arXiv 0710.31562007-10-16hep-ex

BaBar的$b \to s$企鹅衰变中的CP破坏

CP-violation in $b \to s$ Penguin Decays at BaBar

BaBar Collaboration, Nitesh Soni

备注：: Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 1 eps figure

摘要：

我们提出了新的和更新的$BABAR$测量的CP破坏的研究，许多$b\to s $企鹅衰变模式。我们报告了在$B^0 \to η^{'} K^0$中首次观察到混合诱导的CP破坏，其显著性（包括系统不确定性）为5.5 $σ$。我们还提出了衰变$B^0 \to ρ^0 K^0$的第一个观察。使用随时间变化的Dalitz图分析的$B^0\to K^+K^- K^0$衰变，CP参数$\mathcal A_{CP}$和$β_{eff}$测量与$4.8σ$的显着性，我们拒绝在$4.5σ$的$π/2 - β_{eff}$附近的解决方案。我们还提出了更新的测量CP破坏参数的$B^0 \to K_S^0 π^0$，$K_S^0K_S^0K_S^0$和$π^0 π^0 K_S^0$衰变。最后给出了$B^{\pm}\to η^{'} K^{\pm}$、$ηK^{\pm}$、$ωK^{\pm}$衰变的电荷不对称性的最新测量结果。测量是基于在SLAC的PEP-II $B$ -介子工厂用$BABAR$探测器在$Υ(4S)$共振处记录的数据样本。

英文摘要：

We present the new and updated $BABAR$ measurements of CP-violation studies for many $b\to s $ penguin decay modes. We report the first observation of mixing-induced CP-violation in $B^0 \to η^{'} K^0$ with a significance (including systematic uncertainties) of 5.5$σ$. We also present the first observation of the decay $B^0 \to ρ^0 K^0$. Using the time-dependent Dalitz plot analysis of $B^0\to K^+K^- K^0$ decay, the CP-parameters $\mathcal A_{CP}$ and $β_{eff}$ are measured with $4.8σ$ significance, and we reject the solution near $π/2 - β_{eff}$ at $4.5σ$. We also present the updated measurements of CP-violating parameters for $B^0 \to K_S^0 π^0$, $K_S^0K_S^0K_S^0$ and $π^0 π^0 K_S^0$ decays. An updated measurements of the CP-violating charge asymmetries for $B^{\pm}\to η^{'} K^{\pm}$, $ηK^{\pm}$, $ωK^{\pm}$ decays are also presented. The measurements are based on the data sample recorded at the $Υ(4S)$ resonance with $BABAR$ detector at the PEP-II $B$-meson Factory at SLAC.

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英文摘要：

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