Joint neutrino oscillation analysis from the T2K and NOvA experiments

Abstract

The landmark discovery that neutrinos have mass and can change type (or "flavor") as they propagate -- a process called neutrino oscillation -- has opened up a rich array of theoretical and experimental questions being actively pursued today. Neutrino oscillation remains the most powerful experimental tool for addressing many of these questions, including whether neutrinos violate charge-parity (CP) symmetry, which has possible connections to the unexplained preponderance of matter over antimatter in the universe. Oscillation measurements also probe the mass-squared differences between the different neutrino mass states ($\Delta m^2$), whether there are two light states and a heavier one (normal ordering) or vice versa (inverted ordering), and the structure of neutrino mass and flavor mixing. Here, we carry out the first joint analysis of data sets from NOvA and T2K, the two currently operating long-baseline neutrino oscillation experiments (hundreds of kilometers of neutrino travel distance), taking advantage of our complementary experimental designs and setting new constraints on several neutrino sector parameters. This analysis provides new precision on the $\Delta m_{32}^2$ mass difference, finding $2.43_{-0.03}^{+0.04}\left(-2.48_{-0.04}^{+0.03}\right)\times 10^{-3}{\mathrm{eV}}^2$ in the normal (inverted) ordering, as well as a $3\sigma$ interval on ${\delta }_{\mathrm{CP}}$ of $[-1.38\pi ,0.30\pi ]$ $\left([-0.92\pi ,-0.04\pi ]\right)$ in the normal (inverted) ordering. The data show no strong preference for either mass ordering, but notably if inverted ordering were assumed true within the three-flavor mixing paradigm, then our results would provide evidence of CP symmetry violation in the lepton sector.

25 pages, 13 figures

References in corpus (36)

• Evidence for oscillation of atmospheric neutrinos
• Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory
• First Results from KamLAND: Evidence for Reactor Anti-Neutrino Disappearance
• Observation of electron-antineutrino disappearance at Daya Bay
• Measurement of the rate of nu_e + d --> p + p + e^- interactions produced by 8B solar neutrinos at the Sudbury Neutrino Observatory
• The fate of hints: updated global analysis of three-flavor neutrino oscillations
• The GENIE Neutrino Monte Carlo Generator
• The T2K Experiment
• Determination of Solar Neutrino Oscillation Parameters using 1496 Days of Super-Kamiokande-I Data
• Leptogenesis as the origin of matter
• Neutrinoless Double-Beta Decay: Status and Prospects
• Theory of Neutrinos: A White Paper
• The NuMI Neutrino Beam
• A Convolutional Neural Network Neutrino Event Classifier
• The T2K Neutrino Flux Prediction
• Neutrino mass from Cosmology
• Leptonic CP violation
• An Improved Measurement of Neutrino Oscillation Parameters by the NOvA Experiment
• First Double Chooz ${\theta }_{13}$ Measurement via Total Neutron Capture Detection
• Connecting Low Energy Leptonic CP-violation to Leptogenesis
• Neutrino Flux Predictions for the NuMI Beam
• What can be learned from a future supernova neutrino detection?
• Inclusive production of charged pions in p+C collisions at 158 GeV/c beam momentum
• Differences in Quasi-Elastic Cross-Sections of Muon and Electron Neutrinos
• The NEUT Neutrino Interaction Simulation
• Low-energy excitations and quasielastic contribution to electron-nucleus and neutrino-nucleus scattering in the continuum random phase approximation
• Direct Measurements of Neutrino Mass
• Precision constraints for three-flavor neutrino oscillations from the full MINOS+ and MINOS data set
• Tuning the GENIE Pion Production Model with MINERvA Data
• CP Violation in the Lepton Sector and Implications for Leptogenesis
• Using world charged pion--nucleus scattering data to constrain an intranuclear cascade model
• Atmospheric neutrino oscillation analysis with neutron tagging and an expanded fiducial volume in Super-Kamiokande I-V
• Timing the Neutrino Signal of a Galactic Supernova
• Expanding neutrino oscillation parameter measurements in NOvA using a Bayesian approach
• A Mass Ordering Sum Rule for the Neutrino Disappearance Channels in T2K, NOvA and JUNO
• Measurement of Electron Antineutrino Oscillation Amplitude and Frequency via Neutron Capture on Hydrogen at Daya Bay

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• Update on non-unitary mixing in the recent NO$\nu$A and T2K data
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• Quantum field theory treatment of oscillations of Dirac neutrinos in external fields
• Predictions of the neutrino oscillations parameters