of two for omega pi pi, omega p pbar, and phi KK, while for other studied channels the ratios are consistent with expectation within errors.

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