Sub-percent precision measurement of neutrino oscillation parameters with JUNO*

JUNO is a multi-purpose neutrino observatory under construction in the south of China. This publica- tion presents new sensitivity estimates for the measurement of the ∆m231 , ∆m21 , sin2 θ12 , and sin2 θ13 oscillation parameters using reactor antineutrinos, which is one of the primary physics goals of the experiment. The sensitivit- ies 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 antineut- rino spectral shape constraints expected from the TAO satellite detector. It is found that the ∆m21 and sin2 θ12 oscil- lation parameters will be determined to 0.5% precision or better in six years of data collection. In the same period, the ∆m231 parameter will be determined to about 0.2% precision for each mass ordering hypothesis. The new preci- sion represents approximately an order of magnitude improvement over existing constraints for these three parameters.