An Optimal Energy Estimator to Reduce Correlated Noise for the EXO-200 Light Readout

TL;DR

This paper introduces an optimal energy estimation method that reduces correlated noise in the EXO-200 detector, significantly enhancing its energy resolution for neutrinoless double beta decay detection.

Contribution

A new technique for extracting optimal scintillation energy measurements from multiple channels in the presence of correlated noise is proposed, improving detector resolution.

Findings

Energy resolution improved from 1.9641% to 1.5820%.

Method effectively reduces correlated noise impact.

Enhances sensitivity for neutrinoless double beta decay searches.

Abstract

The energy resolution of the EXO-200 detector is limited by electronics noise in the measurement of the scintillation response. Here we present a new technique to extract optimal scintillation energy measurements for signals split across multiple channels in the presence of correlated noise. The implementation of these techniques improves the energy resolution of the detector at the neutrinoless double beta decay Q-value from $\left[1.9641\pm 0.0039\right]\%$ to $\left[1.5820\pm 0.0044\right]\%$.