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Measurement of y CP in D 0 D ˉ 0 oscillation using quantum correlations in e + e ? D 0 D ˉ 0 at s = 3.773 GeV

机译: y CP D 0 D ˉ 0 < / mml:mrow> e + e D 0 D ˉ 0 s < / mml:mi> = 3.773 GeV

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We report a measurement of the parameteryCPinD0–Dˉ0oscillations performed by taking advantage of quantum coherence between pairs ofD0Dˉ0mesons produced ine+e?annihilations near threshold. In this work, doubly-taggedD0Dˉ0events, where oneDdecays to aCPeigenstate and the otherDdecays in a semileptonic mode, are reconstructed using a data sample of 2.92?fb?1collected with the BESIII detector at the center-of-mass energy ofs=3.773GeV. We obtainyCP=(?2.0±1.3±0.7)%, where the first uncertainty is statistical and the second is systematic. This result is compatible with the current world average.
机译:我们报告了通过利用在阈值附近产生+ + e灭的D0Dˉ0介子对之间的量子相干性来测量参数CPinD0–Dˉ0振荡的方法。在这项工作中,使用由BESIII检测器采集的2.92?fb?1数据样本在质心能量== 3.773GeV处采集的2.92?fb?1数据重构了双重标记的D0Dˉ0事件,其中一个D衰变为一个正电子态,另一个D衰变为半轻子态。我们获得yCP =(?2.0±1.3±0.7)%,其中第一个不确定度是统计的,第二个不确定度是系统的。这一结果与当前的世界平均水平相符。

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