PoS - Proceedings of Science
Volume 421 - Neutrino Oscillation Workshop (NOW2022) - Session I. Oscillation parameters: present
Reactor neutrino oscillations in Daya Bay
Y.B. Hsiung*  on behalf of the Daya Bay collaboration
Full text: pdf
Pre-published on: February 07, 2023
Published on: March 28, 2023
We report the latest Daya Bay results of a determination of the smallest neutrino mixing angle $\theta_{13}$ and the mass-squared difference
$\Delta m^2_{32}$ at kilometer-scale baseline using the full data sample of $5.55 \times 10^6$ inverse bata-decay (IBD) candidates with neutron
captured on gadolinium in liquid scintillator detectors.
The final data sample was selected from the complete data set obtained by the Daya Bay reactor neutrino experiment in 3158 days of operation
between Dec.~24, 2011 and Dec.~12, 2020. We have optimized the IBD candidates selection, refined the energy calibration, and improved the
background treatment, and finally determined the oscillation parameters to be $\sin^2{2\theta_{13}}$ = $0.0851 \pm 0.0024$, and
$\Delta m^2_{32}$ = $(2.466 \pm 0.060) \times 10^{-3}$~eV$^2$ for the normal mass ordering or $\Delta m^2_{32}$ = $-(2.571\pm 0.060) \times 10^{-3}$~eV$^2$
for the inverted mass ordering.
The reported $\sin^2 2\theta_{13}$ with a precision of $2.8\%$ will likely remain the most precise measurement of $\theta_{13}$ in the foreseeable future
and will be crucial to the investigation of the mass hierarchy and $CP$ violation in the neutrino oscillation.
The agreement in $\sin^2 2\theta_{13}$ and $\Delta m^2_{32}$ between Daya Bay measurements using reactor $\overline{\nu}_e$ and the muon neutrino and antineutrino
measurements from accelerators and atmosphere experiments provides strong support of the three-neutrino paradigm.
DOI: https://doi.org/10.22323/1.421.0006
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