  Measurements performed at the Tevatron of both the like-sign dimuon charge
asymmetry 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 an
indication for new CP phases in Delta B = 2 transitions, preferentially in
B_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 the
B_s-meson system that are notably different from the SM expectation, suggesting
the presence of new physics in the Delta B = 1 sector as well. The very recent
LHCb measurements of B_s -> J/psi phi and B_s -> J/psi f_0, which do not find
any 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 potential
size of non-standard effects in Gamma_12^s stemming from dimension-six
operators with flavor content (sbar b) (taubar tau). We show that since the
existing constraints imposed by tree- and loop-level mediated B_d,s-meson
decays are quite loose, absorptive new physics of this type can in part explain
the current data. Our model-independent conclusions are finally contrasted with
explicit analyses of the new-physics effects in B_s-Bbar_s mixing that can
arise from leptoquarks or Z' bosons.
