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arXiv 1208.6436hep-ex
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在BaBar测量D0-D0bar混合和CP破坏

Measurement of D0-D0bar Mixing and CP Violation at BaBar

Giulia Casarosa

摘要:

本文报道了在D 0->K+K-、pi+pi-和K+-pi-+通道中测量D 0-D 0 bar混合和寻找CP破坏的结果。我们使用来自D*+衰变的D 0,因此D 0在产生时的味道被同样发射的π介子的电荷标记。我们也使用一组独立的D 0的直接来自强子化的魅力夸克,但在这种情况下的魅力介子的味道是未知的。我们分析了在PEP-II非对称能量e+e对撞机上的BaBar实验收集的事件,对应于468 fb-1的积分亮度。我们测量混合参数值为yCP = [0.72 +- 0.18(stat)+- 0.12(syst)]%,并在3.3 sigma显著性下排除无混合假设。我们没有发现CP破坏的证据,观察到DeltaY = [0.09 +- 0.26(stat)+- 0.06 syst)]%,其与零一致。

英文摘要:

We report on a measurement of D0-D0bar mixing and a search for CP violation in the D0->K+K-, pi+pi- and K+-pi-+ channels. We use D0's coming from D*+ decays, so that the flavour of the D0 at production is tagged by the charge of the pion that is also emitted. We also use an independent set of D0's coming directly from the hadronization of the charm quark, but in this case the flavour of the charmed meson is not known. We analyze events collected by the BaBar experiment at the PEP-II asymmetric-energy e+e- collider, corresponding to an integrated luminosity of 468 fb-1. We measure the mixing parameter value to be yCP = [0.72 +- 0.18 (stat) +- 0.12 (syst)]%, and exclude the no-mixing hypothesis at 3.3sigma significance. We find no evidence of CP violation, observing DeltaY = [0.09 +- 0.26 (stat) +- 0.06 syst)]% which is consistent with zero.

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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