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arXiv 0802.2268hep-ex
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在CLEO用量子相关测量确定e+e- -> D0 D0bar中D0 -> K+ π-相对强相

Determination of the D0 -> K+pi- Relative Strong Phase Using Quantum-Correlated Measurements in e+e- -> D0 D0bar at CLEO

The CLEO Collaboration, D. M. Asner

摘要:

利用Psi(3770)衰变中成对产生的D 0和D 0 bar之间的量子相干性,研究了由参数x和y表征的粲混合,并首次确定了Cabibbo抑制的D 0-> K+pi-和Cabibbo支持的D 0 bar-> K+pi-之间相对较强的相位δ.我们分析了CLEO-c探测器在E_cm = 3.77 GeV下收集的281 pb^-1的e+e碰撞数据中的100万个D 0 D 0 bar对样本。将CLEO-c测量结果与支化分数输入数据和其他实验中R_M =(x^2+y^2)/2和R_{WS} = Gamma(D 0-> K+pi-)/Gamma(D 0 bar-> K+pi-)的时间积分测量结果相结合,我们得到\cos δ= 1.03 + 0.31 - 0.17 +- 0.06,其中的不确定度分别是统计的和系统的。此外,通过进一步包括粲混合参数的外部测量,我们得到了另一个测量值:\cos δ= 1.10 +- 0.35 +- 0.07,以及x \sin δ=(4.4 +2.7-1.8 +- 2.9)x 10^-3和δ= 22 +11-12 +9-11度。

英文摘要:

We exploit the quantum coherence between pair-produced D0 and D0bar in psi(3770) decays to study charm mixing, which is characterized by the parameters x and y, and to make a first determination of the relative strong phase δbetween doubly Cabibbo-suppressed D0 -> K+pi- and Cabibbo-favored D0bar -> K+pi-. We analyze a sample of 1.0 million D0D0bar pairs from 281 pb^-1 of e+e- collision data collected with the CLEO-c detector at E_cm = 3.77 GeV. By combining CLEO-c measurements with branching fraction input and time-integrated measurements of R_M = (x^2+y^2)/2 and R_{WS} = Gamma(D0 -> K+pi-)/Gamma(D0bar -> K+pi-) from other experiments, we find \cosδ= 1.03 +0.31-0.17 +- 0.06, where the uncertainties are statistical and systematic, respectively. In addition, by further including external measurements of charm mixing parameters, we obtain an alternate measurement of \cosδ= 1.10 +- 0.35 +- 0.07, as well as x\sinδ= (4.4 +2.7-1.8 +- 2.9) x 10^-3 and δ= 22 +11-12 +9-11 degrees.

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