Test for Lorentz and CPT Violation with the MiniBooNE Low-Energy Excess

TL;DR

This paper investigates potential Lorentz and CPT violation using the MiniBooNE low-energy neutrino excess, analyzing data within the SME framework to identify possible new physics beyond standard neutrino oscillations.

Contribution

It applies the SME formalism to MiniBooNE data, exploring Lorentz and CPT violation as explanations for the low-energy excess, and discusses relationships with previous LSND results.

Findings

Time independent solution is favored

Systematic error analysis conducted

Relationship with LSND SME parameters discussed

Abstract

The MiniBooNE experiment is a $\nu_\mu\to\nu_e$ and $\bar\nu_\mu\to\bar\nu_e$ appearance neutrino oscillation experiment at Fermilab. The neutrino mode oscillation analysis shows an excess of $\nu_e$ candidate events in the low-energy region. These events are analyzed under the SME formalism, utilizing the short baseline approximation. The preliminary result shows the time independent solution is favored. The relationship with the SME parameters extracted from the LSND experiment is discussed. The systematic error analysis and antineutrino mode analysis are outlined.