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

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

2011-07-04

arxiv.org/abs/1107.0754v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 7 figures; made a few small corrections, results unchanged

Scientific paper

We consider new-physics (NP) contributions to the decay t -> b \bar{b} c. We parameterize the NP couplings by an effective Lagrangian consisting of 10 Lorentz structures. We show that the presence of NP can be detected through the measurement of the partial width. A partial identification of the NP can be achieved through the measurements of a forward-backward-like asymmetry, a top-quark-spin-dependent asymmetry, the partial rate asymmetry, and a triple-product asymmetry. These observables, which vanish in the standard model, 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, with small changes, for t -> s \bar{s} c.

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