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arXiv 0708.2097hep-ex
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B0--> Ks pi + pi-的时间依赖性Dalitz图分析

Time-dependent Dalitz Plot Analysis of B0 --> Ks pi+ pi-

The BABAR Collaboration, B. Aubert

摘要:

我们执行$B^0 \to K^0_{\scriptscriptstyle S}π^+π^-$的时间依赖性Dalitz图分析,以提取$f_0(980) K^0_{\scriptscriptstyle S}$和$ρ^0(770) K^0_{\scriptscriptstyle S}$的${CP}$违反参数以及$K^{*+}(892) π^-$的直接${CP}$-不对称性。这些结果是从$(383\pm3)\times10^{6}$ $B \bar{B}$衰变的数据样本中获得的,这些数据样本是在SLAC的PEP 2非对称能量$B$工厂用BaBar探测器收集的。$B^0$衰变为$f_0(980)K^0_{\scriptscriptstyle S}$和$ρ^0(770) K^0_{\scriptscriptstyle S}$时$2β_{\rm eff}$的测量值分别为$(89^{+22}_{-20} \pm 5 \pm 8)^\circ$和$(37 ^{+19}_{-17} \pm 5 \pm 6)^\circ$,其中第一个引用的不确定度为统计不确定度,第二个为系统不确定度,第三个为Dalitz图信号模型不确定度。我们将$2β_{\rm eff}(f_0(980)K^0_{\scriptscriptstyle S})\neq 0$的显著性测量为$4.3 σ$。在$K^*(892) π$的衰变中,我们发现了$A_{CP} = -0.18 \pm 0.10 \pm 0.03 \pm 0.03$。测量的$B^0 \to K^{*+}(892) π^-$和$\bar{B}^0 \to K^{*-}(892) π^+$的衰减幅度之间的相位差为$(-164 \pm 24 \pm 12 \pm 15)^\circ$。所有结果都是初步的。

英文摘要:

We perform a time-dependent Dalitz plot analysis of $B^0 \to K^0_{\scriptscriptstyle S}π^+π^-$ in order to extract the ${CP}$ violation parameters of $f_0(980) K^0_{\scriptscriptstyle S}$ and $ρ^0(770) K^0_{\scriptscriptstyle S}$ and direct ${CP}$-asymmetries of $K^{*+}(892) π^-$. The results are obtained from a data sample of $(383\pm3)\times10^{6}$ $B \bar{B}$ decays, collected with the BaBar detector at the PEP2 asymmetric--energy $B$ factory at SLAC. The measured values of $2β_{\rm eff}$ in $B^0$ decays to $f_0(980)K^0_{\scriptscriptstyle S}$ and $ρ^0(770) K^0_{\scriptscriptstyle S}$ are $(89^{+22}_{-20} \pm 5 \pm 8)^\circ$ and $(37 ^{+19}_{-17} \pm 5 \pm 6)^\circ$, respectively, where the first quoted uncertainty is statistical, the second is systematic and the third is Dalitz plot signal model uncertainty. We measure the significance of $2β_{\rm eff}(f_0(980)K^0_{\scriptscriptstyle S})\neq 0$ to be $4.3 σ$. In decays to $K^*(892) π$ we find $A_{CP} = -0.18 \pm 0.10 \pm 0.03 \pm 0.03$. The measured phase difference between the decay amplitudes of $B^0 \to K^{*+}(892) π^-$ and $\bar{B}^0 \to K^{*-}(892) π^+$ is $(-164 \pm 24 \pm 12 \pm 15)^\circ$. All results are preliminary.

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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