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arXiv 1004.5053hep-ex
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使用D0 -> K0S pi+ pi-和D0 -> KS0 K+ K-衰变测量D0-antiD0混合参数

Measurement of D0-antiD0 mixing parameters using D0 -> K0S pi+ pi- and D0 -> KS0 K+ K- decays

The BABAR Collaboration, P. del Amo Sanchez

摘要:

我们报告了直接测量的$D^0-overline{D}^0$混合参数通过时间依赖的振幅分析的Dalitz图的$D^0 \rightarrow K_S^0 π^+ π^-$,并首次,$D^0 \rightarrow K_S^0 K^+ K^-$衰变。衰变$D^{*+} \rightarrow D^0 π_s^+$中的低动量π介子$π_s^+$确定了中性$D$介子产生时的味道。利用SLAC的PEP-Ⅱ非对称能量对撞机上的BABAR探测器在$\sqrt s = 10.6$ ~GeV附近记录的468.5 fb $^{-1}$的$e^+e^-$碰撞束数据,我们测量了混合参数$x= [1.6 \pm 2.3 ({\rm stat.}) \pm 1.2 ({\rm syst.}) \pm 0.8 ({\rm model}) ] \times10^{-3}$和$y= [5.7 \pm 2.0 ({\rm stat.}) \pm 1.3 ({\rm syst.}) \pm 0.7 ({\rm model}) ]\times 10^{-3}$。这些结果提供了迄今为止$x$和$y$的最佳测量结果。特别是,了解$x$的价值对于理解混合的起源至关重要。

英文摘要:

We report a direct measurement of $D^0-overline{D}^0$ mixing parameters through a time-dependent amplitude analysis of the Dalitz plots of $D^0 \rightarrow K_S^0 π^+ π^-$ and, for the first time, $D^0 \rightarrow K_S^0 K^+ K^-$ decays. The low-momentum pion $π_s^+$ in the decay $D^{*+} \rightarrow D^0 π_s^+$ identifies the flavor of the neutral $D$ meson at its production. Using 468.5 fb$^{-1}$ of $e^+e^-$ colliding-beam data recorded near $\sqrt s = 10.6$~GeV by the BABAR detector at the PEP-II asymmetric-energy collider at SLAC, we measure the mixing parameters $x= [1.6 \pm 2.3 ({\rm stat.}) \pm 1.2 ({\rm syst.}) \pm 0.8 ({\rm model}) ] \times10^{-3}$, and $y= [5.7 \pm 2.0 ({\rm stat.}) \pm 1.3 ({\rm syst.}) \pm 0.7 ({\rm model}) ]\times 10^{-3}$. These results provide the best measurement to date of $x$ and $y$. The knowledge of the value of $x$, in particular, is crucial for understanding the origin of mixing.

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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