Prospects of the Search for B_s0 Oscillations with ATLAS at LHC

Results of studies on the capabilities of the ATLAS detector to measure $B_{s}^{0}$ oscillations in $pp$ interactions at the Large Hadron Collider (LHC) are presented. For these studies, $B_{s}^{0}$ candidates in the $D_{s}^{-} \pi^{+}$ and $D_{s}^{-} a_{1}^{+}$ decay modes from semileptonic events were fully simulated and reconstructed, using a detailed detector description. The sensitivity and the expected accuracy for the measurement of the oscillation frequency were derived from unbinned maximum-likelihood amplitude fits as functions of the integrated luminosity. A detailed treatment of the systematic uncertainties was performed. The dependence of the measurement sensitivity on various parameters was also evaluated.