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The \CP-violating charge asymmetry in $B^{\pm}\rightarrow \phi K^{\pm}$decays is measured in a sample of $pp$ collisions at 7 TeV centre-of-massenergy, corresponding to an integrated luminosity of 1.0 fb$^{-1}$ collected bythe LHCb experiment. The result is $\mathcal{A}_{CP}(B^{\pm}\rightarrow \phiK^{\pm}) = \rm 0.022\pm 0.021 \pm 0.009$, where the first uncertainty isstatistical and the second systematic. In addition, a search for the$B^{\pm}\rightarrow \phi \pi^{\pm}$ decay mode is performed, using the$B^{\pm}\rightarrow \phi K^{\pm}$ decay rate for normalization. An upper limiton the branching fraction $\mathcal{B}(B^{\pm}\rightarrow \phi \pi^{\pm})<1.5\times 10^{-7}$ is set at 90% confidence level.

Measurement of the charge asymmetry in $B^{\pm}\rightarrow \phi K^{\pm}$ and search for $B^{\pm}\rightarrow \phi \pi^{\pm}$ decays