Latest oscillation results from Daya Bay

TL;DR

The Daya Bay experiment's latest results precisely measure neutrino mixing parameters and search for sterile neutrinos using nearly a decade of reactor antineutrino data from multiple detectors.

Contribution

It provides the most recent and precise measurements of 3 and 2^2, and includes a comprehensive sterile neutrino search based on extensive data.

Findings

3 measured with 2.6% precision

Constraints placed on sterile neutrino parameters

Extended data set improves neutrino oscillation understanding

Abstract

The Daya Bay reactor neutrino experiment, which pioneered the measurement of a non-zero value for the neutrino mixing angle $\theta_{13}$ in 2012, operated for nearly nine years, from Nov.~24, 2011, to Dec.~12, 2020. Antineutrinos produced by six reactors, each with a thermal power of 2.9 GW, were detected by eight identically designed detectors located in two near and one far underground experimental halls. The experimental setup, featuring kilometer-scale baselines between the detectors and reactors, enabled precise investigations within the three-neutrino mixing framework. This proceeding presents the latest measurements of the neutrino mixing angle $\theta_{13}$ and the mass-squared difference $\Delta m_{32}^2$, based on samples tagged via gadolinium capture ($n$Gd) and hydrogen capture ($n$H). The combined results from Daya Bay's most recent $n$Gd and $n$H data sets provide a $2.6\%$ precision for $\sin^22\theta_{13}$. Additionally, a search for light sterile neutrinos with full data set is summarized.