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Measurements performed at the Tevatron of both the like-sign dimuon chargeasymmetry in B_d,s-meson samples and the mixing-induced CP asymmetry in B_s ->J/psi phi depart from their standard model (SM) predictions. This could be anindication for new CP phases in Delta B = 2 transitions, preferentially inB_s-Bbar_s mixing. The experimental situation, however, remained inconclusive,as it favored values of the element Gamma_12^s of the decay matrix in theB_s-meson system that are notably different from the SM expectation, suggestingthe presence of new physics in the Delta B = 1 sector as well. The very recentLHCb measurements of B_s -> J/psi phi and B_s -> J/psi f_0, which do not findany evidence for a new-physics phase in the element M_12^s of the mass matrix,point into this direction as well. In this article, we explore the potentialsize of non-standard effects in Gamma_12^s stemming from dimension-sixoperators with flavor content (sbar b) (taubar tau). We show that since theexisting constraints imposed by tree- and loop-level mediated B_d,s-mesondecays are quite loose, absorptive new physics of this type can in part explainthe current data. Our model-independent conclusions are finally contrasted withexplicit analyses of the new-physics effects in B_s-Bbar_s mixing that canarise from leptoquarks or Z' bosons.

New Physics in Gamma_12^s: (sbar b) (taubar tau) Operators