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Andreas Crivellin Albert Einstein Center for Fundamental Physics Institute for Theoretical Physics

Andreas Crivellin Albert Einstein Center for Fundamental Physics Institute for Theoretical Physics University of Bern. Flavour Phenomenology of Two-Higgs-Doublet Models. Outline:. Introductions: Yukawa interactions in 2HDMs Phenomenology Constraints from FCNC processes Tauonic B decays

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Andreas Crivellin Albert Einstein Center for Fundamental Physics Institute for Theoretical Physics

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  1. Andreas Crivellin Albert Einstein Center for Fundamental Physics Institute for Theoretical Physics University of Bern Flavour Phenomenology of Two-Higgs-Doublet Models

  2. Outline: • Introductions: Yukawa interactions in 2HDMs • Phenomenology • Constraints from FCNC processes • Tauonic B decays • LFV processes • Conclusions

  3. Introduction Yukawa interactions

  4. 2HDM of type II(MSSM at tree-level) • One Higgs doublet couples only to down-quarks (and charged leptons), the other Higgs doubletcouples only to up-quarks. • 2 additional free parameters:tan(β)=vu/vd and the heavy Higgs mass • All flavor-violations is due to the CKM matrix: neutral Higgs-quark couplings are flavor-conserving.

  5. 2HDM of type III • Both Higgs doublets couple simultaneously to up and down quarks. • The parameters describe flavor-changing neutral Higgs interactions • In the MSSM, are induced via loops

  6. Phenomenology

  7. Type-II 2HDM • Allowed 2σ regions from:(superimposed) Tension from

  8. Type-III: constraints from M→µ+µ- • B → µ+µ- constrains • Bs → µ+µ- constrains • KL → µ+µ- constrains • D → µ+µ- constrains and unconstrained from tree-level FCNCs

  9. Type-III: Constraints from b→s(d)γ • constrains • constrains • still unconstrained

  10. Tauonic B decays • Constructive contribution to B→τν using is possible. • B→D(*)τν and B→Dτν can be explained simultaneously using . Check model via Allowed regions from:

  11. Lepton Flavor violation • Correlations between and Predicted ratio in the 2HDM of type III

  12. Upper limits on lepton flavour violating B decays Allowed regions respecting the constraints from and

  13. Conclusions • The 2HDM of type II is disfavored by current data on tauonic B decays • In the 2HDM with generic Yukawa structure all off-diagonal elements except must be small. • A 2HDM of type III with flavour violation in the up-sector can explain B→τν, B→Dτν and B→D*τν simultaneously using . enhancement of A0→tc • Interesting correlations between among lepton flavor violating observables.

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