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arXiv 1012.2415hep-ex
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D0中的CP破坏-> pi+ pi-CDF处的衰减

CP violation in the D0 -> pi+ pi- decay at CDF

Michael Joseph Morello

摘要:

我们使用约215,000个在CDF数据的约$5.94$ fb $^{-1}$中重建的衰变,报告了$D^0\toπ^+π^-$衰变中\CP违反不对称性的测量。我们使用强$D^{\star +}\to D^0π^+$衰变(“$D^{\star}$标签”)来识别粲介子在产生时的味道,并利用\CP -在$p\bar{p}$碰撞中保持强$c\bar{c}$对产生。具有和不具有$D^{\star}$标记的Cabibbo偏好的$D^0\to K^-π^+$衰变的较高统计样本用于高度抑制由于检测器效应引起的系统不确定性。其结果$\Acp(D^0 \to π^{+}π^{-}) = \bigl[0.22\pm0.24\stat\pm0.11\syst\bigr]%$是迄今为止世界上最精确的测量结果,并且完全符合没有\CP \违规的要求。

英文摘要:

We report a measurement of the \CP\ violating asymmetry in $D^0\toπ^+π^-$ decays using approximately 215,000 decays reconstructed in about $5.94$ fb$^{-1}$ of CDF data. We use the strong $D^{\star +}\to D^0π^+$ decay ("$D^{\star}$ tag") to identify the flavor of the charmed meson at production time and exploit \CP-conserving strong $c\bar{c}$ pair-production in $p\bar{p}$ collisions. Higher statistic samples of Cabibbo-favored $D^0\to K^-π^+$ decays with and without $D^{\star}$ tag are used to highly suppress systematic uncertainties due to detector effects. The result, $\Acp(D^0 \to π^{+}π^{-}) = \bigl[0.22\pm0.24\stat\pm0.11\syst\bigr]%$, is the world's most precise measurement to date and it is fully consistent with no \CP\ violation.

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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