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The CP violating asymmetry asl is studied with a sample of Bs0 or Bs0barsemi-muonic decays in proton-proton collisions at a centre-of-mass energy of 7TeV at LHCb with an integrated luminosity of 1 fb^-1. The final state studiedis Ds{\mu}, with Ds reconstructed in the final state {\phi}{\pi}. The Ds{\mu}yields are summed over untagged Bs0 and Bs0bar initial states, and integratedwith respect to decay time. Data driven methods have been developed to measureall the efficiency ratios needed to determine asl from the measured rawasymmetry. We obtain asl= (-0.24+/-0.54+/-0.33)%, where the first uncertaintyis statistical and the second systematic.

Measurement of the flavour-specific CP violating asymmetry asl in B0s decay