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We present the first search for CPT-violating effects in the mixing of${B_s^0}$ mesons using the full Run II data set with an integrated luminosityof 10.4 fb$^{-1}$ of proton-antiproton collisions collected using the D0detector at the Fermilab Tevatron Collider. We measure the CPT-violatingasymmetry in the decay $B_s^0 \to \mu^\pm D_s^\pm$ as a function of celestialdirection and sidereal phase. We find no evidence for CPT-violating effects andplace limits on the direction and magnitude of flavor-dependent CPT- andLorentz-invariance violating coupling coefficients. We find 95\% confidenceintervals of $\Delta a_{\perp} < 1.2 \times 10^{-12}$ GeV and $(-0.8 < \Deltaa_T - 0.396 \Delta a_Z < 3.9) \times 10^{-13}$ GeV.

Search for Violation of $CPT$ and Lorentz invariance in ${B_s^0}$ meson oscillations