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We consider new-physics (NP) contributions to the decay t -> b \bar{b} c. Weparameterize the NP couplings by an effective Lagrangian consisting of 10Lorentz structures. We show that the presence of NP can be detected through themeasurement of the partial width. A partial identification of the NP can beachieved through the measurements of a forward-backward-like asymmetry, atop-quark-spin-dependent asymmetry, the partial rate asymmetry, and atriple-product asymmetry. These observables, which vanish in the standardmodel, can all take values in the 10-20% range in the presence of NP. Since|V_{tb}V_{cb}| \simeq |V_{ts} V_{cs}|, most of our results also hold, withsmall changes, for t -> s \bar{s} c.

Using t -> b \bar{b} c to Search for New Physics