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arXiv 1504.07086hep-ex
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T2K近探测器ND280中电子反中微子束流分量的测量

Measuring the electron anti-neutrino beam component in the T2K near detector ND280

Luke Southwell

摘要:

T2 K $ν_e$外观分析中的主要不可约背景是$ν_μ$射束中的$ν_e$污染。为了量化这一背景,选择充电电流$ν_e$相互作用在附近的检测器(ND 280)跟踪器区域开发相结合的粒子识别能力的时间投影室和电磁量热计。我们测量了光束的$ν_e$分量的数据/MC比$1.01 \pm 0.10$,这是对我们预期背景的预测的重要确认。2014年,T2K实验颠倒了磁喇叭的极性,并首次开始使用反中微子束运行。中微子和反中微子之间振荡几率的差异可能提供对轻子区CP破坏的深入了解。当前ND 280跟踪器$ν_e$充电电流选择已用作$\bar{ν_e}$充电电流选择的起点。电子反中微子选择的其他挑战和选择标准将被提出。

英文摘要:

The main irreducible background in the T2K $ν_e$ appearance analysis is the $ν_e$ contamination in the $ν_μ$ beam. In order to quantify this background, a selection for charged-current $ν_e$ interactions in the near detector (ND280) tracker region was developed by combining the particle identification abilities of the time projection chambers and electromagnetic calorimeters. We measured a data/MC ratio of $1.01 \pm 0.10$ for the $ν_e$ component of the beam which, is an important confirmation of our predictions of the expected backgrounds. In 2014 the T2K experiment reversed the polarity of the magnetic horns and began running with an antineutrino beam for the first time. Differences in the oscillation probabilities between neutrinos and antineutrinos may provide insight into CP violation in the leptonic sector. The current ND280 Tracker $ν_e$ charged-current selection has been used as a starting point for the $\bar{ν_e}$ charged-current selection. The additional challenges and selection criteria of the electron anti-neutrino selection will be presented.

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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