Dark Photon as Fractional Cosmic Neutrino Masquerader

Abstract

Recently, Weinberg proposed a Higgs portal model with a spontaneously broken global $U(1)$ symmetry in which Goldstone bosons may be masquerading as fractional cosmic neutrinos. We extend the model by gauging the $U(1)$ symmetry. This gives rise to the so-called dark photon and dark Higgs. The dark photons can constitute about 0.912 (0.167) to the effective number of light neutrino species if they decouple from the thermal bath before the pions become non-relativistic and after (before) the QCD transition. Restriction on the parameter space of the portal coupling and the dark Higgs mass is obtained from the freeze-out condition of the dark photons. Combining with the collider data constraints on the invisible width of the standard model Higgs requires the dark Higgs mass to be less than a few GeV.

arXiv comment19 pages, 3 figures

References in corpus (63)

• Planck 2013 results. XVI. Cosmological parameters
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• The order of the quantum chromodynamics transition predicted by the standard model of particle physics
• BICEP2 I: Detection Of B-mode Polarization at Degree Angular Scales
• Secluded WIMP Dark Matter
• The chiral and deconfinement aspects of the QCD transition
• Full result for the QCD equation of state with 2+1 flavors
• The Low-Energy Frontier of Particle Physics
• DarkSUSY: Computing Supersymmetric Dark Matter Properties Numerically
• Echoes of a Hidden Valley at Hadron Colliders
• The QCD transition temperature: results with physical masses in the continuum limit
• Is there still any Tc mystery in lattice QCD? Results with physical masses in the continuum limit III
• Neutralino Relic Density including Coannihilations
• Relic neutrino decoupling including flavour oscillations
• New Fixed-Target Experiments to Search for Dark Gauge Forces
• The QCD transition temperature: results with physical masses in the continuum limit II.
• Astrophysical Axion Bounds
• A Minimal Spontaneously Broken Hidden Sector and its Impact on Higgs Boson Physics at the Large Hadron Collider
• Naturally Light Hidden Photons in LARGE Volume String Compactifications
• Probing the Standard Model with Higgs signal rates from the Tevatron, the LHC and a future ILC
• Higgs-field Portal into Hidden Sectors
• New Limits on Hidden Photons from Past Electron Beam Dumps
• Toward an Understanding of Foreground Emission in the BICEP2 Region
• Thermal Relics in Hidden Sectors
• Global fit to Higgs signal strengths and couplings and implications for extended Higgs sectors
• The universal Higgs fit
• Novel Effects in Electroweak Breaking from a Hidden Sector
• Goldstone Bosons as Fractional Cosmic Neutrinos
• How secret interactions can reconcile sterile neutrinos with cosmology
• Helioscope Bounds on Hidden Sector Photons
• Updated Global Analysis of Higgs Couplings
• Light shining through walls
• Phase transitions in the early and the present Universe
• First results of the CERN Resonant WISP Search (CROWS)
• Neutrinos And Big Bang Nucleosynthesis
• Higgs Precision (Higgcision) Era begins
• Neutrinos help reconcile Planck measurements with both Early and Local Universe
• The likelihood of GODs' existence: Improving the SN1987a constraint on the size of large compact dimensions
• Relic Neutrinos, thermal axions and cosmology in early 2014
• WIMP Dark Matter and the QCD Equation of State
• Lepton flavor violation in the Higgs sector and the role of hadronic tau-lepton decays
• Narrow Trans-TeV Higgs Bosons and $H\to hh$ Decays: Two LHC Search Paths for a Hidden Sector Higgs Boson
• Probing Hidden Sector Photons through the Higgs Window
• Sterile Neutrinos: Cosmology vs Short-BaseLine Experiments
• Fingerprints of Galactic Loop I on the Cosmic Microwave Background
• A Very Narrow Shadow Extra Z-boson at Colliders
• Continuous Global Symmetries and Hyperweak Interactions in String Compactifications
• No new cosmological concordance with massive sterile neutrinos
• Equivalent Neutrinos, Light WIMPs, and the Chimera of Dark Radiation
• The Minimal Phantom Sector of the Standard Model: Higgs Phenomenology and Dirac Leptogenesis
• Finite temperature effects on the neutrino decoupling in the early Universe
• Dark radiation from particle decay: cosmological constraints and opportunities
• Light sterile neutrinos after BICEP-2
• Cosmological constraints on neutrinos after BICEP2
• The Higgs portal and an unified model for dark energy and dark matter
• Quark-Hadron Phase Transitions in Viscous Early Universe
• Dark photons and resonant monophoton signatures in Higgs boson decays at the LHC
• Self-interacting Dark Radiation
• Multilepton Higgs Decays through the Dark Portal
• Probing interactions within the dark matter sector via extra radiation contributions
• Weinberg's Higgs portal confronting recent LUX and LHC results together with upper limits on B^+ and K^+ decay into invisibles
• Collider Signatures of Goldstone Bosons
• Supernova Bounds on Weinberg's Goldstone Bosons

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