Supersymmetric effects in top quark decay into polarized W-boson

Details Supersymmetric effects in top quark decay into polarized W-boson Supersymmetric effects in top quark decay into polarized W-boson

2003-06-27

arxiv.org/abs/hep-ph/0306278v2

Phys.Rev.D68:054019,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

Version in PRD (explanation and refs added)

Scientific paper

10.1103/PhysRevD.68.054019

We investigate the one-loop supersymmetric QCD (SUSY-QCD) and electroweak (SUSY-EW) corrections to the top quark decay into a b-quark and a longitudinal or transverse W-boson. The corrections are presented in terms of the longitudinal ratio \Gamma(t-->W_L b)/\Gamma(t--> W b) and the transverse ratio \Gamma(t-->W_- b)/\Gamma(t--> W b). In most of the parameter space, both SUSY-QCD and SUSY-EW corrections to these ratios are found to be less than 1% in magnitude and they tend to have opposite signs. The corrections to the total width \Gamma(t-->W b) are also presented for comparison with the existing results in the literature. We find that our SUSY-EW corrections to the total width differ significantly from previous studies: the previous studies give a large correction of more than 10% in magnitude for a large part of the parameter space while our results reach only few percent at most.

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