Probing anomalous tWb interactions with rare B decays

Understand

Precision studies of top quark properties are currently underway at the LHC and Tevatron colliders with the prospect of probing anomalous t-W -b interactions.

• In the mean time, recent experimental results for the B_{d,s} - \bar{B}_{d,s} oscillation observables, the branching ratio B_s->\mu^+\mu^-, as well as the forward - backward asymmetry in B->K\starl^+l^-, accompanied by the accurate theoretical predictions for the relevant observables obtained within the SM motivate a combined study of these observables in the presence of anomalous t - W - b vertices.
• We investigate contributions of such anomalous couplings to the B->X_s l^+l^- decay mode, and combining them with the modifications of the B_{d,s} - \bar{B}_d,s, B->X_s{\gamma} observables, we determine indirect bounds on the real and imaginary parts of the anomalous t - W - b interactions.
• We find these to be mostly superior to present direct constraints coming from top decay and production measurements at the LHC and Tevatron.