Double Type-II Seesaw, Baryon Asymmetry and Dark Matter for Cosmic e^\pm Excesses

Abstract

We construct a new realization of type-II seesaw for neutrino masses and baryon asymmetry by extending the standard model with one light and two heavy singlet scalars besides one Higgs triplet. The heavy singlets pick up small vacuum expectation values to give a suppressed trilinear coupling between the triplet and doublet Higgs bosons after the light singlet drives the spontaneous breaking of lepton number. The Higgs triplet can thus remain light and be accessible at the LHC. The lepton number conserving decays of the heavy singlets can generate a lepton asymmetry stored in the Higgs triplet to account for the matter-antimatter asymmetry in the Universe. We further introduce stable gauge bosons from a hidden sector, which obtain masses and annihilate into the Higgs triplet after spontaneous breaking of the associated non-Abelian gauge symmetry. With Breit-Wigner enhancement, the stable gauge bosons can simultaneously explain the relic density of dark matter and the cosmic positron/electron excesses.

9 pages, 4 figures, minor rewording, final PRD version (in Press)

References in corpus (14)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Observation of an anomalous positron abundance in the cosmic radiation
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• Neutrino Masses and the LHC: Testing Type II Seesaw
• PAMELA Positron Excess as a Signal from the Hidden Sector
• Enhancement of Dark Matter Annihilation via Breit-Wigner Resonance
• Probing Majorana Phases and Neutrino Mass Spectrum in the Higgs Triplet Model at the LHC
• Dark Matter: The Leptonic Connection
• Testing neutrino masses in little Higgs models via discovery of doubly charged Higgs at LHC
• The Leptonic Higgs as a Messenger of Dark Matter
• Sneutrino Dark Matter and the Observed Anomalies in Cosmic Rays
• PAMELA/ATIC anomaly from the meta-stable extra dark matter component and the leptophilic Yukawa interaction
• ATIC and PAMELA Results on Cosmic e^\pm Excesses and Neutrino Masses

Cited by in corpus (10)

• LHC Phenomenology of Type II Seesaw: Nondegenerate Case
• Explaining PAMELA and WMAP data through Coannihilations in Extended SUGRA with Collider Implications
• Cascade Seesaw for Tiny Neutrino Mass
• Phenomenology in Minimal Cascade Seesaw for Neutrino Mass
• Dark Matter in the Singlet Extension of MSSM: Explanation of Pamela and Implication on Higgs Phenomenology
• Large Lepton Asymmetry for Small Baryon Asymmetry and Warm Dark Matter
• Decaying Dark Matter in the Supersymmetric Standard Model with Freeze-in and Seesaw mechanims
• Connections between the Seesaw and Dark Matter Searches
• TeV Scale Modified Type-II Seesaw and Dark Matter in a Gauged $U(1{)}_{\mathrm{B}-\mathrm{L}}$ Symmetric Model
• The Type II Dirac Seesaw Portal to the mirror sector: Connecting neutrino masses and a solution to the strong CP problem