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arXiv 0809.1174hep-ex
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B0介子衰变到ω K0S,eta' K0和pi0K0S的含时CP非对称参数的测量

Measurement of time dependent CP asymmetry parameters in B0 meson decays to omega K0S, eta'K0, and pi0K0S

The BABAR Collaboration, B. Aubert

摘要:

我们提出了测量的依赖于时间的CP破坏参数S和C的衰减ω K 0 S,eta'K 0,重建为eta' K 0 S和eta'K 0 L,和pi 0 K 0 S。数据样本对应于斯坦福直线加速器中心的PEP-II非对称能量e+e对撞机产生的467 x 10^6 BB对的完整BABAR数据集。结果为:S_{omega K0S} = 0.55^{+0.26}_{-0.29} +/- 0.02,C_{omega K0S} =-0.52 ^{+0.22}_{-0.20} +/- 0.03,S_{eta' K0} = 0.57 +/- 0.08 +/- 0.02,C_{eta' K0} = -0.08 +/- 0.06 +/- 0.02,S_{pi0 K0S} = 0.55 +/- 0.20 +/- 0.03,C_{pi0 K0S} = 0.13 +/- 0.13 +/- 0.03,其中第一个误差是统计误差,第二个误差是系统误差。这些结果与我们以前的测量结果以及在B 0-> J/psi K 0 S中测量的sin 2beta的世界平均值一致。

英文摘要:

We present measurements of the time-dependent CP-violation parameters S and C in the decays omega K0S, eta'K0, reconstructed as eta'K0S and eta'K0L, and pi0K0S. The data sample corresponds to the full BABAR dataset of 467 x 10^6 BB pairs produced at the PEP-II asymmetric-energy e+e- collider at the Stanford Linear Accelerator Center. The results are S_{omega K0S} = 0.55^{+0.26}_{-0.29} +/- 0.02, C_{omega K0S} = -0.52^{+0.22}_{-0.20} +/- 0.03, S_{eta' K0} = 0.57 +/- 0.08 +/- 0.02, C_{eta' K0} = -0.08 +/- 0.06 +/- 0.02, S_{pi0 K0S} = 0.55 +/- 0.20 +/- 0.03, and C_{pi0 K0S} = 0.13 +/- 0.13 +/- 0.03, where the first errors are statistical and the second systematic. These results are consistent with our previous measurements and the world average of sin2beta measured in B0 -> J/psi K0S.

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