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arXiv: 1002.1071

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QCD Corrections in two-Higgs-doublet extensions of the Standard Model with Minimal Flavor Violation

G. Degrassi, P. Slavich 1

(2010-02-04)

We present the QCD corrections to R_b and to the Delta B=1 effective Hamiltonian in models with a second Higgs field that couples to the quarks respecting the criterion of Minimal Flavor Violation, thus belonging either to the (1,2)_1/2 or to the (8,2)_1/2 representation of SU(3)xSU(2)xU(1). After the inclusion of the QCD corrections, the prediction for R_b becomes practically insensitive to the choice of renormalization scheme for the top mass, which for the type-I and type-II models translates in a more robust lower bound on tan(beta). The QCD-corrected determinations of Rb and BR(B->Xs gamma) are used to discuss the constraints on the couplings of a (colored) charged Higgs boson to top and bottom quarks.

1:	Laboratoire de Physique Théorique et Hautes Energies (LPTHE)
	CNRS : UMR7589 – Université Pierre et Marie Curie - Paris VI – Université Paris-Diderot - Paris VII

Subject

:

Physics/High Energy Physics - Phenomenology

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From: Pietro Slavich <>

Submitted on: Friday, 5 February 2010 12:53:34

Updated on: Friday, 5 February 2010 12:53:34