Search for Electron Antineutrino Appearance in a Long-baseline Muon Antineutrino Beam

Abstract

Electron antineutrino appearance is measured by the T2K experiment in an accelerator-produced antineutrino beam, using additional neutrino beam operation to constrain parameters of the PMNS mixing matrix. T2K observes 15 candidate electron antineutrino events with a background expectation of 9.3 events. Including information from the kinematic distribution of observed events, the hypothesis of no electron antineutrino appearance is disfavored with a significance of 2.40σ and no discrepancy between data and PMNS predictions is found. A complementary analysis that introduces an additional free parameter which allows non-PMNS values of electron neutrino and antineutrino appearance also finds no discrepancy between data and PMNS predictions.

arXiv admin note: text overlap with arXiv:1910.09439

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• Back to (Mass-)Square(d) One: The Neutrino Mass Ordering in Light of Recent Data
• Bounds on neutrino-scalar nonstandard interactions from big bang nucleosynthesis
• First T2K measurement of transverse kinematic imbalance in the muon-neutrino charged-current single-${\pi }^{+}$ production channel containing at least one proton
• First measurement of muon neutrino charged-current interactions on hydrocarbon without pions in the final state using multiple detectors with correlated energy spectra at T2K
• Addressing the Short-Baseline Neutrino Anomalies with Energy-Dependent Mixing Parameters
• Energy-Dependent Neutrino Mixing Parameters at Oscillation Experiments
• Combined sensitivity of JUNO and KM3NeT/ORCA to the neutrino mass ordering
• Quantum coherence and entanglement in neutral-current neutrino oscillation in matter
• Neutrino oscillation measurements with KamLAND and JUNO in the presence of scalar NSI
• Neutrino Oscillations in the Three Flavor Paradigm
• Performance evaluation of electron multiplier tubes as a high-intensity muon beam monitor of accelerator neutrino experiments