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arXiv 0904.3706hep-ex
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MINOS实验的最新结果

Recent Results from the MINOS experiment

Milind V. Diwan

摘要:

MINOS是费米实验室的加速器中微子振荡实验。费米实验室产生了一束强烈的高能中微子束,并将其发送到费米实验室场地的近探测器和735公里外明尼苏达州北部苏丹矿的5千吨远探测器。该实验已经运行了几年,近探测器记录了数百万个事件,远探测器记录了数百个事件。我将报告这个实验的最新结果,包括对$|Δm^2_{32}|$的精确测量,对中性电流数据的分析以限制无菌中微子的成分,以及对$ν_μ\to ν_e$转换的研究。重点将放在$ν_μ\to ν_e$转换的数据分析上。使用数据从曝光的$3.14\times 10^{20}$质子在目标上,我们选择了电子类型的事件在近和远探测器。近探测器用于测量背景,该背景被外推到远探测器。我们在信号区发现了35个事件,背景预期值为$27\pm 5(stat)\pm 2(syst)$。利用这一观察结果,我们设定了90%的C. L。$δ_{cp} = 0$的$\sin^2 2 θ_{13} < 0.29$限值和正常质量等级。正在进行进一步分析,以减少背景和提高敏感性。

英文摘要:

MINOS is an accelerator neutrino oscillation experiment at Fermilab. An intense high energy neutrino beam is produced at Fermilab and sent to a near detector on the Fermilab site and also to a 5 kTon far detector 735 km away in the Soudan mine in northern Minnesota. The experiment has now had several years of running with millions of events in the near detector and hundreds of events recorded in the far detector. I will report on the recent results from this experiment which include precise measurement of $|Δm^2_{32}|$, ~analysis of neutral current data to limit the component of sterile neutrinos, and the search for $ν_μ\to ν_e$ conversion. The focus will be on the analysis of data for $ν_μ\to ν_e$ conversion. Using data from an exposure of $3.14\times 10^{20}$ protons on target, we have selected electron type events in both the near and the far detector. The near detector is used to measure the background which is extrapolated to the far detector. We have found 35 events in the signal region with a background expectation of $27\pm 5(stat)\pm 2(syst)$. Using this observation we set a 90% C.L. limit of $\sin^2 2 θ_{13} < 0.29$ for $δ_{cp} = 0$ and normal mass hierarchy. Further analysis is under way to reduce backgrounds and improve sensitivity.

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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