Observation of ν_e Appearance in T2K Experiment

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Other Title
  • 長基線ニュートリノ振動実験T2Kによるν_μ→ν_e振動の発見 （解説）
  • 長基線ニュートリノ振動実験T2Kによる ν[μ]→ν[e]振動の発見
  • チョウキセン ニュートリノ シンドウ ジッケン T2K ニ ヨル   n[m]→ n[e]シンドウ ノ ハッケン

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Abstract

Neutrino oscillation, a phenomenon where a certain flavor neutrino can later be measured as a different flavor neutrino, is an important research subject in the particle physics. In Tokai-to-Kamioka long baseline neutrino oscillation experiment (T2K), our primary motivation is (1) observation of ν_μ→ν_e oscillation (ν_e appearance) and (2) precise measurement of ν_μ→ν_x oscillation (ν_μ disappearance). Recently, there is a significant progress on the understanding of neutrino oscillation. T2K experiment reported the indication of ν_μ→ν_e oscillation in 2011, and subsequently the value of mixing angle, θ_<13>, which was the last parameter describing the neutrino oscillation model, was determined by several experiments using reactor neutrinos in 2012. T2K experiment also established the ν_μ→ν_e in this year. We now go toward remaining subjects on neutrino physics such as a discovery of CP violation in lepton sector and a determination of mass hierarchy by neutrino oscillation experiments. We report the recent results of ν_e appearance and ν_μ disappearance and future prospects in T2K experiment.

Journal

  • Butsuri

    Butsuri 69 (4), 204-212, 2014-04-05

    The Physical Society of Japan

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