Improved measurement of neutrino oscillation parameters by the NOvA experiment
M. A. Acero, P. Adamson, L. Aliaga, Н. Анфимов, A. Antoshkin, E. Arrieta-Diaz, L. Asquith, A. Aurisano, H.O. Back, C. Backhouse, M. Baird, N. Balashov, Pierre Baldi, B. A. Bambah, S. Bashar, K. Bays, R. Bernstein, V. Bhatnagar, D. Bhattarai, B. Bhuyan, J. M. Bian, J. Blair, Andrew Booth, R. Bowles, C. Bromberg, N. Buchanan, A. Butkevich, S. Calvez, Timothy J. Carroll, E. Catano-Mur, B. C. Choudhary, A. Christensen, T. E. Coan, M. Colo, L. Cremonesi, G. S. Davies, P. F. Derwent, P. F. Ding, Z. Djurcic, M. Dolce, D. Doyle, D. Dueñas Tonguino, E. C. Dukes, Hongyue Duyang, R. Ehrlich, M. Elkins, E. Ewart, G. J. Feldman, P. Filip, J. Franc, M. J. Frank, H. Gallagher, R. P. Gandrajula, F. Gao, A. Giri, R. A. Gomes, M. C. Goodman, V. Grichine, M. Groh, R. Group, B. Guo, A. Habig, F. Hakl, A. Reinsvold Hall, J. Hartnell, R. Hatcher, Henry H. Hausner, M. He, K. Heller, J. Hewes, A. Himmel, A. Holin, J. Huang, B. Jargowsky, J. Jarosz, F. Jediny, C. A. Johnson, M. Judah, I. Kakorin, D. M. Kaplan, A. Kalitkina, R. Keloth, O. Klimov, L.W. Koerner, L. Kolupaeva, S.K. Kotelnikov, R. Kralik, Ch. Kullenberg, M. Kubu, Arun Kumar, C. Kuruppu, V. Kus, T. Lackey, K. Lang, P. Lasorak, J. Lesmeister, S. Lin, A. Lister, J. Liu, M. Lokajı́ček
Abstract
We present new e , , e , and oscillation measurements by the NOvA experiment, with a 50% increase in neutrino-mode beam exposure over the previously reported results. The additional data, combined with previously published neutrino and antineutrino data, are all analyzed using improved techniques and simulations. A joint fit to the e , , e , and candidate samples within the 3-flavor neutrino oscillation framework continues to yield a best-fit point in the normal mass ordering and the upper octant of the 23 mixing angle, with m 2 32 2.41 AE 0.07 10 -3 eV 2 and sin 2 23 0.57 0.03 -0.04 . The data disfavor combinations of oscillation parameters that give rise to a large asymmetry in the rates of e and e appearance. This includes values of the charge parity symmetry (CP) violating phase in the vicinity of CP =2 which are excluded by > 3 for the inverted mass ordering, and values around CP 3=2 in the normal ordering which are disfavored at 2 confidence.