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arXiv 0704.1000hep-ex
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D0 ->Ks π + π-衰变中的D0-D0bar混合的测量

Measurement of D0-D0bar mixing in D0->Ks pi+ pi- decays

L. M. Zhang

摘要:

我们报道了用时间依赖的Dalitz图分析测量D 0->Ks π + π衰变中D 0-D 0巴混合的结果。我们首先假设CP守恒,然后考虑CP破坏。这些结果是基于KEKB $e^+e^-$对撞机Belle探测器积累的540 fb $^{-1}$数据。假设CP破坏可以忽略不计,我们测量的混合参数$x=(0.80\pm0.29^{+0.09 +0.10}_{-0.07 -0.14})%$和$y=(0.33\pm0.24^{+0.08 +0.06}_{-0.12 -0.08})%$,其中的错误是统计,实验系统,系统由于Dalitz衰变模型,分别。考虑到CP破坏,我们获得$CPV$参数$|q/p|=0.86^{+0.30 +0.06}_{-0.29 -0.03}\pm0.08$和$\arg(q/p)=(-14^{+16 +5 +2}_{-18 -3 -4})^\circ$。

英文摘要:

We report a measurement of D0-D0bar mixing in D0->Ks pi+ pi- decays using a time-dependent Dalitz plot analysis. We first assume CP conservation and subsequently allow for CP violation. The results are based on 540 fb$^{-1}$ of data accumulated with the Belle detector at the KEKB $e^+e^-$ collider. Assuming negligible CP violation, we measure the mixing parameters $x=(0.80\pm0.29^{+0.09 +0.10}_{-0.07 -0.14})%$ and $y=(0.33\pm0.24^{+0.08 +0.06}_{-0.12 -0.08})%$, where the errors are statistical, experimental systematic, and systematic due to the Dalitz decay model, respectively. Allowing for CP violation, we obtain the $CPV$ parameters $|q/p|=0.86^{+0.30 +0.06}_{-0.29 -0.03}\pm0.08$ and $\arg(q/p)=(-14^{+16 +5 +2}_{-18 -3 -4})^\circ$.

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