First measurement of neutrino oscillation parameters using neutrinos and antineutrinos by NOvA

M. A. Acero, P. Adamson, L. Aliaga, T. Alion, V. Allakhverdian, S. Altakarli, N. Anfimov, A. Antoshkin, A. Aurisano, A. Back, C. Backhouse, M. Baird, N. Balashov, P. Baldi, B. A. Bambah, S. Bashar, K. Bays, S. Bending, R. Bernstein, V. BhatnagarB. Bhuyan, J. Bian, T. Blackburn, J. Blair, A. C. Booth, P. Bour, C. Bromberg, N. Buchanan, A. Butkevich, S. Calvez, M. Campbell, T. J. Carroll, E. Catano-Mur, A. Cedeno, S. Childress, B. C. Choudhary, B. Chowdhury, T. E. Coan, M. Colo, J. Cooper, L. Corwin, L. Cremonesi, G. S. Davies, P. F. Derwent, P. Ding, Z. Djurcic, D. Doyle, E. C. Dukes, H. Duyang, S. Edayath, R. Ehrlich, M. Elkins, G. J. Feldman, P. Filip, W. Flanagan, M. J. Frank, H. R. Gallagher, R. Gandrajula, F. Gao, S. Germani, A. Giri, R. A. Gomes, M. C. Goodman, V. Grichine, M. Groh, R. Group, B. Guo, A. Habig, F. Hakl, J. Hartnell, R. Hatcher, A. Hatzikoutelis, K. Heller, J. Hewes, A. Himmel, A. Holin, B. Howard, J. Huang, J. Hylen, F. Jediny, C. Johnson, M. Judah, I. Kakorin, D. Kalra, D. M. Kaplan, R. Keloth, O. Klimov, L. W. Koerner, L. Kolupaeva, S. Kotelnikov, I. Kourbanis, A. Kreymer, Ch Kulenberg, A. Kumar, C. D. Kuruppu, V. Kus, T. Lackey, K. Lang, S. Lin, M. Lokajicek, J. Lozier, S. Luchuk, K. Maan, S. Magill, W. A. Mann, M. L. Marshak, M. Martinez-Casales, V. Matveev, D. P. Méndez, M. D. Messier, H. Meyer, T. Miao, W. H. Miller, S. R. Mishra, A. Mislivec, R. Mohanta, A. Moren, L. Mualem, M. Muether, S. Mufson, K. Mulder, R. Murphy, J. Musser, D. Naples, N. Nayak, J. K. Nelson, R. Nichol, G. Nikseresht, E. Niner, A. Norman, T. Nosek, A. Olshevskiy, T. Olson, J. Paley, R. B. Patterson, G. Pawloski, D. Pershey, O. Petrova, R. Petti, D. D. Phan, R. K. Plunkett, B. Potukuchi, C. Principato, F. Psihas, A. Radovic, V. Raj, R. A. Rameika, B. Rebel, P. Rojas, V. Ryabov, O. Samoylov, M. C. Sanchez, S. Sánchez Falero, I. S. Seong, P. Shanahan, A. Sheshukov, P. Singh, V. Singh, E. Smith, J. Smolik, P. Snopok, N. Solomey, E. Song, A. Sousa, K. Soustruznik, M. Strait, L. Suter, A. Sutton, R. L. Talaga, B. Tapia Oregui, P. Tas, R. B. Thayyullathil, J. Thomas, E. Tiras, D. Torbunov, J. Tripathi, A. Tsaris, Y. Torun, J. Urheim, P. Vahle, J. Vasel, L. Vinton, P. Vokac, T. Vrba, M. Wallbank, B. Wang, T. K. Warburton, M. Wetstein, M. While, D. Whittington, S. G. Wojcicki, J. Wolcott, N. Yadav, A. Yallappa Dombara, K. Yonehara, S. Yu, S. Zadorozhnyy, J. Zalesak, B. Zamorano, R. Zwaska

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Abstract

The NOvA experiment has seen a 4.4σ signal of ν̄e appearance in a 2 GeV ν̄μ beam at a distance of 810 km. Using 12.33×1020 protons on target delivered to the Fermilab NuMI neutrino beamline, the experiment recorded 27 ν̄μ→ν̄e candidates with a background of 10.3 and 102 ν̄μ→ν̄μ candidates. This new antineutrino data are combined with neutrino data to measure the parameters |Δm322|=2.48-0.06+0.11×10-3 eV2/c4 and sin2θ23 in the ranges from (0.53-0.60) and (0.45-0.48) in the normal neutrino mass hierarchy. The data exclude most values near δCP=π/2 for the inverted mass hierarchy by more than 3σ and favor the normal neutrino mass hierarchy by 1.9σ and θ23 values in the upper octant by 1.6σ.

Original languageEnglish (US)
Article number151803
JournalPhysical review letters
Volume123
Issue number15
DOIs
StatePublished - Oct 11 2019

Bibliographical note

Funding Information:
We are grateful to Stephen Parke (FNAL) for useful discussions. This document was prepared by the NOvA collaboration using the resources of the Fermi National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359. This work was supported by the U.S. Department of Energy; the U.S. National Science Foundation; the Department of Science and Technology, India; the European Research Council; the MSMT CR, GA UK, Czech Republic; the RAS, RFBR, RMES, RSF, and BASIS Foundation, Russia; CNPq and FAPEG, Brazil; STFC, and the Royal Society, United Kingdom; and the state and University of Minnesota. This work used resources of the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility operated under Contract No. DE-AC02-05CH11231. We are grateful for the contributions of the staffs of the University of Minnesota at the Ash River Laboratory and of Fermilab.

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