K20and the Equivalence Principle
Citations Over TimeTop 10% of 1961 papers
Abstract
It is shown that the existence of the long-lived neutral $K$ meson, and the absence of its decay into two pions, establishes that the gravitational masses of the ${K}^{0}$ and ${\overline{K}}^{0}$ are equal to a few parts in ${10}^{\ensuremath{-}10}$ of the $K$ inertial mass. This is of interest since the ${\overline{K}}^{0}$ is the antiparticle of the ${K}^{0}$, and is not identical with the ${K}^{0}$. The gravitational mass of such a nonidentical antiparticle has never been directly measured.Also, the ${\overline{K}}^{0}$ has opposite strangeness to the ${K}^{0}$. Thus the argument rules out any linear dependence of the gravitational mass on the strangeness quantum number, a point on which all previous experiments say nothing.These observations are in accord with, and serve as a confirmation of, the equivalence principle of Einstein.
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