Dark Matter Search in a Proton Beam Dump with MiniBooNE
Dark Matter Search in a Proton Beam Dump with MiniBooNE
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DOI：
10.1103/physrevlett.118.221803
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发表时间：
2017-05-31
影响因子：
8.6
通讯作者：
Yu, J.
中科院分区：
文献类型：
--
作者：
Aguilar-Arevalo, A. A.;Backfish, M.;Yu, J.
MiniBooNE-DM合作研究了矢量玻色子介导的暗物质的产生，使用费米实验室8-GeV助推器质子束，在一个专门的运行中，将1.86 x 10（20）个质子输送到一个钢制束流收集器。MiniBooNE探测器位于下游490米处，通过探测器矿物油中核子的弹性散射对暗物质敏感。为以前的MiniBooNE散射结果开发的分析方法，并同时分析了几个约束数据集，以尽量减少中微子通量和相互作用率的系统误差。没有观察到超过背景的事件，导致暗物质横截面参数的90%置信限，Y = 10（2）alpha（D）（m（chi）/m（V））（4）小于或接近10（-8），对于alpha（D）= 0.5和暗物质质量为0.01 < m（chi）< 0.3 GeV的矢量门模型中的暗物质。这是在这个质量和耦合范围内专用质子束流收集器搜索的最佳限制，并延伸到直接暗物质搜索的质量范围以下。这些结果展示了一种新的和强大的暗物质搜索与束流收集实验的方法。
The MiniBooNE-DM Collaboration searched for vector-boson mediated production of dark matter using the Fermilab 8-GeV Booster proton beam in a dedicated run with 1.86 x 10(20) protons delivered to a steel beam dump. The MiniBooNE detector, 490 m downstream, is sensitive to dark matter via elastic scattering with nucleons in the detector mineral oil. Analysis methods developed for previous MiniBooNE scattering results were employed, and several constraining data sets were simultaneously analyzed to minimize systematic errors from neutrino flux and interaction rates. No excess of events over background was observed, leading to a 90% confidence limit on the dark matter cross section parameter, Y = epsilon(2)alpha(D)(m(chi)/m(V))(4) less than or similar to 10(-8), for alpha(D) = 0.5 and for dark matter masses of 0.01 < m(chi) < 0.3 GeV in a vector portal model of dark matter. This is the best limit from a dedicated proton beam dump search in this mass and coupling range and extends below the mass range of direct dark matter searches. These results demonstrate a novel and powerful approach to dark matter searches with beam dump experiments.