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在贝尔寻找暗光子和暗希格斯玻色子

Search for the dark photon and the dark Higgs boson at Belle

The Belle Collaboration

发表信息：
Phys. Rev. Lett. 114, 211801 (2015)
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摘要：

暗光子（$A^\prime$）和暗希格斯玻色子玻色子（$h^\prime$）是一些最近提出的暗扇区模型中的假设成分。假设这两个暗粒子的迅速衰变，我们寻找他们的生产在所谓的希格斯-strahlung通道，$e^+e^- \rightarrow A^\prime h'$，与$h^\prime \rightarrow A^\prime A^\prime$。我们用$A^\prime \rightarrow e^+e^-$、$μ^+μ^-$或$π^+π^-$研究了10个互斥的末态，其质量范围为$0.1$ ~GeV/ $c^2$ ~ $< m_{A^\prime} < 3.5$ ~GeV/ $c^2$和$0.2$ ~GeV/ $c^2$ ~ $< m_{h'} < 10.5$ ~GeV/ $c^2$ .我们还研究了三个包含的末态，$2(e^+e^-)X$，$2(μ^+μ^-)X$和$(e^+e^-)(μ^+μ^-)X$，其中$X$表示通过丢失质量检测到的暗光子候选者，质量范围为$1.1$ ~GeV/ $c^2$ ~ $< m_{A^\prime} < 3.5$ ~GeV/ $c^2$和$2.2$ ~GeV/ $c^2$ ~ $< m_{h'} < 10.5$ ~GeV/ $c^2$。使用Belle收集的整个$977\,\mathrm{fb}^{-1}$数据集，我们未观察到显著信号。我们获得了单独的和合并的90 $\%$置信水平上限的分支分数倍的玻恩截面，$\cal B \times σ_{\mathrm{Born}}$，玻恩截面，$σ_{\mathrm{Born}}$，和暗光子耦合到暗希格斯玻色子倍的标准模型光子和暗光子之间的动力学混合，$α_D \times ε^2$。这些限制比以前的实验改进并覆盖更宽的质量范围。最终状态$3(π^+π^-)$和$2(e^+e^-)X$的极限是任何实验的第一个极限。对于等于1/137的$α_D$、$m_{h'}<$ 8 GeV/ $c^2$和$m_{A^\prime}<$ 1 GeV/ $c^2$，我们排除高于$\sim 8 \times 10^{-4}$的混合参数$ε$的值。

英文摘要：

The dark photon, $A^\prime$, and the dark Higgs boson, $h^\prime$, are hypothetical constituents featured in a number of recently proposed Dark Sector Models. Assuming prompt decays of both dark particles, we search for their production in the so-called Higgs-strahlung channel, $e^+e^- \rightarrow A^\prime h'$, with $h^\prime \rightarrow A^\prime A^\prime$. We investigate ten exclusive final-states with $A^\prime \rightarrow e^+e^-$, $μ^+μ^-$, or $π^+π^-$, in the mass ranges $0.1$~GeV/$c^2$~$< m_{A^\prime} < 3.5$~GeV/$c^2$ and $0.2$~GeV/$c^2$~$< m_{h'} < 10.5$~GeV/$c^2$. We also investigate three inclusive final-states, $2(e^+e^-)X$, $2(μ^+μ^-)X$, and $(e^+e^-)(μ^+μ^-)X$, where $X$ denotes a dark photon candidate detected via missing mass, in the mass ranges $1.1$~GeV/$c^2$~$< m_{A^\prime} < 3.5$~GeV/$c^2$ and $2.2$~GeV/$c^2$~$< m_{h'} < 10.5$~GeV/$c^2$. Using the entire $977\,\mathrm{fb}^{-1}$ data set collected by Belle, we observe no significant signal. We obtain individual and combined 90$\%$ confidence level upper limits on the branching fraction times the Born cross section, $\cal B \times σ_{\mathrm{Born}}$, on the Born cross section, $σ_{\mathrm{Born}}$, and on the dark photon coupling to the dark Higgs boson times the kinetic mixing between the Standard Model photon and the dark photon, $α_D \times ε^2$. These limits improve upon and cover wider mass ranges than previous experiments. The limits from the final-states $3(π^+π^-)$ and $2(e^+e^-)X$ are the first placed by any experiment. For $α_D$ equal to 1/137, $m_{h'}<$ 8 GeV/$c^2$, and $m_{A^\prime}<$ 1 GeV/$c^2$, we exclude values of the mixing parameter, $ε$, above $\sim 8 \times 10^{-4}$.

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