使用量子相关测量确定D0 -> K-pi+ pi0和D0 -> K-pi+pi+pi-相干因子和平均强相位差
Determination of the D0 -> K-pi+pi0 and D0 -> K-pi+pi+pi- Coherence Factors and Average Strong-Phase Differences Using Quantum-Correlated Measurements
摘要：
给出了D 0->K-pi+ pi 0和D 0->K-pi+pi+pi-的相干因子（R_Kpipi0和R_K3pi）和平均强相位差（delta_D^Kpipi0和delta_D^K3pi）的首次测量。这些参数可以用来改进B^- -> DK^-衰变中幺正三角角γ的确定，其中D是衰变到相同终态的D^0或Dbar^0介子。这些测量是使用在psi（3770）共振下的e+e碰撞中产生的量子相关的、完全重构的D^0D巴^0对进行的。测量值为：R_Kpipi0=0.84+/-0.07，delta_D^Kpipi0 =（227+14-17）度，$R_K3pi=0.33+0.20-0.23，以及delta_D^K3pi=（114+26-23）度。这些结果表明在衰变D。->K-pi+ pi。中的显著相干性，而在衰变D。->K-pi+pi+pi-中观察到较低的相干性。分析还导致在其他D介子参数的知识，特别是D 0->K-pi+的强相位差，delta_D^Kpi，和混合参数，y的一个小的改进。
英文摘要：
The first measurements of the coherence factors (R_Kpipi0 and R_K3pi) and the average strong-phase differences (delta_D^Kpipi0 and delta_D^K3pi) for D0->K-pi+pi0 and D0->K-pi+pi+pi- are presented. These parameters can be used to improve the determination of the unitarity triangle angle gamma in B^- -> DK^- decays, where D is a D^0 or Dbar^0 meson decaying to the same final state. The measurements are made using quantum-correlated, fully-reconstructed D^0Dbar^0 pairs produced in e+e- collisions at the psi(3770) resonance. The measured values are: R_Kpipi0=0.84+/-0.07, delta_D^Kpipi0=(227+14-17) deg, $R_K3pi=0.33+0.20-0.23, and delta_D^K3pi=(114+26-23) deg. These results indicate significant coherence in the decay D0->K-pi+pi0, whereas lower coherence is observed in the decay D0->K-pi+pi+pi-. The analysis also results in a small improvement in the knowledge of other D-meson parameters, in particular the strong-phase difference for D0->K-pi+, delta_D^Kpi, and the mixing parameter, y.
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