Search for Violation of CPT and Lorentz Invariance in $B^0_s$ Meson   Oscillations using the D0 Detector
  A search is presented for CPT-violating effects in the mixing of $B^0_s$ mesons using the D0 detector at the Fermilab Tevatron Collider. The CPT-violating asymmetry in the decay $B^0_s \rightarrow \mu^{\pm} D_s^{\mp} X$ as a function of sidereal phase is measured. No evidence for CPT-violating effects is observed and limits are placed on CPT- and Lorentz-invariance violating coupling coefficients. 
D0 Collaboration (R. Van Kooten for the collaboration)
hep-ex hep-ph