HAL : hal-00453647, version 1

arXiv : 1002.1071

DOI : 10.1103/PhysRevD.81.075001

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Physical Review D 81 (2010) 075001

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

G. Degrassi, P. Slavich 1

(01/04/2010)

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 Paris VI - Pierre et Marie Curie – Université Paris VII - Paris Diderot

Domaine

:

Physique/Physique des Hautes Energies - Phénoménologie

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Contributeur : Pietro Slavich <>

Soumis le : Vendredi 5 Février 2010, 12:53:34

Dernière modification le : Mercredi 21 Juillet 2010, 15:24:46