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Published August 1, 2018 | Published + Submitted
Journal Article Open

New constraints on oscillation parameters from ν_e appearance and ν_μ disappearance in the NOvA experiment


We present updated results from the NOvA experiment for ν_μ → ν_μ and ν_μ → ν_e oscillations from an exposure of 8.85×10^(20) protons on target, which represents an increase of 46% compared to our previous publication. The results utilize significant improvements in both the simulations and analysis of the data. A joint fit to the data for ν_μ disappearance and ν_e appearance gives the best-fit point as normal mass hierarchy, Δm^2_(32) = 2.44×10^(-3)  eV^2/c^4, sin^2 θ_(23) = 0.56, and δ_(CP) = 1.21π. The 68.3% confidence intervals in the normal mass hierarchy are Δm^2_(32) ∈ [2.37,2.52] × 10^(-3)  eV^2/c^4, sin^2 θ_(23) ∈ [0.43,0.51] ∪ [0.52,0.60], and δ_(CP) ∈ [0,0.12π] ∪ [0.91π,2π]. The inverted mass hierarchy is disfavored at the 95% confidence level for all choices of the other oscillation parameters.

Additional Information

© 2018 Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3. Received 1 June 2018; published 24 August 2018. 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; and the state and University of Minnesota. We are grateful for the contributions of the staffs at the University of Minnesota module assembly facility and Ash River Laboratory, Argonne National Laboratory, and Fermilab. Fermilab is operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the U.S. DOE.

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Submitted - 1806.00096.pdf

Published - PhysRevD.98.032012.pdf


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August 19, 2023
August 19, 2023