First search for Lorentz violation in double beta decay with scintillating calorimeters

TL;DR

This paper reports the first search for Lorentz violation in double beta decay using scintillating calorimeters, setting new limits on Lorentz violating coefficients with a Bayesian analysis that accounts for systematic uncertainties.

Contribution

It introduces the first limit on Lorentz violation in double beta decay using scintillating bolometers, demonstrating the technique's potential.

Findings

No evidence for Lorentz violation was found.

Set a limit on the isotropic Lorentz violating coefficient $ ext{ extmathring{a}}_{ ext{of}}^{(3)} < 4.1\times10^{-6}$ GeV.

First limit obtained with a scintillating bolometer.

Abstract

We present the search for Lorentz violation in the double beta decay of ^{82}Se~with CUPID-0, using an exposure of 9.95 kg x y. We found no evidence for the searched signal and set a limit on the isotropic components of the Lorentz violating coefficient of $\mathring{a}_{\text{of}}^{(3)} < 4.1\cdot10^{-6}$ GeV (90\% Credible Interval). This results is obtained with a Bayesian analysis of the experimental data and fully includes the systematic uncertainties of the model. This is the first limit on $\mathring{a}_{\text{of}}^{(3)}$ obtained with a scintillating bolometer, showing the potentiality of this technique.