TY  - JOUR
AU  - T2K Collaboration (Abe, K. et al
AU  - Cervera-Villanueva, A.
AU  - Escudero, L.
AU  - Izmaylov, A.
AU  - Monfregola, L.
AU  - Sorel, M.
AU  - Stamoulis, P.
PY  - 2014
DA  - 2014//
TI  - Precise Measurement of the Neutrino Mixing Parameter theta(23) from Muon Neutrino Disappearance in an Off-Axis Beam
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 181801
EP  - 8pp
VL  - 112
IS  - 18
PB  - Amer Physical Soc
AB  - New data from the T2K neutrino oscillation experiment produce the most precise measurement of the neutrino mixing parameter theta(23). Using an off-axis neutrino beam with a peak energy of 0.6 GeV and a data set corresponding to 6.57 x 10(20) protons on target, T2K has fit the energy-dependent nu(mu) oscillation probability to determine oscillation parameters. The 68% confidence limit on sin(2)(theta(23)) is 0.514(-0.056)(+0.055) (0.511 +/- 0.055), assuming normal (inverted) mass hierarchy. The best-fit mass-squared splitting for normal hierarchy is Delta m(32)(2) = (2.51 +/- 0.10) x 10(-3) eV(2)/c(4) (inverted hierarchy: Delta m(13)(2) = (2.48 +/- 0.10) x 10(-3) eV(2)/c(4)). Adding a model of multinucleon interactions that affect neutrino energy reconstruction is found to produce only small biases in neutrino oscillation parameter extraction at current levels of statistical uncertainty.
SN  - 0031-9007
UR  - http://arxiv.org/abs/1403.1532
UR  - https://doi.org/10.1103/PhysRevLett.112.181801
DO  - 10.1103/PhysRevLett.112.181801
LA  - English
N1  - WOS:000339629400005
ID  - T2KCollaborationAbe_etal2014
ER  -