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Tests of Lorentz violation in muon antineutrino to electron antineutrino oscillations

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arxiv hep-ex/0506067 v2 pith:6VDPB3F7 submitted 2005-06-27 hep-ex hep-ph

classification hep-exhep-ph
keywords neutrinolsndlorentzoscillationsexperimentsiderealviolationantineutrino
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

A recently developed Standard-Model Extension (SME) formalism for neutrino oscillations that includes Lorentz and CPT violation is used to analyze the sidereal time variation of the neutrino event excess measured by the Liquid Scintillator Neutrino Detector (LSND) experiment. The LSND experiment, performed at Los Alamos National Laboratory, observed an excess, consistent with neutrino oscillations, of ${\bar\nu}_e$ in a beam of ${\bar\nu}_\mu$. It is determined that the LSND oscillation signal is consistent with no sidereal variation. However, there are several combinations of SME coefficients that describe the LSND data; both with and without sidereal variations. The scale of Lorentz and CPT violation extracted from the LSND data is of order $10^{-19}$ GeV for the SME coefficients $a_L$ and $E \times c_L$. This solution for Lorentz and CPT violating neutrino oscillations may be tested by other short baseline neutrino oscillation experiments, such as the MiniBooNE experiment.

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