Existing EP experiments constrain the charge-gravity coupling |κ| < 2.1×10^{-4} kg/C (95% CL), revealing an electromagnetic axis far less tested than composition-dependent violations.
(B1) These enter the effective Lagrangian as Leff ⊃P i(ci/Λ2)Oi, whereΛis the new physics energy scale and ci are dimensionless Wilson coefficients
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Toward Charge-Dependent Tests of the Equivalence Principle: A Phenomenological Parameter and an Unexplored Frontier
Existing EP experiments constrain the charge-gravity coupling |κ| < 2.1×10^{-4} kg/C (95% CL), revealing an electromagnetic axis far less tested than composition-dependent violations.