T2K Collaboration (Including: Barker, Gary John, Boyd, Steve B., Carver, A., Hadley, David R., Harrison, P. F., Ilić, Jelena, Lister, Callum, Litchfield, R. P., Morgan, B. (Ben), Scully, D. I. and Whitehead, Leigh). (2012) First muon-neutrino disappearance study with an off-axis beam. Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 85 (Number 3). Article number 031103. doi:10.1103/PhysRevD.85.031103

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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 μ→ν τ oscillations is sin2(2θ 23)=0.98 and |Δm322|=2.65×10 -3eV2. The boundary of the 90% confidence region includes the points ( sin2(2θ 23), |Δm322|)=(1.0,3.1×10 -3eV2), (0.84, 2.65×10 -3eV2) and (1.0, 2.2×10 -3eV2).

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Muons, Neutrinos, Particle beams
Journal or Publication Title:	Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher:	American Physical Society
ISSN:	1550-7998
Official Date:	22 February 2012
Dates:	Date Event 22 February 2012 Published
Volume:	Volume 85
Number:	Number 3
Article Number:	Article number 031103
DOI:	10.1103/PhysRevD.85.031103
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
Funder:	Japan. Monbushō, Natural Sciences and Engineering Research Council of Canada (NSERC), National Research Council Canada (NRCC), Canada Foundation for Innovation (CFI), France. Commissariat à l'énergie atomique (CEA), Centre national de la recherche scientifique (France) (CNRS), Institut national de physique nucléaire et de physique des particules (IN2P3), Deutsche Forschungsgemeinschaft (DFG), Istituto nazionale di fisica nucleare (INFN), Poland. Ministerstwo Nauki i Szkolnictwa Wyższego [Ministry of Science and Higher Education] (MNiSW), Rossiĭskai︠a︡ akademii︠a︡ nauk [Russian Academy of Sciences] (RAN), Rossiĭskiĭ fond fundamentalʹnykh issledovaniĭ [Russian Foundation for Basic Research] (RFBR), Russia (Federation). Ministerstvo obrazovanii︠a︡ i nauki [Ministry of Education and Science], Korea (South). Kyoyuk Kwahak Kisulbu [Ministry of Education, Science and Technology] (MEST), National Research Foundation of Korea (NRF), Spain. Ministerio de Ciencia e Innovación (MICINN), Centro Nacional de Física de Partículas, Astropartículas y Nuclear (CPAN), Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung [Swiss National Science Foundation] (SNSF), Switzerland. Staatssekretariat für Ausbildung und Forschung (SER), Science and Technology Facilities Council (Great Britain) (STFC), National Science Foundation (U.S.) (NSF), United States. Department of Energy, Seventh Framework Programme (European Commission) (FP7), Nihon Gakujutsu Shinkōkai [Japan Society for the Promotion of Sciences] (JSPS), Royal Society (Great Britain), Alfred P. Sloan Foundation

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