Effective neutrino number shift from keV-vacuum neutrinophilic 2HDM

Abstract

If the Dirac neutrino masses are generated by a new scalar doublet with a vacuum at keV order, there would be rare hope to probe the framework in low-energy flavor physics, such as the lepton-flavor violating processes. However, the predicted neutrino Yukawa couplings being around the order of electronic Yukawa can realize a purely thermal Dirac leptogenesis, and thus render a more direct link between the high- and the low-energy CP violation. Despite its inert property in the low-energy flavor processes, the keV-vacuum induced Dirac neutrino model can generate a significant shift of the effective neutrino number, which can in turn be probed by the big-bang nucleosynthesis and cosmic microwave background epochs. We show that such a keV-vacuum induced Dirac neutrino model is already constrained by the current observations and will be probed with forecast sensitivity, serving therefore as a complementary avenue to test the Dirac leptogenesis.

arXiv comment8 pages, and 3 figures

References in corpus (58)

• Verifiable Radiative Seesaw Mechanism of Neutrino Mass and Dark Matter
• Big Bang Nucleosynthesis: 2015
• Towards a complete theory of thermal leptogenesis in the SM and MSSM
• Electroweak baryogenesis
• Relic neutrino decoupling including flavour oscillations
• The Dawn of FIMP Dark Matter: A Review of Models and Constraints
• Lee-Quigg-Thacker Bounds for Higgs Boson Masses in a Two-Doublet Model
• Precision big bang nucleosynthesis with improved Helium-4 predictions
• The Sphaleron Rate in the Minimal Standard Model
• Big-Bang Nucleosynthesis After Planck
• Relic neutrino decoupling with flavour oscillations revisited
• SPT-3G: A Next-Generation Cosmic Microwave Background Polarization Experiment on the South Pole Telescope
• The design of the MEG II experiment
• Towards a precision calculation of $N_{\mathrm{eff}}$ in the Standard Model II: Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED
• Neutrino decoupling including flavour oscillations and primordial nucleosynthesis
• Feebly-Interacting Particles:FIPs 2020 Workshop Report
• A precision calculation of relic neutrino decoupling
• Tree-level unitarity constraints in the most general 2HDM
• Leptogenesis with Dirac Neutrinos
• Nonequilibrium Corrections to the Spectra of Massless Neutrinos in the Early Universe
• On Effective Degrees of Freedom in the Early Universe
• Precision Early Universe Thermodynamics made simple: $N_{\mathrm{eff}}$ and Neutrino Decoupling in the Standard Model and beyond
• Dynamics of Two Higgs Doublet CP Violation and Baryogenesis at the Electroweak Phase Transition
• A strong electroweak phase transition in the 2HDM after LHC8
• Neutrinos And Big Bang Nucleosynthesis
• Dirac neutrinos from a second Higgs doublet
• Realistic Dirac Leptogenesis
• Inert Dark Matter and Strong Electroweak Phase Transition
• Higgs doublet decay as the origin of the baryon asymmetry
• A New Two Higgs Doublet Model
• Search for charged Higgs bosons decaying into a top quark and a bottom quark at $\sqrt{s}$=13 TeV with the ATLAS detector
• Searching for Light Relics with Large-Scale Structure
• Thermalisation of sterile neutrinos in the early Universe in the 3+1 scheme with full mixing matrix
• Search for charged Higgs bosons decaying into a top and a bottom quark in the all-jet final state of pp collisions at $\sqrt{s}=$ 13 TeV
• The Simons Observatory: Astro2020 Decadal Project Whitepaper
• Search for a Charged Higgs Boson Produced in the Vector-boson Fusion Mode with Decay $H^{\pm }\to W^{\pm }Z$ using $pp$ Collisions at $\sqrt{s}=8$ TeV with the ATLAS Experiment
• The Simons Observatory: Instrument Overview
• Observing Dirac neutrinos in the cosmic microwave background
• Does $H\to \gamma \gamma$ Taste like vanilla New Physics?
• Dirac neutrinos and $N_{\mathrm{eff}}$
• Dirac neutrinos and $N_{\mathrm{eff}}$ II: the freeze-in case
• LHC phenomenology of a two-Higgs-doublet neutrino mass model
• Natural leptogenesis and neutrino masses with two Higgs doublets
• $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ and neutrino mass in the 2HDM-III with right-handed neutrinos
• Light Dirac neutrino portal dark matter with observable $\Delta N_{\mathrm{eff}}$
• Limits on Neutrinophilic Two-Higgs-Doublet Models from Flavor Physics
• Unraveling the Dirac Neutrino with Cosmological and Terrestrial Detectors
• On the Viability of Minimal Neutrinophilic Two-Higgs-Doublet Models
• Two sides of the same coin: sterile neutrinos and dark radiation. Status and perspectives
• Neutrino masses, mixing and leptogenesis in a two Higgs doublet model for the third generation
• Simple estimate of BBN sensitivity to light freeze-in dark matter
• Type I + II Seesaw in a Two Higgs Doublet Model
• Scotogenic Dirac neutrino mass models embedded with leptoquarks: one pathway to address the flavor anomalies and the neutrino masses together
• Freeze-in Dirac neutrinogenesis: thermal leptonic CP asymmetry
• Probing New Physics Signals with Symmetry-Restored Yukawa Textures
• Baryogenesis from Hierarchical Dirac Neutrinos
• Linking the $R_{K^{(\ast )}}$ anomalies to the Hubble tension via a single right-handed neutrino
• Next-to-tribimaximal mixing against CP violation and baryon asymmetry signs

Cited by in corpus (3)

• Collider and CMB complementarity of leptophilic dark matter with light Dirac neutrinos
• Dark matter freeze-in via a light fermion mediator: forbidden decay and scattering
• Forbidden neutrinogenesis