Measurements of neutrino oscillation parameters from the T2K experiment using $3.6\times 10^{21}$ protons on target

Abstract

The T2K experiment presents new measurements of neutrino oscillation parameters using $19.7(16.3)\times 10^{20}$ protons on target (POT) in (anti-)neutrino mode at the far detector (FD). Compared to the previous analysis, an additional $4.7\times 10^{20}$ POT neutrino data was collected at the FD. Significant improvements were made to the analysis methodology, with the near-detector analysis introducing new selections and using more than double the data. Additionally, this is the first T2K oscillation analysis to use NA61/SHINE data on a replica of the T2K target to tune the neutrino flux model, and the neutrino interaction model was improved to include new nuclear effects and calculations. Frequentist and Bayesian analyses are presented, including results on ${\sin }^2{\theta }_{13}$ and the impact of priors on the ${\delta }_{\mathrm{CP}}$ measurement. Both analyses prefer the normal mass ordering and upper octant of ${\sin }^2{\theta }_{23}$ with a nearly maximally CP-violating phase. Assuming the normal ordering and using the constraint on ${\sin }^2{\theta }_{13}$ from reactors, ${\sin }^2{\theta }_{23}=0.561_{-0.032}^{+0.021}$ using Feldman--Cousins corrected intervals, and $\Delta m_{32}^2=2.494_{-0.058}^{+0.041}\times 10^{-3}\mathrm{e}{\mathrm{V}}^2$ using constant $\Delta {\chi }^2$ intervals. The CP-violating phase is constrained to ${\delta }_{\mathrm{CP}}=-1.97_{-0.70}^{+0.97}$ using Feldman--Cousins corrected intervals, and ${\delta }_{\mathrm{CP}}=0,\pi$ is excluded at more than 90% confidence level. A Jarlskog invariant of zero is excluded at more than $2\sigma$ credible level using a flat prior in ${\delta }_{\mathrm{CP}}$, and just below $2\sigma$ using a flat prior in $\sin {\delta }_{\mathrm{CP}}$. When the external constraint on ${\sin }^2{\theta }_{13}$ is removed, ${\sin }^2{\theta }_{13}=28.0_{-6.5}^{+2.8}\times 10^{-3}$, in agreement with measurements from reactor experiments. These results are consistent with previous T2K analyses.

References in corpus (22)

• Observation of electron-antineutrino disappearance at Daya Bay
• Indication of Electron Neutrino Appearance from an Accelerator-produced Off-axis Muon Neutrino Beam
• Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with 6.6E20 protons on target
• A new parameterization of the nucleon elastic form factors
• The T2K Neutrino Flux Prediction
• An Improved Measurement of Neutrino Oscillation Parameters by the NOvA Experiment
• Measurement of neutrino and antineutrino oscillations by the T2K experiment including a new additional sample of ${\nu }_e$ interactions at the far detector
• Measurement of Neutrino-Induced Charged-Current Charged Pion Production Cross Sections on Mineral Oil at E${}_{\nu }\sim 1\text{GeV}$
• Lepton Mass Effects in Single Pion Production by Neutrinos
• The NEUT Neutrino Interaction Simulation
• Differences in Quasi-Elastic Cross-Sections of Muon and Electron Neutrinos
• Improved constraints on neutrino mixing from the T2K experiment with $3.13\times 10^{21}$ protons on target
• Reanalysis of bubble chamber measurements of muon-neutrino induced single pion production
• Measurement of Coherent Production of ${\pi }^{\pm }$ in Neutrino and Anti-Neutrino Beams on Carbon from $E_{\nu }$ of $1.5$ to $20$ GeV
• Precision constraints for three-flavor neutrino oscillations from the full MINOS+ and MINOS data set
• Using world charged pion--nucleus scattering data to constrain an intranuclear cascade model
• A binned likelihood for stochastic models
• Electroweak Form Factors of the $\Delta$(1232) Resonance
• Lepton mass effects in weak CC single pion production
• Two-component model for the axial form factor of the nucleon
• Characterization of resistive Micromegas detectors for the upgrade of the T2K Near Detector Time Projection Chambers
• Summary of the NuSTEC Workshop on Neutrino-Nucleus Pion Production in the Resonance Region

