Sub-percent Precision Measurement of Neutrino Oscillation Parameters with JUNO

TL;DR

This paper estimates JUNO's ability to measure neutrino oscillation parameters with sub-percent precision, significantly improving current constraints through detailed sensitivity analysis of the detector and reactor data.

Contribution

It provides new sensitivity estimates for key neutrino oscillation parameters using JUNO, incorporating comprehensive site, detector, and spectral shape uncertainties.

Findings

Parameters will be measured to better than 0.5% precision in six years.

Achieves approximately tenfold improvement over existing constraints.

Demonstrates JUNO's potential for high-precision neutrino physics.

Abstract

JUNO is a multi-purpose neutrino observatory under construction in the south of China. This publication presents new sensitivity estimates for the measurement of the $\Delta m^2_{31}$, $\Delta m^2_{21}$, $\sin^2 \theta_{12}$, and $\sin^2 \theta_{13}$ oscillation parameters using reactor antineutrinos, which is one of the primary physics goals of the experiment. The sensitivities are obtained using the best knowledge available to date on the location and overburden of the experimental site, the nuclear reactors in the surrounding area and beyond, the detector response uncertainties, and the reactor antineutrino spectral shape constraints expected from the TAO satellite detector. It is found that the $\Delta m^2_{31}$, $\Delta m^2_{21}$, and $\sin^2 \theta_{12}$ oscillation parameters will be determined to better than 0.5% precision in six years of data collection, which represents approximately an order of magnitude improvement over existing constraints.