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arXiv 0906.2219hep-ex
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在BABAR上寻找Y(3S)-->gamma A^0,A^0-->tau^+tau^-中的低质量希格斯玻色子

Search for a low-mass Higgs boson in Y(3S)-->gamma A^0, A^0-->tau^+tau^- at BABAR

The BABAR Collaboration, B. Aubert

摘要:

我们在辐射衰变$Υ(3S)\toγA^0$、$A^0\toτ^+τ^-$、$τ^+\to e^+ν_e \barν_τ$或$τ^+\to μ^+ ν_μ \barν_τ$中寻找轻希格斯玻色子$A^0$。数据样本包含\babar检测器记录的1.22亿个$Υ(3S)$事件。我们没有发现证据表明,在研究的$τ^+τ^-$不变质量区域的$4.03<m_{τ^+τ^-}<10.10$ \gevcc的狭窄结构。我们排除了90%置信水平(C.L.)低质量希格斯粒子衰变为$τ^+τ^-$,其产物分支分数为${\cal {B}}(Υ(3S)\toγA^0)\times {\cal {B}}(A^0\toτ^+τ^-)$ $>(1.5-16)\times 10^{-5}$,跨越$m_{τ^+τ^-}$范围。我们还设置了90%的C. L。$τ^+τ^-$的上限-$η_b$在${\mathcal{B}}(η_b\to τ^+τ^-)<8%$的衰减。

英文摘要:

We search for a light Higgs boson, $A^0$, in the radiative decay $Υ(3S)\toγA^0$, $A^0\toτ^+τ^-$, $τ^+\to e^+ν_e \barν_τ$ or $τ^+\to μ^+ ν_μ \barν_τ$. The data sample contains 122 million $Υ(3S)$ events recorded with the \babar detector. We find no evidence for a narrow structure in the studied $τ^+τ^-$ invariant mass region of $4.03<m_{τ^+τ^-}<10.10$ \gevcc. We exclude at the 90% confidence level (C.L.) a low mass Higgs decaying to $τ^+τ^-$ with a product branching fraction ${\cal {B}}(Υ(3S)\toγA^0)\times {\cal {B}}(A^0\toτ^+τ^-)$ $>(1.5-16)\times 10^{-5}$ across the $m_{τ^+τ^-}$ range. We also set a 90% C.L. upper limit on the $τ^+τ^-$-decay of the $η_b$ at ${\mathcal{B}}(η_b\to τ^+τ^-)<8%$.

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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