Flavor constraints on two-Higgs-doublet models with general diagonal Yukawa couplings

Journal Article · Mon Feb 01 00:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.035016· OSTI ID:21409211

Mahmoudi, F ^[1]; Staal, O ^[2]

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1. Clermont Universite, Universite Blaise Pascal, CNRS/IN2P3, LPC, BP 10448, 63000 Clermont-Ferrand (France)
2. High-Energy Physics, Department of Physics and Astronomy, Uppsala University, P.O. Box 516, 751 20 Uppsala (Sweden)

We consider constraints from flavor physics on two-Higgs-doublet models (2HDM) with general, flavor-diagonal, Yukawa couplings. Analyzing the charged Higgs contribution to different observables, we find that b{yields}s{gamma} transitions and {Delta}M{sub B{sub d}} restrict the coupling {lambda}{sub tt} of the top quark (corresponding to cot{beta} in models with a Z{sub 2} symmetry) to |{lambda}{sub tt}|<1 for m{sub H}{sup +} < or approx. 500 GeV. Stringent constraints from B meson decays are obtained also on the other third generation couplings {lambda}{sub bb} and {lambda}{sub {tau}{tau},} but with stronger dependence on m{sub H}{sup +}. For the second generation, we obtain constraints on combinations of {lambda}{sub ss}, {lambda}{sub cc}, and {lambda}{sub {mu}{mu}}from leptonic K and D{sub s} decays. The limits on the general couplings are translated to the common 2HDM types I-IV with a Z{sub 2} symmetry, and presented on the (m{sub H}{sup +},tan{beta}) plane. The flavor constraints are most excluding in the type II model which lacks a decoupling limit in tan{beta}. We obtain a lower limit m{sub H}{sup +} > or approx. 300 GeV in models of type II and III, while no lower bound on m{sub H}{sup +} is found for types I and IV.

• OSTI ID: 21409211
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 3; Other Information: DOI: 10.1103/PhysRevD.81.035016; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
B S MESONS
COUPLING
D S MESONS
DECOUPLING
FLAVOR MODEL
GEV RANGE 100-1000
HIGGS BOSONS
HIGGS MODEL
PARTICLE DECAY
SYMMETRY
T QUARKS
YUKAWA POTENTIAL
BEAUTY MESONS
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CHARM PARTICLES
CHARMED MESONS
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DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
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HADRONS
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MESONS
NUCLEAR POTENTIAL
PARTICLE MODELS
POSTULATED PARTICLES
POTENTIALS
PSEUDOSCALAR MESONS
QUARK MODEL
QUARKS
STRANGE MESONS
STRANGE PARTICLES
TOP PARTICLES