A limit on the anisotropy of the one-way maximum attainable speed of the electron

Abstract

We report here the first experimental result for the anisotropy of the one-way maximum attainable speed of the electron, $\overrightarrow{\Delta c_{1,e}}$, obtained via the study of a sidereal time dependence of a difference between the electron and positron beam momenta in the CESR storage ring at Cornell University. At 95 percent confidence, an upper limit for the component of $\Delta {\vec{c}}_{1,e}/c$ perpendicular to Earth's rotational axis is found to be $5.5\times 10^{-15}$.

6 pages, 5 figures

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