TRIUMF的DarkLight实验
The DarkLight Experiment at TRIUMF
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中文总结 AI 辅助
DarkLight实验在TRIUMF的ARIEL加速器上调试，利用磁谱仪和GEM探测器搜索质量13-17 MeV的轻子耦合新玻色子，验证了探测器性能与模拟一致，未来将升级至50 MeV束流。
中文摘要 AI 辅助
本文报告了位于加拿大温哥华TRIUMF的ARIEL超导电子直线加速器上DarkLight实验的调试情况。DarkLight旨在利用ARIEL电子束寻找一种新的玻色子$A^\prime$，该玻色子优先与轻子耦合，质量范围在13-17 MeV/$c^2$。这种玻色子可通过$e^-~X\rightarrow e^-~X~A^\prime$过程产生，并利用其衰变$A^\prime\rightarrow e^+~e^-$来重建$A^\prime$的不变质量。$e^+e^-$对通过一对磁谱仪探测。每个谱仪配备两个三重GEM探测器和一组闪烁条触发探测器（hodoscope）用于触发事件读出。实验调试使用了10至30 MeV的电子束能量，靶为1$~\mu$m厚的碳靶。当两个谱仪的极性均设置为选择电子时，利用弹性散射和Møller散射来检验探测器性能，并与蒙特卡洛模拟的预测分布进行比较。计划中的e-linac升级将允许使用1$~\mu$m厚的钽靶，在高达50 MeV的束流能量下进行搜索。
英文摘要
This paper reports on the commissioning of the DarkLight experiment at the ARIEL superconducting electron linear accelerator located at TRIUMF in Vancouver, Canada. DarkLight was designed to utilize the ARIEL electron beam to search for a new boson, $A^\prime$, which preferentially couples to leptons, with a mass in the range 13-17 MeV/$c^2$. Such a boson could be produced via the $e^-~X\rightarrow e^-~X~A^\prime$ process, and the resulting $A^\prime\rightarrow e^+~e^-$ decay used to reconstruct the invariant mass of the $A^\prime$. The $e^+e^-$ pair is detected using a pair of magnetic spectrometers. Each spectrometer is instrumented with two triple GEM detectors and a scintillating strip hodoscope to trigger the event readout. Electron beam energies between 10 and 30 MeV were used to commission the experiment with a 1$~μ$m thick carbon target. With both spectrometer polarities set to select electrons, elastic and Møller scattering were used to examine detector performance and compare with predicted distributions from Monte Carlo simulations. Planned upgrades to the e-linac will allow searches to be made with beam energies up to 50 MeV using a 1$~μ$m thick tantalum target.
发表机构
- Massachusetts Institute of Technology（麻省理工学院）
- TRIUMF（特柳姆弗国家粒子加速器中心）
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