Updated bounds on the (1,2) neutrino oscillation parameters after first JUNO results

2025/11/26 by Francesco Capozzi, Capozzi, Francesco, E. Lisi +7 · 7 citations
Physics and Astronomy · #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2511.21650

Abstract

Within the standard 3ν framework, we discuss updated bounds on the leading oscillation parameters related to the (ν₁, ν₂) states, namely, the squared mass difference δm²=m²₂-m²₁ and the mixing parameter sin²θ₁₂. A previous global analysis of 2024 oscillation data estimated δm² and sin²θ₁₂ with fractional 1σ errors of about 2.3% and 4.5%, respectively. First we update the analysis by applying the latest SNO+ constraints, that slightly shift the (δm², sin²θ₁₂) best fits. Then we apply the constraints placed by the first JUNO results, that significantly reduce the uncertainties of both parameters. Our updated global bounds (as of 2025) can be summarized as: δm²/10^-5\rm eV² = 7.48± 0.10 and sin²θ₁₂=0.3085±0.0073 (with correlation ρ=-0.20), corresponding to 1σ uncertainties as small as 1.3% and 2.4%, respectively. We also comment on minor physical and statistical effects that, in the future, may contribute to lift the current mass-ordering degeneracy of (δm², θ₁₂) estimates.

Citations

• First measurement of reactor neutrino oscillations at JUNO
• Initial performance results of the JUNO detector
• Measurement of reactor antineutrino oscillations with 1.46 ktonne-years of data at SNO+
• Anomalies in neutrino oscillations and Physics BSM
• GLOBAL ANALYSIS OF NEUTRINO OSCILLATIONS

Cited by

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• Neutrino Constraints on Scalar-Tensor Gravity
• Neutrino texture-zeros after JUNO's first results: Implications for long-baseline neutrino experiments
• JUNO's Impact on the Neutrino Mass Ordering from Lorentz Invariance Violation
• Zooming in on `bi-large' neutrino mixing with the first JUNO results
• Trimaximal Mixing Patterns Meet the First JUNO Result
• Divergence in tracing the flavors of astrophysical neutrinos: can JUNO help IceCube?
• Scale-independent relations between neutrino mass parameters
• Lessons from the first JUNO results

Related

• Anomalies in neutrino oscillations and Physics BSM
• Lessons from the first JUNO results
• Enhancing the sensitivity to neutrino oscillation parameters using synergy between T2K, NOνA and JUNO
• Bounds on ν_μ Oscillations from Atmospheric Neutrinos
• First measurement of reactor neutrino oscillations at JUNO