A new parameter κ is defined to capture charge-dependent equivalence principle violations, with existing experiments constraining |κ| < 2.1 × 10^{-4} kg/C at 95% CL, eleven orders weaker than composition bounds.
A charge-dependent coupling would correspond to the independent, orthogonal combination ¯aeff,p −¯aeff,e, which has not been di- rectly probed
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Toward Charge-Dependent Tests of the Equivalence Principle: A Phenomenological Parameter and an Unexplored Frontier
A new parameter κ is defined to capture charge-dependent equivalence principle violations, with existing experiments constraining |κ| < 2.1 × 10^{-4} kg/C at 95% CL, eleven orders weaker than composition bounds.