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arXiv 1106.4046hep-ex
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使用B-> DK,D->Ks pi+pi-衰减的分箱模型独立Dalitz图分析首次测量phi_3

First measurement of phi_3 with a binned model-independent Dalitz plot analysis of B->DK, D->Ks pi+pi- decay

Belle Collaboration, I. Adachi, K. Adamczyk, H. Aihara

摘要:

我们提出了第一次测量的角度φ 3的幺正三角形使用分箱模型无关的Dalitz图分析技术的B->DK,D->Ks π + π-衰变链。该方法基于CLEO协作组对与D->Ks pi+ pi-振幅的强相位相关的参数的测量。该分析使用了贝尔实验在厄普什(4S)共振下收集的772 × 10^6个BBbar对的完整数据集。我们得到φ 3 =(77.3^{+15.1}_{-14.9} +-4.2 +-4.3)度和抑制幅度比rB = 0.145 +-0.030 +-0.011 +-0.011。这里第一个误差是统计的,第二个是实验系统的不确定性,第三个是由于CLEO获得的强相位参数的精度的误差。这个结果是初步的。

英文摘要:

We present the first measurement of the angle phi_3 of the unitarity triangle using a binned model-independent Dalitz plot analysis technique of B->DK, D->Ks pi+pi- decay chain. The method is based on the measurement of parameters related to the strong phase of D->Ks pi+ pi- amplitude performed by the CLEO collaboration. The analysis uses full data set of 772x10^6 BBbar pairs collected by the Belle experiment at Upsilon(4S) resonance. We obtain phi3 = (77.3^{+15.1}_{-14.9} +- 4.2 +- 4.3) degree and the suppressed amplitude ratio rB = 0.145 +- 0.030 +- 0.011 +- 0.011. Here the first error is statistical, the second is experimental systematic uncertainty, and the third is the error due to precision of strong phase parameters obtained by CLEO. This result is preliminary.

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