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arXiv 0704.3593hep-ex
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衰变D^0 --> K^- K^+ pi^0的振幅分析

Amplitude Analysis of the decay D^0 --> K^- K^+ pi^0

BABAR Collaboration, B. Aubert

摘要:

我们利用BaBar实验记录的CM能量约为10.6 GeV的385 fb^-1的e^+e^-碰撞,研究了单一卡比博抑制衰变D^0 --> K^- K^+ pi ^0的振幅。我们测量到D 0 bar和D 0衰变到K^*(892)^+ K^-态之间的强相位差为-35.5 +/- 1.9(stat)+/- 2.2(syst)度,它们的振幅比为0.599 +/- 0.013(stat)+/- 0.011(syst)。我们观察到Kpi和K^-K^+标量和矢量振幅的重要贡献,并分析了这些系统中螺旋角余弦的矩。我们没有发现带电标量kappa(800)态的证据,也没有发现更高自旋态的证据。我们还在1 GeV/c^2附近的有限质量范围内对K^-K^+系统进行了与模型无关的分波分析。我们研究了几种Kpi S波振幅的模型,并描述了哪一个是我们的数据的青睐。

英文摘要:

Using 385 fb^-1 of e^+e^- collisions at the CM energies of around 10.6 GeV recorded by the BaBar experiment, we study the amplitudes of the singly Cabibbo-suppressed decay D^0 --> K^- K^+ pi^0. We measure the strong phase difference between the D0bar and D0 decays to the K^*(892)^+ K^- state to be -35.5 +/- 1.9 (stat) +/- 2.2 (syst) degrees, and their amplitude ratio to be 0.599 +/- 0.013 (stat) +/- 0.011 (syst). We observe significant contributions from the Kpi and K^-K^+ scalar and vector amplitudes, and analyze the moments of the cosine of the helicity angle in these systems. We find no evidence for charged, scalar kappa(800) state, nor for higher spin states. We also perform a model-independent partial wave analysis of the K^-K^+ system in a limited mass range around 1 GeV/c^2. We study several models for Kpi S-wave amplitude, and describe which one is favored by our data.

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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