Rights statement: © 2013 American Physical Society
Final published version, 7.67 MB, PDF document
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Evidence of electron neutrino appearance in a muon neutrino beam
AU - Abgrall, N.
AU - Aihara, H.
AU - Akiri, T.
AU - B. Albert, J.
AU - Andreopoulos, C.
AU - Aoki, S.
AU - Ariga, A.
AU - Ariga, T.
AU - Assylbekov, S.
AU - Autiero, D.
AU - Barbi, M.
AU - J. Barker, G.
AU - Barr, G.
AU - Bass, M.
AU - Batkiewicz, M.
AU - Bay, F.
AU - W. Bentham, S.
AU - Berardi, V.
AU - E. Berger, B.
AU - Berkman, S.
AU - Bertram, I.
AU - Beznosko, D.
AU - Bhadra, S.
AU - d. M. Blaszczyk, F.
AU - Blondel, A.
AU - Bojechko, C.
AU - Boyd, S.
AU - Brailsford, Dominic
AU - Bravar, A.
AU - Bronner, C.
AU - G. Brook-Roberge, D.
AU - Buchanan, N.
AU - G. Calland, R.
AU - Caravaca Rodriguez, J.
AU - L. Cartwright, S.
AU - Castillo, R.
AU - G. Catanesi, M.
AU - Cervera, A.
AU - Cherdack, D.
AU - Christodoulou, G.
AU - Clifton, A.
AU - Coleman, J.
AU - Dealtry, Thomas
AU - J. Finch, A.
AU - Grant, N.
AU - L. Kormos, L.
AU - O'Keeffe, Helen
AU - N. Ratoff, P.
AU - Reeves, M.
AU - Southwell, L.
AU - T2K Collaboration
N1 - 41 pages, 41 figures © 2013 American Physical Society
PY - 2013/8/5
Y1 - 2013/8/5
N2 - The T2K collaboration reports evidence for electron neutrino appearance at the atmospheric mass splitting, |\Delta m_{32}^2|=2.4x10^{-3} eV^2. An excess of electron neutrino interactions over background is observed from a muon neutrino beam with a peak energy of 0.6 GeV at the Super-Kamiokande (SK) detector 295 km from the beam's origin. Signal and background predictions are constrained by data from near detectors located 280 m from the neutrino production target. We observe 11 electron neutrino candidate events at the SK detector when a background of 3.3\pm0.4(syst.) events is expected. The background-only hypothesis is rejected with a p-value of 0.0009 (3.1\sigma), and a fit assuming \nu_{\mu}->\nu_e oscillations with sin^2(2\theta_{23})=1, \delta_{CP}=0 and |\Delta m_{32}^2|=2.4x10^{-3} eV^2 yields sin^2(2\theta_{13})=0.088^{+0.049}_{-0.039}(stat.+syst.).
AB - The T2K collaboration reports evidence for electron neutrino appearance at the atmospheric mass splitting, |\Delta m_{32}^2|=2.4x10^{-3} eV^2. An excess of electron neutrino interactions over background is observed from a muon neutrino beam with a peak energy of 0.6 GeV at the Super-Kamiokande (SK) detector 295 km from the beam's origin. Signal and background predictions are constrained by data from near detectors located 280 m from the neutrino production target. We observe 11 electron neutrino candidate events at the SK detector when a background of 3.3\pm0.4(syst.) events is expected. The background-only hypothesis is rejected with a p-value of 0.0009 (3.1\sigma), and a fit assuming \nu_{\mu}->\nu_e oscillations with sin^2(2\theta_{23})=1, \delta_{CP}=0 and |\Delta m_{32}^2|=2.4x10^{-3} eV^2 yields sin^2(2\theta_{13})=0.088^{+0.049}_{-0.039}(stat.+syst.).
KW - ABSORPTION CROSS-SECTIONS
KW - MOMENTUM RANGE
KW - GEV-C
KW - T2K EXPERIMENT
KW - ENERGY-RANGE
KW - NUCLEI
KW - DETECTOR
KW - PROTONS
KW - FLUX
KW - PIONS
UR - http://www.scopus.com/inward/record.url?scp=84883472068&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.88.032002
DO - 10.1103/PhysRevD.88.032002
M3 - Journal article
VL - 88
JO - Physical Review D
JF - Physical Review D
SN - 1550-7998
IS - 3
M1 - 032002
ER -