Limits on light-speed anisotropies from Compton scattering of high-energy electrons.
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 European Synchrotron Radiation Facility's GRAAL facility constrains such anisotropies representing the first nonthreshold collision-kinematics study of Lorentz violation. When interpreted within the minimal standard-model extension, this result yields the two-sided limit of 1.6×10(-14) at 95% confidence level on a combination of the parity-violating photon and electron coefficients (κ(o+))(YZ), (κ(o+))(ZX), c(TX), and c(TY). This new constraint provides an improvement over previous bounds by 1 order of magnitude.
Bocquet
J-P
JP
LPSC, UJF Grenoble 1, CNRS/IN2P3, INPG, 53 avenue des Martyrs 38026 Grenoble, France.
Moricciani
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Bellini
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Beretta
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Casano
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D'Angelo
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Di Salvo
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Fantini
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Franco
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Gervino
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Ghio
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Giardina
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Girolami
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Giusa
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Gurzadyan
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Kashin
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Knyazyan
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Lapik
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Lehnert
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Levi Sandri
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Lleres
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Mammoliti
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Mandaglio
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Manganaro
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Margarian
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Mehrabyan
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Messi
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Nedorezov
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Perrin
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Randieri
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Rebreyend
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Rudnev
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Turinge
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Vegna
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