JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
First Measurement of Electron Neutrino Appearance in NOvA.
P Adamson, C Ader, M Andrews, N Anfimov, I Anghel, K Arms, E Arrieta-Diaz, A Aurisano, D S Ayres, C Backhouse, M Baird, B A Bambah, K Bays, R Bernstein, M Betancourt, V Bhatnagar, B Bhuyan, J Bian, K Biery, T Blackburn, V Bocean, D Bogert, A Bolshakova, M Bowden, C Bower, D Broemmelsiek, C Bromberg, G Brunetti, X Bu, A Butkevich, D Capista, E Catano-Mur, T R Chase, S Childress, B C Choudhary, B Chowdhury, T E Coan, J A B Coelho, M Colo, J Cooper, L Corwin, D Cronin-Hennessy, A Cunningham, G S Davies, J P Davies, M Del Tutto, P F Derwent, K N Deepthi, D Demuth, S Desai, G Deuerling, A Devan, J Dey, R Dharmapalan, P Ding, S Dixon, Z Djurcic, E C Dukes, H Duyang, R Ehrlich, G J Feldman, N Felt, E J Fenyves, E Flumerfelt, S Foulkes, M J Frank, W Freeman, M Gabrielyan, H R Gallagher, M Gebhard, T Ghosh, W Gilbert, A Giri, S Goadhouse, R A Gomes, L Goodenough, M C Goodman, V Grichine, N Grossman, R Group, J Grudzinski, V Guarino, B Guo, A Habig, T Handler, J Hartnell, R Hatcher, A Hatzikoutelis, K Heller, C Howcroft, J Huang, X Huang, J Hylen, M Ishitsuka, F Jediny, C Jensen, D Jensen, C Johnson, H Jostlein, G K Kafka, Y Kamyshkov, S M S Kasahara, S Kasetti, K Kephart, G Koizumi, S Kotelnikov, I Kourbanis, Z Krahn, V Kravtsov, A Kreymer, Ch Kulenberg, A Kumar, T Kutnink, R Kwarciancy, J Kwong, K Lang, A Lee, W M Lee, K Lee, S Lein, J Liu, M Lokajicek, J Lozier, Q Lu, P Lucas, S Luchuk, P Lukens, G Lukhanin, S Magill, K Maan, W A Mann, M L Marshak, M Martens, J Martincik, P Mason, K Matera, M Mathis, V Matveev, N Mayer, E McCluskey, R Mehdiyev, H Merritt, M D Messier, H Meyer, T Miao, D Michael, S P Mikheyev, W H Miller, S R Mishra, R Mohanta, A Moren, L Mualem, M Muether, S Mufson, J Musser, H B Newman, J K Nelson, E Niner, A Norman, J Nowak, Y Oksuzian, A Olshevskiy, J Oliver, T Olson, J Paley, P Pandey, A Para, R B Patterson, G Pawloski, N Pearson, D Perevalov, D Pershey, E Peterson, R Petti, S Phan-Budd, L Piccoli, A Pla-Dalmau, R K Plunkett, R Poling, B Potukuchi, F Psihas, D Pushka, X Qiu, N Raddatz, A Radovic, R A Rameika, R Ray, B Rebel, R Rechenmacher, B Reed, R Reilly, D Rocco, D Rodkin, K Ruddick, R Rusack, V Ryabov, K Sachdev, S Sahijpal, H Sahoo, O Samoylov, M C Sanchez, N Saoulidou, P Schlabach, J Schneps, R Schroeter, J Sepulveda-Quiroz, P Shanahan, B Sherwood, A Sheshukov, J Singh, V Singh, A Smith, D Smith, J Smolik, N Solomey, A Sotnikov, A Sousa, K Soustruznik, Y Stenkin, M Strait, L Suter, R L Talaga, M C Tamsett, S Tariq, P Tas, R J Tesarek, R B Thayyullathil, K Thomsen, X Tian, S C Tognini, R Toner, J Trevor, G Tzanakos, J Urheim, P Vahle, L Valerio, L Vinton, T Vrba, A V Waldron, B Wang, Z Wang, A Weber, A Wehmann, D Whittington, N Wilcer, R Wildberger, D Wildman, K Williams, S G Wojcicki, K Wood, M Xiao, T Xin, N Yadav, S Yang, S Zadorozhnyy, J Zalesak, B Zamorano, A Zhao, J Zirnstein, R ZwaskaWe report results from the first search for ν_{μ}→ν_{e} transitions by the NOvA experiment. In an exposure equivalent to 2.74×10^{20} 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<δ_{CP}<0.5π in the inverted mass hierarchy at the 90% C.L.
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