First muon-neutrino disappearance study with an off-axis beam



Abe, K, Abgrall, N, Ajima, Y, Aihara, H, Albert, JB, Andreopoulos, C ORCID: 0000-0003-2020-8215, Andrieu, B, Anerella, MD, Aoki, S, Araoka, O
et al (show 432 more authors) (2012) First muon-neutrino disappearance study with an off-axis beam PHYSICAL REVIEW D, 85 (3). 031103-. ISSN 1550-7998, 1550-2368

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Abstract

We report a measurement of muon-neutrino disappearance in the T2K experiment. The 295-km muon-neutrino beam from Tokai to Kamioka is the first implementation of the off-axis technique in a long-baseline neutrino oscillation experiment. With data corresponding to 1.43×1020 protons on target, we observe 31 fully-contained single μ-like ring events in Super-Kamiokande, compared with an expectation of 104±14(syst) events without neutrino oscillations. The best-fit point for two-flavor ν <inf>μ</inf>→ν <inf>τ</inf> oscillations is sin2(2θ <inf>23</inf>)=0.98 and |Δm322|=2.65×10 -3eV2. The boundary of the 90% confidence region includes the points ( sin2(2θ <inf>23</inf>), |Δm322|)=(1.0,3.1×10 -3eV2), (0.84, 2.65×10 -3eV2) and (1.0, 2.2×10 -3eV2). © 2012 American Physical Society.

Item Type: Article
Additional Information: 7 pages, 4 figures
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 08 Apr 2016 11:02
Last Modified: 16 Jun 2026 10:06
DOI: 10.1103/PhysRevD.85.031103
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3000085
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