Experimental Comparison of Neutrino, Antineutrino, and Muon Velocities

Abstract

No energy dependence of the velocities of neutrinos or antineutrinos is observed within the statistical and systematic errors over the energy range 30 to 200 GeV. The velocity differences (95% confidence level) are $|{\ensuremath{\beta}}_{\ensuremath{\nu}}\ensuremath{-}{\ensuremath{\beta}}_{\overline{\ensuremath{\nu}}}|<0.7\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, $|{\ensuremath{\beta}}_{{\ensuremath{\nu}}_{K}}\ensuremath{-}{\ensuremath{\beta}}_{{\ensuremath{\nu}}_{\ensuremath{\pi}}}|<0.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, and $|{\ensuremath{\beta}}_{\ensuremath{\nu}(\overline{\ensuremath{\nu}})}\ensuremath{-}{\ensuremath{\beta}}_{\ensuremath{\mu}}(\mathrm{corrected})|=|{\ensuremath{\beta}}_{\ensuremath{\nu}(\overline{\ensuremath{\nu}})}\ensuremath{-}1|<0.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, where $\ensuremath{\beta}=\frac{v}{c}$.