Possible indications of new physics in Bd-mixing and in sin(2β) determinations

Using the hadronic matrix elements from the lattice, B-K and xi(s), involving only the 4-quark operators for Delta flavor= 2 Hamiltonian relevant for K-(K) over bar, B-d-(B) over bar (d) and B-s-(B) over bar (s) mixing, along with V-cb, we deduce a nontrivial constraint on the SM, sin(2 beta) = 0.87 +/- 0.09. This deviates from direct experimental measurements via the tree process, b -> c(c) over bar s as well as the one via the penguin-loop b -> s decays by around 2.1 and 2.7 sigma respectively. If these deviations are confirmed-they would imply the presence of new physics rather pervasively in both B-d-(B) over bar (d) (i.e. very likely in b -> d) as well as in b -> s transitions requiring a beyond the SM CP-odd phase. Consequently, improvements in the relevant lattice calculations should be given a high priority. (C) 2008 Published by Elsevier B.V.