用ORGAN实验直接搜寻63-67 micro-eV范围内不含ALP共生的暗物质轴子
Direct Search for Dark Matter Axions Excluding ALP Cogenesis in the 63-67 micro-eV Range, with The ORGAN Experiment
摘要：
标准模型的轴子跷跷板希格斯门膨胀（SMASH）模型是一个动机良好的，自包含的粒子物理在一个范围内的能量尺度，预测轴子暗物质粒子存在的质量范围内的$50-200\,μ$ eV的描述。为了扫描这些质量，在强恒定磁场下的轴子晕圈镜必须在12至48 GHz之间操作。ORGAN实验（位于澳大利亚珀斯）是一个微波腔轴子晕镜，旨在搜索SMASH模型预测的大部分质量范围。在这里，我们提出的阶段1a，第一个实验扫描和搜索微波Ku波段的轴子的结果。我们的初始扫描设置了一个新的限制耦合的轴子到两个光子的$g_{aγγ}\geq 3\times 10^{-12}\, \textrm{GeV}^{-1}$在质量范围$63.2$ $67.1~μ$电子伏特与$95\%$的信心。这一结果是迄今为止在这个质量范围内最敏感的，足以排除动机良好的ALP（类轴子粒子）共成因模型的暗物质，它增加了ALP在早期宇宙的标准模型，同时解释观察到的重子和暗物质密度。为了达到这种灵敏度水平，我们利用TM $_{010}$圆柱形空腔谐振器，通过利用调谐棒在15.28至16.23 GHz之间扫描。测量进行了3.5周的持续时间与$74\%$占空比，与谐振器耦合到一个低噪声HEMT放大器，并放置在一个超导螺线管电磁体的磁场强度为11.5特斯拉。
英文摘要：
The standard model axion seesaw Higgs portal inflation (SMASH) model is a well motivated, self-contained description of particle physics over a range of energy scales that predicts axion dark matter particles to exist within the mass range of $50-200\,μ$eV. To scan these masses an axion haloscope under a strong constant magnetic field must operate between 12 to 48 GHz. The ORGAN experiment (situated in Perth, Australia) is a microwave cavity axion haloscope that aims to search the majority of the mass range predicted by the SMASH model. Here we present results of Phase 1a, the first experiment to scan and search for axions in the microwave Ku Band. Our initial scan sets a new limit on the coupling of axions to two photons of $g_{aγγ}\geq 3\times 10^{-12}\, \textrm{GeV}^{-1}$ over the mass range $63.2$ to $67.1~μ$eV with $95\%$ confidence. This result is the most sensitive to date in this mass range, sufficient to exclude the well motivated ALP (Axion Like Particle) cogenesis model for dark matter, which adds ALPs to the standard model in the early universe to simultaneously explain the observed baryon and dark matter densities. To attain this level of sensitivity we utilised a TM$_{010}$ cylindrical cavity resonator, scanned between 15.28 to 16.23 GHz through the utilisation of a tuning rod. Measurements were performed over a duration of 3.5 weeks with a $74\%$ duty cycle, with the resonator coupled to a low noise HEMT amplifier and placed inside a superconducting solenoidal electromagnet of 11.5 Tesla in magnetic field strength.
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