$\gamma + \phi_s$ sensitivity studies from combined $B_{s}^{0}\to D_{s}^{-}\pi^{+}$ and $B_{s}^{0}\to D_{s}^{\mp}K^{\pm}$ samples at LHCb

At the LHCb experiment the decay channels $\Bpiminus$ and $\BKminusplus$ will be used to determine the physics parameters $\dMs$ and $\gamma + \phi_s$. By performing toy Monte Carlo simulation studies, using information from a full GEANT LHCb simulation, we expect statistical uncertainties of $\sigma(\dMs)=0.007\ps^{-1}$ and \mbox{$\sigma(\gamma + \phi_s)=10.3^{\circ}$} for an integrated luminosity of $2\fb^{-1}$.