TY  - JOUR
AU  - T2K Collaboration (Abe, K. et al
AU  - Cervera-Villanueva, A.
AU  - Escudero, L.
AU  - Gomez-Cadenas, J. J.
AU  - Hansen, C.
AU  - Monfregola, L.
AU  - Sorel, M.
AU  - Stamoulis, P.
PY  - 2012
DA  - 2012//
TI  - First muon-neutrino disappearance study with an off-axis beam
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 031103
EP  - 8pp
VL  - 85
IS  - 3
PB  - Amer Physical Soc
AB  - 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 x 10(20) protons on target, we observe 31 fully-contained single mu-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 vertical bar Delta m(32)(2)vertical bar = 2.65 x 10(-3) eV(2). The boundary of the 90% confidence region includes the points sin(2)(2 theta(23)), vertical bar Delta m(32)(2)vertical bar = (1.0, 3.1 x 10(-3) eV(2)), (0.84, 2.65 x 10(-3) eV(2)) and (1.0, 2.2 x 10(-3) eV(2)).
SN  - 1550-7998
UR  - http://arxiv.org/abs/1201.1386
UR  - https://doi.org/10.1103/PhysRevD.85.031103
DO  - 10.1103/PhysRevD.85.031103
LA  - English
N1  - WOS:000300570300001
ID  - T2KCollaborationAbe_etal2012
ER  -