New physics in B_s^0 -> J/\psi\phi decays?
  After a brief review of B_s^0 - \bar B_s^0 oscillations, we discuss the weak decays B_s^0 -> J/\psi\phi and B_s^0 -> J/\psi f_0(980) and the ratio R_{f_0/\phi} of their decay rates in the light of recent measurements by the LHCb, D0 and CDF Collaborations. We point out that the experimental values for R_{f_0/\phi} impose tight limits on new physics contributions to both decay channels. 
B. El-Bennich, J. P. B. C. de Melo, O. Leitner, B. Loiseau and J.-P.   Dedonder
hep-ph hep-ex nucl-th