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Measurement of mixing-induced CP violation in Bs decays is of primeimportance in probing new physics. So far only the channel Bs->J/\psi \phi\ hasbeen used. Here we report on a measurement using an LHCb data sample of 0.41/fbin the CP odd eigenstate J\psi f0(980), where f0(980)->\pi+ \pi-. A timedependent fit of the data with the Bs lifetime and the difference in widths ofthe heavy and light eigenstates constrained to the values obtained from Bs->J/\psi\phi\ yields a value of the CP violating phase of -0.44 +/- 0.44 +/- 0.02rad, consistent with the Standard Model expectation.

Measurement of the CP violating phase \phi_s in Bs->J/\psi f0(980)