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arxiv 1601.05022 v2 pith:QBXOZOX6 submitted 2016-01-19 hep-ex physics.ins-det

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
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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. Zwaska (the NOvA Collaboration)
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classification hep-ex physics.ins-det
keywords eventsanalysisbackgrounddetectorfirstmeasurementnovasyst
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We report results from the first search for $\nu_\mu\to\nu_e$ transitions by the NOvA experiment. In an exposure equivalent to $2.74\times10^{20}$ protons-on-target in the upgraded NuMI beam at Fermilab, we observe 6 events in the Far Detector, compared to a background expectation of $0.99\pm0.11$ (syst.) events based on the Near Detector measurement. A secondary analysis observes 11 events with a background of $1.07\pm0.14$ (syst.). The $3.3\sigma$ excess of events observed in the primary analysis disfavors $0.1\pi < \delta_{CP} < 0.5\pi$ in the inverted mass hierarchy at the 90% C.L.

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