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-.

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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 10**20 protons on target, we observe 31 fully-contained single muon-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 nu_mu -> nu_tau oscillations is sin**2(2 theta_23) = 0.98 and |\Delta m**2_32| = 2.65 10**-3 eV**2. The boundary of the 90 % confidence region includes the points (sin**2(2 theta_23),|\Delta m**2_32|) = (1.0, 3.1 10**-3 eV**2), (0.84, 2.65 10**-3 eV**2) and (1.0, 2.2 10**-3 eV**2).

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 Dec 2022 16:16
DOI: 10.1103/PhysRevD.85.031103
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