The Top-Quark Width in the Light of $Z$-Boson Physics

Details The Top-Quark Width in the Light of $Z$-Boson Physics The Top-Quark Width in the Light of $Z$-Boson Physics

1995-08-21

arxiv.org/abs/hep-ph/9508339v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

One new figure added, with supplementary comments. 17 pages, LaTeX, 2 figures included via psbox. A postcript version can be o

Scientific paper

We discuss possible non-standard contributions to the top-quark width, particularly the virtual effects on the standard decay $t\rightarrow W^+\,b$ within the context of the MSSM. We also place a renewed emphasis on the unconventional mode $t\rightarrow H^+\,b$ in the light of recent analyses of $Z$-boson observables. It turns out that in the region of parameter space highlighted by $Z$-boson physics, the charged Higgs mode should exhibite an appreciable branching fraction as compared to the standard decay of the top quark. Remarkably enough, the corresponding quantum effects in this region are also rather large, slowly decoupling, and most likely resolvable in the next generation of experiments at Tevatron and at LHC.

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