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We consider the branching ratio and the CP asymmetries in B to f_0(980)K_Sdecay to the end of determining the deviation of the time-dependent CPasymmetry from sin(2 beta) arising from Standard Model physics. We obtain DeltaS_{f_0 K_S} within the context of the QCD factorization framework for the B tof_0(980)K_S decay amplitudes assuming the f_0(980) is a q\bar{q} state andemploying a random scan over the theoretical parameter space to assess thepossible range in Delta S_{f_0 K_S}. Imposing the value of the experimentalbranching ratio within 1 sigma and 3 sigma, respectively, of its central valueas a constraint, we find the range of Delta S_{f_0 K_S} to be [0.018, 0.033]for a scan in which the parameters are allowed to vary within 1 sigma of theircentral values and the range [-0.019, 0.064] for a scan in which the parametersvary within 3 sigma of their central values.

CP Asymmetries in B to f_0 K_S Decays