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arXiv 1205.6579hep-ex
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LHCb中B衰变的直接CP破坏结果

Results on direct CP violation in B decays in LHCb

Till Moritz Karbach

摘要:

我提出了三项研究从LHCb实验的主题直接CP破坏$B^0$和$B_s$衰变。首先,我们测量了$B^\pm\toψK^\pm$衰变中的CP不对称性,用$ψ=J/ψ, ψ(2S)$,在$\sqrt{s}=7 TeV$使用0.35 $fb^{-1}$的$pp$碰撞。我们没有发现CP破坏的证据。其次,使用相同的数据样本,我们看到了在$B_s$介子衰变为$K^\pmπ^-π^+$对$A_{CP}(B_s\to Kπ) = 0.27 \pm 0.08 {\rm (stat)}\pm 0.02 {\rm (syst)}$($3.3σ$)中CP破坏的第一个证据。第三,利用1.0 $fb^{-1}$数据,给出了$B^\pm\to D K^\pm$系统CP敏感观测量的测量。它们包括抑制模式$B^\pm\to[π^\pm K^\mp]_D K^\pm$的首次观测。结合几个$D$末态,观察到$B^\pm\to D K^\pm$衰变中的CP破坏,其意义为$5.8σ$。

英文摘要:

I present three studies from the LHCb experiment on the subject of direct CP violation in $B^0$ and $B_s$ decays. First, we measure the CP asymmetry in $B^\pm\toψK^\pm$ decays, with $ψ=J/ψ, ψ(2S)$, using 0.35 $fb^{-1}$ of $pp$ collisions at $\sqrt{s}=7 TeV$. We find no evidence for CP violation. Second, using the same data sample, we see the first evidence of CP violation in the decays of $B_s$ mesons to $K^\pmπ^-π^+$ pairs, $A_{CP}(B_s\to Kπ) = 0.27 \pm 0.08 {\rm (stat)}\pm 0.02 {\rm (syst)}$ ($3.3σ$). Third, using 1.0 $fb^{-1}$ of data, measurements of CP sensitive observables of the $B^\pm\to D K^\pm$ system are presented. They include the first observation of the suppressed mode $B^\pm\to[π^\pm K^\mp]_D K^\pm$. Combining several $D$ final states, CP violation in $B^\pm\to D K^\pm$ decays is observed with a significance of $5.8σ$.

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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