Neutrino oscillation analysis of 217 live-days of Daya Bay and 500 live-days of RENO

TL;DR

This paper combines data from Daya Bay and RENO reactor neutrino experiments to improve the precision of neutrino oscillation parameters, achieving a 30-40% enhancement over individual analyses.

Contribution

It presents a combined spectral analysis of two major reactor neutrino experiments, enhancing the precision of key oscillation parameters.

Findings

Tighter constraints on $ heta_{13}$ and $ riangle m^2_{ee}$

Improved precision by 30-40% over individual analyses

Reasonable reproduction of previous results

Abstract

We present a neutrino oscillation analysis of two particular data sets from the Daya Bay and RENO reactor neutrino experiments aiming to study the increase in precision in the oscillation parameters $\sin^2{2\theta}_{13}$ and the effective mass splitting $\Delta m^2_{ee}$ gained by combining two relatively simple to reproduce analyses available in the literature. For Daya Bay the data from 217 days between December 2011 and July 2012 were used. For RENO we used the data from 500 live days between August 2011 and January 2012. We reproduce reasonably well the results of the individual analyses, both, rate-only and spectral, defining a suitable $\chi^2$ statistic for each case. Finally, we performed a combined spectral analysis and extract tighter constraints on the parameters, with an improved precision between 30-40\% with respect of the individual analyses considered.