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The LHCb experiment is designed to perform flavour physics measurements atthe Large Hadron Collider. Using data collected during the 2010 run, wereconstruct a sample of $H_b\rightarrow h^+h'^-$ decays, where $H_b$ can beeither a $B^0$ meson, a $B_s^0$ meson or a $\Lambda_b$ baryon, while $h$ and$h^\prime$ stand for $\pi$, $K$ or $p$. We provide preliminary values of thedirect $\mathcal{CP}$ asymmetries of the neutral $B^0$ and $B_s^0$ mesons$A_{CP} (B^0\rightarrow K^+\pi^-) = -0.074 \pm 0.033\mathrm{(stat.)} \pm0.008\mathrm{(syst.)}$ and $A_{CP}(B_s^0\rightarrow\pi^+K^-)=0.15 \pm0.19\mathrm{(stat.)} \pm 0.02\mathrm{(syst.)}$.

Measurements of $A_{CP}(B^0\rightarrow K^+ \pi^-)$ and $A_{CP}(B_s\rightarrow \pi^+ K^-)$ at LHCb