Observation of Electron Neutrino Appearance in a Muon Neutrino Beam

Abe, K and T2K Collaboration (2014) Observation of Electron Neutrino Appearance in a Muon Neutrino Beam Physical Review Letters, 112 (6). 061802-. ISSN 0031-9007, 1079-7114

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Abstract

The T2K experiment has observed electron neutrino appearance in a muon neutrino beam produced 295 km from the Super-Kamiokande detector with a peak energy of 0.6 GeV. A total of 28 electron neutrino events were detected with an energy distribution consistent with an appearance signal, corresponding to a significance of 7.3σ when compared to 4.92 ± 0.55 expected background events. In the Pontecorvo-Maki-Nakagawa-Sakata mixing model, the electron neutrino appearance signal depends on several parameters including three mixing angles θ<inf>12</inf>, θ<inf>23</inf>, θ<inf>13</inf>, a mass difference Δm² <inf>32</inf>and a CP violating phase δ<inf>CP</inf>. In this neutrino oscillation scenario, assuming |Δm² <inf>32</inf>| = 2.4 × 10^-3eV², sin²θ<inf>23</inf>= 0.5, and Δm² <inf>32</inf>> 0 (Δm² <inf>32</inf>< 0), a best-fit value of sin²2θ<inf>13</inf>= 0.140^+0.038 <inf>-0.032</inf>(0.170^+0.045 <inf>-0.037</inf>) is obtained at δ<inf>CP</inf>= 0. When combining the result with the current best knowledge of oscillation parameters including the world average value of θ<inf>13</inf>from reactor experiments, some values of δ<inf>CP</inf>are disfavored at the 90% C.L.

Item Type:	Article
Additional Information:	8 pages, 6 figures
Uncontrolled Keywords:	T2K Collaboration
Depositing User:	Symplectic Admin
Date Deposited:	05 Apr 2016 14:19
Last Modified:	01 Mar 2026 10:06
DOI:	10.1103/PhysRevLett.112.061802
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3000014
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