The Two Higgs Doublet Model of Type II facing flavour physics data

We discuss tests of the charged Higgs sector of the Two Higgs Doublet Model (2HDM) of Type II in the light of recent flavour physics data. Particular attention is paid to recent measurement of purely leptonic decays of heavy-light mesons, which depart more or less significantly from the Standard Model (SM) predictions. We derive constraints on the parameters of the 2HDM type II from leptonic and semileptonic ∆F = 1 decays as well as loop processes (b → sγ or Z → b̄b) sensitive to charged Higgs contributions. The outcome of this work is that while 2HDM Type II can fit individual observable through fine-tuning schemes, in a combined analysis it does not perform better than the SM by favouring a decoupling solution. Assuming that 2HDM Type II is realized in Nature, constraints on its parameters (mH+ and tanβ) are derived. A limit on the charged Higgs mass mH+ > 304 GeV at 95% CL is obtained irrespective of the value of tan β. This limit is dominated by the b → sγ branching ratio measurement. All results have been obtained with the CKMfitter analysis package, featuring the frequentist statistical approach Rfit to handle theoretical uncertainties. aLaboratoire d’Annecy-Le-Vieux de Physique des Particules 9 Chemin de Bellevue, BP 110, F-74941 Annecy-le-Vieux Cedex, France (UMR 5814 du CNRS-IN2P3 associée à l’Université de Savoie) e-mail: [email protected], [email protected] cLaboratoire de Physique Corpusculaire de Clermont-Ferrand Université Blaise Pascal 24 Avenue des Landais F-63177 Aubiere Cedex (UMR 6533 du CNRS-IN2P3 associée à l’Université Blaise Pascal) e-mail: [email protected], [email protected], [email protected] fLaboratoire de Physique Théorique Bâtiment 210, Université Paris-Sud 11, F-91405 Orsay Cedex, France CNRS/Univ. Paris-Sud 11 (UMR 8627) e-mail: [email protected] http://ckmfitter.in2p3.fr