$t \to cWW$ and $WW \to \bar{t}c + t\bar{c}$ in Extended Models

Details $t \to cWW$ and $WW \to \bar{t}c + t\bar{c}$ in Extended Models $t \to cWW$ and $WW \to \bar{t}c + t\bar{c}$ in Extended Models

1997-07-03

arxiv.org/abs/hep-ph/9707229v1

Phys.Lett. B411 (1997) 306-312

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 7 figures

Scientific paper

10.1016/S0370-2693(97)00976-3

Jenkins has pointed out that the process $t\to cW^+W^-$ is GIM suppressed in the standard model. In this note, we calculate the branching ratio for a wide range of models, in which the decay occurs at tree level through exchange of a scalar, fermion or vector. In the case of scalar exchange, a scalar mass between $2m_W$ and 200 GeV leads to a resonant enhancement, giving a branching ratio as high as a few tenths of a percent. We then note that all of these models will also allow $W^+W^-\to \bar{t}c+t\bar{c}$, and we calculate the single-top/single-charm production rate at the LHC. The rates aren't negligibly small, but the background from single-top/single-bottom production will probably swamp the signal.

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