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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;
  • Kafka, GK;
  • Kamyshkov, Y;
  • Kasahara, SMS;
  • Kasetti, S;
  • Kephart, K;
  • Koizumi, G;
  • Kotelnikov, S;
  • Kourbanis, I;
  • Krahn, Z;
  • Kravtsov, V;
  • Kreymer, A;
  • Kulenberg, Ch;
  • Kumar, A;
  • Kutnink, T;
  • Kwarciancy, R;
  • Kwong, J;
  • Lang, K;
  • Lee, A;
  • Lee, WM;
  • Lee, K;
  • Lein, S;
  • Liu, J;
  • Lokajicek, M;
  • Lozier, J;
  • Lu, Q;
  • Lucas, P;
  • Luchuk, S;
  • Lukens, P;
  • Lukhanin, G;
  • Magill, S;
  • Maan, K;
  • Mann, WA;
  • Marshak, ML;
  • Martens, M;
  • Martincik, J;
  • Mason, P;
  • Matera, K;
  • Mathis, M;
  • Matveev, V;
  • Mayer, N;
  • McCluskey, E;
  • Mehdiyev, R;
  • Merritt, H;
  • Messier, MD;
  • Meyer, H;
  • Miao, T;
  • Michael, D;
  • Mikheyev, SP;
  • Miller, WH;
  • Mishra, SR;
  • Mohanta, R;
  • Moren, A;
  • Mualem, L;
  • Muether, M;
  • Mufson, S;
  • Musser, J;
  • Newman, HB;
  • Nelson, JK;
  • Niner, E;
  • Norman, A;
  • Nowak, J;
  • Oksuzian, Y;
  • Olshevskiy, A;
  • Oliver, J;
  • Olson, T;
  • Paley, J;
  • Pandey, P;
  • Para, A;
  • Patterson, RB;
  • Pawloski, G;
  • Pearson, N;
  • Perevalov, D;
  • Pershey, D;
  • Peterson, E;
  • Petti, R;
  • Phan-Budd, S;
  • Piccoli, L;
  • Pla-Dalmau, A;
  • Plunkett, RK;
  • Poling, R;
  • Potukuchi, B;
  • Psihas, F;
  • Pushka, D;
  • Qiu, X;
  • Raddatz, N;
  • Radovic, A;
  • Rameika, RA;
  • Ray, R;
  • Rebel, B;
  • Rechenmacher, R;
  • Reed, B;
  • Reilly, R;
  • Rocco, D;
  • Rodkin, D;
  • Ruddick, K;
  • Rusack, R;
  • Ryabov, V;
  • Sachdev, K;
  • Sahijpal, S;
  • Sahoo, H;
  • Samoylov, O;
  • Sanchez, MC;
  • Saoulidou, N;
  • Schlabach, P;
  • Schneps, J;
  • Schroeter, R;
  • Sepulveda-Quiroz, J;
  • Shanahan, P;
  • Sherwood, B;
  • Sheshukov, A;
  • Singh, J;
  • Singh, V;
  • Smith, A;
  • Smith, D;
  • Smolik, J;
  • Solomey, N;
  • Sotnikov, A;
  • Sousa, A;
  • Soustruznik, K;
  • Stenkin, Y;
  • Strait, M;
  • Suter, L;
  • Talaga, RL;
  • Tamsett, MC;
  • Tariq, S;
  • Tas, P;
  • Tesarek, RJ;
  • Thayyullathil, RB;
  • Thomsen, K;
  • Tian, X;
  • Tognini, SC;
  • Toner, R;
  • Trevor, J;
  • Tzanakos, G;
  • Urheim, J;
  • Vahle, P;
  • Valerio, L;
  • Vinton, L;
  • Vrba, T;
  • Waldron, AV;
  • Wang, B;
  • Wang, Z;
  • Weber, A;
  • Wehmann, A;
  • Whittington, D;
  • Wilcer, N;
  • Wildberger, R;
  • Wildman, D;
  • Williams, K;
  • Wojcicki, SG;
  • Wood, K;
  • Xiao, M;
  • Xin, T;
  • Yadav, N;
  • Yang, S;
  • Zadorozhnyy, S;
  • Zalesak, J;
  • Zamorano, B;
  • Zhao, A;
  • Zirnstein, J;
  • Zwaska, R;
  • NOvA Collaboration
  • et al.
Abstract

We 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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