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First measurement of electron neutrino appearance in NOvA

  • Author(s): Adamson, P
  • Ader, C
  • Andrews, M
  • Anfimov, N
  • Anghel, I
  • Arms, K
  • Arrieta-Diaz, E
  • Aurisano, A
  • Ayres, DS
  • Backhouse, C
  • Baird, M
  • Bambah, BA
  • Bays, K
  • Bernstein, R
  • Betancourt, M
  • Bhatnagar, V
  • Bhuyan, B
  • Bian, J
  • Biery, K
  • Blackburn, T
  • Bocean, V
  • Bogert, D
  • Bolshakova, A
  • Bowden, M
  • Bower, C
  • Broemmelsiek, D
  • Bromberg, C
  • Brunetti, G
  • Bu, X
  • Butkevich, A
  • Capista, D
  • Catano-Mur, E
  • Chase, TR
  • Childress, S
  • Choudhary, BC
  • Chowdhury, B
  • Coan, TE
  • Coelho, JAB
  • Colo, M
  • Cooper, J
  • Corwin, L
  • Cronin-Hennessy, D
  • Cunningham, A
  • Davies, GS
  • Davies, JP
  • Del Tutto, M
  • Derwent, PF
  • Deepthi, KN
  • Demuth, D
  • Desai, S
  • Deuerling, G
  • Devan, A
  • Dey, J
  • Dharmapalan, R
  • Ding, P
  • Dixon, S
  • Djurcic, Z
  • Dukes, EC
  • Duyang, H
  • Ehrlich, R
  • Feldman, GJ
  • Felt, N
  • Fenyves, EJ
  • Flumerfelt, E
  • Foulkes, S
  • Frank, MJ
  • Freeman, W
  • Gabrielyan, M
  • Gallagher, HR
  • Gebhard, M
  • Ghosh, T
  • Gilbert, W
  • Giri, A
  • Goadhouse, S
  • Gomes, RA
  • Goodenough, L
  • Goodman, MC
  • Grichine, V
  • Grossman, N
  • Group, R
  • Grudzinski, J
  • Guarino, V
  • Guo, B
  • Habig, A
  • Handler, T
  • Hartnell, J
  • Hatcher, R
  • Hatzikoutelis, A
  • Heller, K
  • Howcroft, C
  • Huang, J
  • Huang, X
  • Hylen, J
  • Ishitsuka, M
  • Jediny, F
  • Jensen, C
  • Jensen, D
  • Johnson, C
  • Jostlein, H
  • et al.
Abstract

© 2016 American Physical Society. We report results from the first search for νμ→νe transitions by the NOvA experiment. In an exposure equivalent to 2.74×1020 protons on target in the upgraded NuMI beam at Fermilab, we observe 6 events in the Far Detector, compared to a background expectation of 0.99±0.11(syst) events based on the Near Detector measurement. A secondary analysis observes 11 events with a background of 1.07±0.14(syst). The 3.3σ excess of events observed in the primary analysis disfavors 0.1π<δCP<0.5π in the inverted mass hierarchy at the 90% C.L.

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