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Observation of nue appearance from an off-axis nu mu beam utilizing the neutrino energy spectrum.

机译:利用中微子能谱从离轴nu mu束中观察到球的出现。

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摘要

T2K (Tokai to Kamiokande) is a long baseline neutrino experiment located in Japan. It uses a 30 GeV proton beam at the J-PARC accelerator in Tokai to produce an intense off-axis muon neutrino beam that travels 295 km through the Earth to Super-Kamiokande. One of its primary goals is to measure neutrino oscillation parameters by directly detecting nue at Super-Kamiokande that have oscillated from the numu beam. The measurement of numu → nue oscillations are of a particular interest because this mode is sensitive to both mixing angle theta 13 and CP phase deltaCP of the PMNS matrix. Precise measurement of numu → nue allows us to explore the possibility of CP violation in the lepton sector.;This dissertation will describe the recent 2013 nue appearance oscillation analysis using the reconstructed neutrino energy spectrum by means of a maximum likelihood fit. The data used for this analysis corresponds to 6.57 x 1020 POT. A total of 28 nu e candidate events were observed, corresponding to a 7.2 sigma significance of nue appearance by non-zero theta13. These results are then combined with the world average value of theta13 from reactor experiments and some values of deltaCP are disfavored at the 90% CL.
机译:T2K(Tokai到Kamiokande)是位于日本的长期基线中微子实验。它在东海的J-PARC加速器上使用30 GeV质子束产生强烈的离轴介子中微子束,该束中子穿过地球295公里到达超级神冈。它的主要目标之一是通过直接检测从超音速束中振荡出的超神冈处的中子来测量中微子的振荡参数。数字振动→nue振动的测量特别受关注,因为该模式对PMNS矩阵的混合角θ13和CP相位deltaCP都敏感。精确测量numu→nue使我们能够探索轻子区域中CP违规的可能性。本论文将通过重构的中微子能谱通过最大似然拟合描述最近的2013年nue出现振荡分析。用于此分析的数据对应于6.57 x 1020 POT。总共观察到28个新的候选事件,对应于非零theta13出现的7.2σ显着性。然后将这些结果与来自反应堆实验的theta13的世界平均值相结合,并且在90%的CL下不利于deltaCP的某些值。

著录项

  • 作者

    Hignight, Joshua.;

  • 作者单位

    State University of New York at Stony Brook.;

  • 授予单位 State University of New York at Stony Brook.;
  • 学科 Physics Elementary Particles and High Energy.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 154 p.
  • 总页数 154
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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