Limits on light-speed anisotropies from Compton scattering of high-energy electrons

J.-P. Bocquet , D. Moricciani , V. Bellini , M. Beretta , L. Casano , A. D'Angelo , R. Di Salvo , A. Fantini

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D. Franco G. Gervino F. Ghio G. Giardina B. Girolami A. Giusa V.G. Gurzadyan A. Kashin S. Knyazyan A. Lapik R. Lehnert P. Levi Sandri A. Lleres F. Mammoliti G. Mandaglio M. Manganaro A. Margarian S. Mehrabyan R. Messi V. Nedorezov C. Perrin C. Randieri D. Rebreyend N. Rudnev G. Russo C. Schaerf M.L. Sperduto M.C. Sutera A. Turinge V. Vegna

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classification ✦ hep-ex hep-phphysics.atom-ph

keywords anisotropieselectronsspeedabsenceboundscoefficientscollision-kinematicscombination

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The possibility of anisotropies in the speed of light relative to the limiting speed of electrons is considered. The absence of sidereal variations in the energy of Compton-edge photons at the ESRF's GRAAL facility constrains such anisotropies representing the first non-threshold collision-kinematics study of Lorentz violation. When interpreted within the minimal Standard-Model Extension, this result yields the two-sided limit of 1.6 x 10^{-14} at 95% confidence level on a combination of the parity-violating photon and electron coefficients kappa_{o+} and c. This new constraint provides an improvement over previous bounds by one order of magnitude.

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Crystallography, Lorentz violation, and the Standard-Model Extension
cond-mat.mes-hall 2026-04 unverdicted novelty 6.0

Crystal point groups parametrize SME Lorentz-violating coefficients in electromagnetic media, turning birefringent and multiferroic crystals into analogs for high-energy symmetry violations.