Abstract
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 e i |2 in the neutrino mass range of 0 to 55 MeV/c 2 was improved by a factor of 1.5, and the sensitivity for the mass range of 68 to 129 MeV/c 2 was improve by a factor of up to 4.
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This article is part of the Topical Collection on Proceedings of the 6th International Symposium on Symmetries in Subatomic Physics (SSP 2015), Victoria, Canada, 8-12 June 2015
Edited by Michael Gericke and Gerald Gwinner
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Ito, S., Aguilar-Arevalo, A., Aoki, M. et al. Search for massive neutrinos in \({\pi }^{+}{\rightarrow }e^{+}{\nu }_{e}\) decay. Hyperfine Interact 238, 1 (2017). https://doi.org/10.1007/s10751-016-1375-5
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DOI: https://doi.org/10.1007/s10751-016-1375-5