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arXiv 0806.2992hep-ex
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在Upperdom(5S)共振附近的Upperdom(1 S)pi+pi-和Upperdom(2S)pi+pi-的异常产生

The anomalous Upsilon(1S)pi+pi- and Upsilon(2S)pi+pi- production near the Upsilon(5S) resonance

K. -F. Chen

摘要:

我们报道了在Uppersons(5S)共振峰附近的e+e-> Uppersons(1 S)pi + pi-,Uppersons(2S)pi + pi-,Uppersons(3S)pi+pi-和Uppersons(1 S)K+K-的研究。这些结果是基于KEKB电子对撞机Belle探测器收集的21.7 fb^-1的数据样本得出的。将这些信号归因于Upperdum(5S)共振,从观测到的截面中得到了部分宽度γ(Upperdum(5S)-> Upperdum(1 S)pi+pi-)= 0.59+-0.04(stat)+-0.09(syst)MeV和γ(Upperdum(5S)-> Upperdum(2S)pi+pi-)= 0.85+-0.07(stat)+-0.16(syst)MeV。这些值超过了两个以上的数量级,以前测得的部分宽度较低的Uppermance共振之间的双介子跃迁。

英文摘要:

We report the study of e+e- -> Upsilon(1S)pi+pi-, Upsilon(2S)pi+pi-, Upsilon(3S)pi+pi-, and Upsilon(1S)K+K-, near the peak of the Upsilon(5S) resonance. The results are based on a data sample of 21.7 fb^-1 collected with the Belle detector at the KEKB e+e- collider. Attributing the signals to the Upsilon(5S) resonance, the partial widths Gamma(Upsilon(5S)->Upsilon(1S)pi+pi-) = 0.59+-0.04(stat)+-0.09(syst) MeV and Gamma(Upsilon(5S)->Upsilon(2S)pi+pi-) = 0.85+-0.07(stat)+-0.16(syst) MeV are obtained from the observed cross sections. These values exceed by more than two orders of magnitude the previously measured partial widths for dipion transitions between lower Upsilon resonances.

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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