Tests of Lorentz and CPT violation with MiniBooNE neutrino oscillation excesses

TL;DR

This paper investigates MiniBooNE neutrino oscillation excesses for signs of Lorentz and CPT violation, analyzing sidereal time dependence to explore potential new physics beyond the Standard Model.

Contribution

It presents the first search for Lorentz violation signals in MiniBooNE neutrino data using sidereal time analysis within the SME framework.

Findings

No significant sidereal time dependence detected

Constraints placed on Lorentz violation parameters in neutrinos

Supports the need for further tests of fundamental symmetries

Abstract

Violation of Lorentz invariance and CPT symmetry is a predicted phenomenon of Planck-scale physics. Various types of data are analyzed to search for Lorentz violation under the Standard-Model Extension (SME) framework, including neutrino oscillation data. MiniBooNE is a short-baseline neutrino oscillation experiment at Fermilab. The measured excesses from MiniBooNE cannot be reconciled within the neutrino Standard Model; thus it might be a signal of new physics, such as Lorentz violation. We have analyzed the sidereal time dependence of MiniBooNE data for signals of the possible breakdown of Lorentz invariance in neutrinos. In this brief review, we introduce Lorentz violation, the neutrino sector of the SME, and the analysis of short-baseline neutrino oscillation experiments. We then present the results of the search for Lorentz violation in MiniBooNE data. This review is based on the published result (ArXiv:1109.3480).