Neutrino masses, mixing and leptogenesis in a two Higgs doublet model for the third generation

Abstract

We examine neutrino oscillations in a two Higgs doublet model (2HDM) in which the second doublet couples only to the third generation right-handed up-fermions, i.e., to t_R and to N_3 which is the heaviest right-handed Majorana neutrino. The inherently large tan(beta) of this model can naturally account for the large top mass and, based on a quark-lepton similarity ansatz, when embedded into a seesaw mechanism it can also account for the observed neutrino masses and mixing angles giving a very small θ_{13}: -0.017 < θ_{13} < 0.021 at 99% CL, and a very restrictive prediction for the atmospheric mixing angle: 42.9^0 < θ_{atm} < 45.2^0 at 99% CL. The large value of tan(beta) also sets the mass scale of the heaviest right-handed Majorana neutrino N_3 and triggers successful leptogenesis through a CP-asymmetry in the decays of the N_1 (lightest right-handed Majorana) which is tan^2(beta) enhanced compared to the CP-asymmetry obtained in models for leptogenesis with one Higgs doublet or in the MSSM. This enhancement allows us to relax the lower bound on M_{N_1} and consequently also the lower bound on the reheating temperature of the early universe.

2 pages, 2 figures. Important changes made in v2: 1) improved presentation of leptogenesis and 2) a more elaborate discussion on the assumed texture zeros in the neutrino Yukawa sector. Important changes made in v3: minor changes added to emphasize that in our model the CP-asymmetry in the decays of the lightest Majorana is enhanced by tan^2(beta)~O(100) compared to models with one Higgs doublet as well as with respect to the MSSM

References in corpus (6)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Towards a complete theory of thermal leptogenesis in the SM and MSSM
• Cosmological Sign of Neutrino CP Violation
• Symmetry realization of texture zeros
• Predictions of the most minimal see-saw model
• Three heavy jet events at hadron colliders as a sensitive probe of the Higgs sector

Cited by in corpus (14)

• Leptogenesis
• Flavour physics of leptons and dipole moments
• Explaining $(g-2{)}_{\mu ,e}$, the KOTO anomaly and the MiniBooNE excess in an extended Higgs model with sterile neutrinos
• Leptogenesis in the Exceptional Supersymmetric Standard Model: flavour dependent lepton asymmetries
• Flavor Violating Higgs signals in the Texturized Two-Higgs Doublet Model (2HDM-Tx)
• A Two Higgs Doublet Model for Dark Matter and Neutrino Masses
• Neutrino Masses in a Two Higgs Doublet Model with a U(1) Gauge Symmetry
• Collider Bounds on 2-Higgs Doublet Models with $U(1{)}_X$ Gauge Symmetries
• Type I + II Seesaw in a Two Higgs Doublet Model
• Testing electroweak scale seesaw models at $e^{-}\gamma$ and $\gamma \gamma$ colliders
• Effective neutrino number shift from keV-vacuum neutrinophilic 2HDM
• Type-I thermal leptogenesis in $Z_3$-symmetric three Higgs doublet model
• Rare top decay t-> c l+l- as a probe of new physics
• The Hilbert Series and the Flavor Invariants of the 3HDM