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Lorentz and CPT symmetry in the quark sector of the Standard Model arestudied in the context of an effective field theory using ZEUS $e^{\pm} p$data. Symmetry-violating effects can lead to time-dependent oscillations ofotherwise time-independent observables, including scattering cross sections. Ananalysis using five years of inclusive neutral-current deep inelasticscattering events corresponding to an integrated HERA luminosity of $372\;\text{pb}^{-1}$ at $\sqrt{s} = 318$ Gev has been performed. No evidence foroscillations in sidereal time has been observed within statistical andsystematic uncertainties. Constraints, most for the first time, are placed on42 coefficients parameterising dominant CPT-even dimension-four and CPT-odddimension-five spin-independent modifications to the propagation andinteraction of light quarks.

Search for effective Lorentz and CPT violation using ZEUS data