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arXiv 0901.3803hep-ex
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在CDF运行II中搜索衰变${B^0_{(s)}\to e^+μ^-}$和${B^0_{(s)}\to e^+e^-}$

Search for the Decays ${B^0_{(s)}\to e^+μ^-}$ and ${B^0_{(s)}\to e^+e^-}$ in CDF Run II

The CDF Collaboration, T. Aaltonen

备注：
submitted to PRL
发表信息：
Phys.Rev.Lett.102:201801,2009
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摘要：

我们报告的结果，从轻子味违反衰变$B^0_{(s)}\to e^+μ^-$搜索，和口味改变中性流衰变$B^0_{(s)} \to e^+ e^-$。分析使用的数据对应于${\rm 2 fb^{-1}}$的$p \bar{p}$碰撞在$\sqrt{s}=1.96 {\rm TeV}$的集成光度与升级的对撞机探测器（CDF II）在费米实验室Tevatron收集。观察到的$B^0_{(s)}$候选者数量与背景预期一致。在90%可信度水平下得到的分支比的贝叶斯上限为$\mathcal{B}(B^0_s \to e^{+}μ^{-}) < 2.0 \times 10^{-7}$、$\mathcal{B}(B^0 \to e^{+}μ^{-})< 6.4 \times 10^{-8}$、$\mathcal{B}(B^0_s \to e^{+}μ^{-}) < 2.0 \times 10^{-7}$和$\mathcal{B}(B^0 \to e^{+}μ^{-})< 6.4 \times 10^{-8}$。在90%可信度水平上，由$\mathcal{B} (B^0_{(s)}\to e^+μ^-)$的极限，导出了Pati-Salam轻夸克质量的下限：${M_{LQ}}(B^0_s\to e^+ μ^-) > 47.8 {\rm TeV/c^2}$和${M_{LQ}}(B^0\to e^+ μ^-) > 59.3 {\rm TeV/c^2}$.

英文摘要：

We report results from a search for the lepton flavor violating decays $B^0_{(s)}\to e^+μ^-$, and the flavor-changing neutral-current decays $B^0_{(s)} \to e^+ e^-$. The analysis uses data corresponding to ${\rm 2 fb^{-1}}$ of integrated luminosity of $p \bar{p}$ collisions at $\sqrt{s}=1.96 {\rm TeV}$ collected with the upgraded Collider Detector (CDF II) at the Fermilab Tevatron. The observed number of $B^0_{(s)}$ candidates is consistent with background expectations. The resulting Bayesian upper limits on the branching ratios at 90% credibility level are $\mathcal{B}(B^0_s \to e^{+}μ^{-}) < 2.0 \times 10^{-7}$, $\mathcal{B}(B^0 \to e^{+}μ^{-})< 6.4 \times 10^{-8}$, $\mathcal{B}(B^0_s \to e^{+}μ^{-}) < 2.0 \times 10^{-7}$ and $\mathcal{B}(B^0 \to e^{+}μ^{-})< 6.4 \times 10^{-8}$. From the limits on $\mathcal{B} (B^0_{(s)}\to e^+μ^-)$, the following lower bounds on the Pati-Salam leptoquark masses are also derived: ${M_{LQ}}(B^0_s\to e^+ μ^-) > 47.8 {\rm TeV/c^2}$, and ${M_{LQ}}(B^0\to e^+ μ^-) > 59.3 {\rm TeV/c^2}$, at 90% credibility level.

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