scholarly journals Neutrino masses in a two Higgs doublet model with a U(1) gauge symmetry

2019 ◽  
Vol 2019 (4) ◽  
Author(s):  
Daniel A. Camargo ◽  
Alex G. Dias ◽  
Téssio B. de Melo ◽  
Farinaldo S. Queiroz
Keyword(s):  
Gauge Symmetry ◽  
Higgs Doublet ◽  
Neutrino Masses ◽  
Doublet Model ◽  
Two Higgs Doublet Model

scholarly journals PATHWAYS TO TESTABLE LEPTOGENESIS

2010 ◽  
Vol 25 (07) ◽  
pp. 501-509 ◽  
Author(s):  
PEI-HONG GU ◽  
UTPAL SARKAR
Keyword(s):  
Higgs Doublet ◽  
Neutrino Masses ◽  
High Scale ◽  
Cp Asymmetry ◽  
Decay Products ◽  
Doublet Model ◽  
Mass Degeneracy ◽  
Three Body ◽  
Two Higgs Doublet Model ◽  
Very High

In the conventional seesaw models of neutrino masses, leptogenesis occurs at a very high scale. Three approaches have been discussed in the literature to lower the scale of leptogenesis making them testable: mass degeneracy, hierarchy of couplings and three-body decays. We advocate yet another approach to a testable leptogenesis, whereby the decaying particles could go out of equilibrium at an accessible scale due to kinematics, although their couplings to the decay products are larger for generating a desired CP asymmetry. We demonstrate this new possibility for the testable leptogenesis in a two-Higgs doublet model where the neutrino masses originate from a one-loop diagram.

scholarly journals A variant two-Higgs doublet model with a new Abelian gauge symmetry

2019 ◽  
Vol 795 ◽  
pp. 22-28
Author(s):  
Chuan-Ren Chen ◽  
Cheng-Wei Chiang ◽  
Kuo-Yen Lin
Keyword(s):  
Gauge Symmetry ◽  
Higgs Doublet ◽  
Abelian Gauge ◽  
Doublet Model ◽  
Two Higgs Doublet Model

scholarly journals A two Higgs doublet model for dark matter and neutrino masses

2019 ◽  
Vol 795 ◽  
pp. 319-326 ◽  
Author(s):  
Daniel A. Camargo ◽  
Miguel D. Campos ◽  
Téssio B. de Melo ◽  
Farinaldo S. Queiroz
Keyword(s):  
Dark Matter ◽  
Higgs Doublet ◽  
Neutrino Masses ◽  
Doublet Model ◽  
Two Higgs Doublet Model

scholarly journals Interplay of New Physics effects in (g − 2)ℓ and h → ℓ+ℓ− — lessons from SMEFT

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Svjetlana Fajfer ◽  
Jernej F. Kamenik ◽  
M. Tammaro
Keyword(s):  
Closed Operator ◽  
Higgs Doublet ◽  
New Physics ◽  
Effective Field ◽  
Tree Level ◽  
Electroweak Symmetry ◽  
Scalar Leptoquark ◽  
Doublet Model ◽  
The One ◽  
Two Higgs Doublet Model

Abstract We explore the interplay of New Physics (NP) effects in (g− 2)ℓ and h→ℓ+ℓ− within the Standard Model Effective Field Theory (SMEFT) framework, including one-loop Renormalization Group (RG) evolution of the Wilson coefficients as well as matching to the observables below the electroweak symmetry breaking scale. We include both the leading dimension six chirality flipping operators including a Higgs and SU(2)L gauge bosons as well as four-fermion scalar and tensor operators, forming a closed operator set under the SMEFT RG equations. We compare present and future experimental sensitivity to different representative benchmark scenarios. We also consider two simple UV completions, a Two Higgs Doublet Model and a single scalar LeptoQuark extension of the SM, and show how tree level matching to SMEFT followed by the one-loop RG evolution down to the electroweak scale can reproduce with high accuracy the (g−2)ℓ and h→ℓ+ℓ− contributions obtained by the complete one- and even two-loop calculations in the full models.

Sign in / Sign up

Export Citation Format

Share Document