Cited by in corpus (39)

• Atmospheric neutrino oscillation analysis with neutron tagging and an expanded fiducial volume in Super-Kamiokande I-V
• The symmetry approach to quark and lepton masses and mixing
• Improved limit on neutrinoless double beta decay of ${}^{100}$Mo from AMoRE-I
• Prediction of Energy Resolution in the JUNO Experiment
• Neutrino mass tension or suppressed growth rate of matter perturbations?
• Combined Pre-Supernova Alert System with Kamland and Super-Kamiokande
• Expanding neutrino oscillation parameter measurements in NOvA using a Bayesian approach
• Neutrino Mass Sum Rules from Modular ${\mathcal{A}}_4$ Symmetry
• A Mass Ordering Sum Rule for the Neutrino Disappearance Channels in T2K, NOvA and JUNO
• Parametrized uncertainties in the spectral function model of neutrino charged-current quasielastic interactions for oscillation analyses
• Search for Light Sterile Neutrinos With Two Neutrino Beams at MicroBooNE
• Nuclear deexcitation simulator for neutrino interactions and nucleon decays of ${}^{12}\text{C}$ and ${}^{16}\text{O}$ based on TALYS
• Implementation of a relativistic distorted wave impulse approximation model into the NEUT event generator
• Benchmarking neutrino interaction models via a comparative analysis of kinematic imbalance measurements from the T2K, MicroBooNE and MINERvA experiments
• Search for $CP$-Violating Neutrino Nonstandard Interactions with the NOvA Experiment
• Implementation and investigation of electron-nucleus scattering in the \textsc{NEUT} neutrino event generator
• CP-Violation with Neutrino Disappearance Alone
• Scale and redshift dependent limits on cosmic neutrino properties
• Energy-dependent flavour ratios in neutrino telescopes from charm
• Longitudinal kinematic imbalances in neutrino and antineutrino interactions for improved measurements of neutrino energy and the axial vector form factor
• Testing New Physics in Oscillations at a Neutrino Factory
• Data-driven model validation for neutrino-nucleus cross section measurements
• Alleviating the present tension between T2K and NO$\nu$A with nonstandard neutrino interactions
• Neutrino CP Measurement in the Presence of RG Running with Mismatched Momentum Transfers
• Constraining the isotropic CPT-odd coefficients of the Standard Model Extension by a combined DUNE and ESSnuSB analysis
• Implementation of the Martini-Ericson-Chanfray-Marteau RPA-based neutrino and antineutrino cross-section model in the GENIE neutrino event generator
• Testing the RG Running of the Leptonic Dirac CP Phase with Reactor Neutrinos
• Individual Neutrino Masses From a Supernova
• Lepton-flavor changing decays and non-unitarity in the inverse seesaw mechanism
• Searching for beyond-Standard-Model solar neutrino interactions using directional detectors
• Results from the T2K experiment on neutrino mixing including a new far detector $\mu$-like sample
• Minimal A4 Type-II Seesaw Realization of Testable Neutrino Mass Sum Rules
• Performance tests and hardware qualification of the FEBs for the Super-FGD of T2K Phase II
• Neutrino Oscillations in the Three Flavor Paradigm
• Predictions of the neutrino oscillations parameters
• The Sensitivity of DUNE in Presence of Off-Diagonal Scalar NSI Parameters
• Improving Neutrino-Nuclei Interaction Models: Recommendations and Case Studies on Peelle's Pertinent Puzzle
• The sensitivity of liquid scintillator detectors to CP-violation with atmospheric neutrinos
• First Measurement of the Electron Neutrino Charged-Current Pion Production Cross Section on Carbon with the T2K Near Detector