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arXiv 0901.1431hep-ex
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测量衰变Uppersons(4S)-> Uppersons(1 S)pi+pi-的分支分数

Measurement of the branching fraction for the decay Upsilon(4S) -> Upsilon(1S)pi+pi-

The Belle Collaboration, A. Sokolov, M. Shapkin

摘要:

我们使用KEKB非对称能量e+e-对撞机Belle探测器收集的604.6/fb数据研究了带电荷π介子发射的Uppermos态之间的跃迁。测得的产物支化分数为B(Upperoxide(4S)-> Upperoxide(1 S)pi+pi-)* B(Upperoxide(1 S)-> mu+mu-)= =(2.11 +/- 0.30(stat.)+/- 0.14(系统))* 10^(-6),部分衰减宽度为Gamma(Uppermance(4S)-> Uppermance(1 S)pi+pi-)= =(1.75 +/- 0.25(stat.)+/- 0.24(系统))凯

英文摘要:

We study transitions between Upsilon states with the emission of charged pions using 604.6/fb of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The measured product branching fraction is B(Upsilon(4S) -> Upsilon(1S)pi+pi-) * B(Upsilon(1S) -> mu+mu-) = = (2.11 +/- 0.30(stat.) +/- 0.14(sys.))*10^(-6) and the partial decay width is Gamma(Upsilon(4S) -> Upsilon(1S)pi+pi-) = = (1.75 +/- 0.25(stat.) +/- 0.24(sys.)) keV.

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