Search for massive neutrinos in \({\pi }^{+}{\rightarrow }e^{+}{\nu }_{e}\) decay

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• 作者：S. Ito ; A. Aguilar-Arevalo ; M. Aoki ; M. Blecher ; D. I. Britton…
• 关键词：Neutrino mixing ; Pion decay ; Weak interaction ; Precision measurement
• 刊名：Hyperfine Interactions
• 出版年：2017
• 出版时间：November 2017
• 年：2017
• 卷：238
• 期：1
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Nuclear Physics, Heavy Ions, Hadrons; Atomic, Molecular, Optical and Plasma Physics; Condensed Matter Physics; Surfaces and Interfaces, Thin Films;
• 出版者：Springer International Publishing
• ISSN：1572-9540
• 卷排序：238

文摘

The PIENU experiment aims to measure the branching ratio of the charged pion decay with precision of < 0.1 %. This measurement is much sensitive to search for massive neutrinos coupled to electrons in \({\pi }^{+}{\rightarrow }e^{+}{\nu }_{e}\) decay. The initial analysis was completed and the upper limit on the neutrino mixing parameter |U_ei|2 in the neutrino mass range of 0 to 55 MeV/c2 was improved by a factor of 1.5, and the sensitivity for the mass range of 68 to 129 MeV/c2 was improve by a factor of up to 4.