标题： 测量$D^{0}\to K^{+}π^{-}π^{0}$的速率及对$D^{0} - \overline{D^{0}}$混合的限制 显示英文标题

标题： Rate Measurement of $D^{0}\to K^{+}π^{-}π^{0}$ and Constraints on $D^{0} - \overline{D^{0}}$ Mixing

摘要： 我们报告了在Upsilon(4S)共振附近9 fb⁻¹的正负电子对撞数据中观测到的D⁰ → K⁺π⁻π⁰衰变及其速率测量结果。 信号与背景的向上涨落之间的差异为4.9个标准差。 我们测量了归一化为D⁰̄ → K⁺π⁻π⁰衰变率的D⁰ → K⁺π⁻π⁰衰变率，得到值为0.0043⁺⁰.⁰⁰¹¹₋₀.⁰⁰¹⁰（统计误差）±0.0007（系统误差）。 这种衰变可以通过双Cabibbo抑制衰变产生，或者通过D⁰通过混合演化为D⁰̄，随后发生Cabibbo允许的K⁺π⁻π⁰衰变来产生。 我们还发现CP不对称性A = (8⁺²⁵₋₂₂)%与零一致。 显示英文摘要

摘要： We present an observation and rate measurement of the decay D0 -> K+pi-pi0 produced in 9/fb of e+e- collisions near the Upsilon(4S) resonance. The signal is inconsistent with an upward fluctuation of the background by 4.9 standard deviations. We measured the rate of D0 -> K+pi-pi0 normalized to the rate of D0bar -> K+pi-pi0 to be 0.0043 +0.0011 -0.0010 (stat) +/- 0.0007 (syst). This decay can be produced by doubly-Cabibbo-suppressed decays or by the D0 evolving into a D0bar through mixing, followed by a Cabibbo-favored decay to K+pi-pi0. We also found the CP asymmetry A=(8 +25 -22)% to be consistent with zero.