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Recently, the CDF and D0 collaborations measured indirect CP violation in Bs-> J/psi phi and found a hint of a signal. If taken at face value, this can beinterpreted as a nonzero phase of Bs-Bsbar mixing (beta_s), in disagreementwith the standard model, which predicts that beta_s ~= 0. In this paper, weargue that this analysis may be incomplete. In particular, there can be newphysics (NP) in the bbar -> sbar c cbar decay. If so, the value of beta_s isdifferent than for the case in which NP is assumed to be present only in themixing. We have examined several models of NP and found that, indeed, there canbe significant contributions to the decay. These effects are consistent withmeasurements in B -> J/psi K* and Bd -> J/psi Ks. Due to the NP in the decay,polarization-dependent indirect CP asymmetries and triple-product asymmetriesare predicted in Bs -> J/psi phi.

New Physics in Bs -> J/psi phi: a General Analysis