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arXiv 0802.3299hep-ex
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$B^{\pm} \to J/ψK^{\pm}(π^{\pm})$衰变中CP直接破坏的研究

Study of direct CP violation in $B^{\pm} \to J/ψK^{\pm}(π^{\pm})$ decays

D0 Collaboration, V. Abazov

备注：
7 pages, 3 figures
发表信息：
Phys.Rev.Lett.100:211802,2008
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摘要：

我们提出了一个搜索的直接CP破坏的$B^{\pm} \to J/ψK^{\pm}(π^{\pm})$衰变。事件样本选自费米实验室Tevatron对撞机运行II中D0实验记录的$p\bar{p}$碰撞的2.8 fb $^{-1}$。电荷不对称性$A_{CP}(B^+ \to J/ψK^+) = +0.0075 \pm 0.0061$（stat.）$\pm 0.0027$（系统）使用大约4万个$B^{\pm} \to J/ψK^{\pm}$衰变的样本获得。达到的精度与标准模型的某些扩展预测的预期偏差相同。我们还测量了电荷不对称性$A_{CP}(B^+ \to J/ψπ^+) = -0.09 \pm 0.08$（统计。）$\pm 0.03$（系统）。

英文摘要：

We present a search for direct CP violation in $B^{\pm} \to J/ψK^{\pm}(π^{\pm})$ decays. The event sample is selected from 2.8 fb$^{-1}$ of $p\bar{p}$ collisions recorded by D0 experiment in Run II of the Fermilab Tevatron Collider. The charge asymmetry $A_{CP}(B^+ \to J/ψK^+) = +0.0075 \pm 0.0061$(stat.)$\pm 0.0027$(syst.) is obtained using a sample of approximately 40 thousand $B^{\pm} \to J/ψK^{\pm}$ decays. The achieved precision is of the same level as the expected deviation predicted by some extensions of the standard model. We also measured the charge asymmetry $A_{CP}(B^+ \to J/ψπ^+) = -0.09 \pm 0.08$(stat.)$\pm 0.03$(syst.).

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