Cosmic ray anomalies and dark matter annihilation to muons via a Higgs portal hidden sector

Journal Article · Fri Jan 15 00:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.023530· OSTI ID:21409062

Kohri, Kazunori; McDonald, John; Sahu, Narendra ^[1]

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1. Cosmology and Astroparticle Physics Group, University of Lancaster, Lancaster LA1 4YB (United Kingdom)

Annihilating dark matter (DM) models based on a scalar hidden sector with Higgs portal-like couplings to the standard model are considered as a possible explanation for recently observed cosmic-ray excesses. Two versions of the model are studied, one with nonthermal DM as the origin of the boost factor and one with Sommerfeld enhancement. In the case of nonthermal DM, four hidden sector scalars which transform under a U(1){sub X} symmetry are added. The heaviest scalars decouple and later decay to DM scalars, thus providing the boost factor necessary to explain the present DM annihilation rate. The mass of the annihilating scalars is limited to < or approx. 600 GeV for the model to remain perturbative. U(1){sub X} breaking to Z{sub 2} at the electroweak transition mixes light O(100) MeV hidden sector scalars with the Higgs. The DM scalars annihilate to these light scalars, which subsequently decay to two {mu}{sup +{mu}-} pairs via Higgs mixing, thus generating a positron excess without antiprotons. Decay to {mu}{sup +{mu}-} rather than e{sup +}e{sup -} is necessary to ensure a fast enough light scalar decay rate to evade light scalar domination at nucleosynthesis. In the version with Sommerfeld enhancement only three new scalars are necessary. TeV scale DM masses can be accommodated, allowing both the higher energy electron plus positron excess and the lower energy positron excess to be explained. DM annihilates to 2{mu}{sup +{mu}-} pairs as in the nonthermal model. This annihilation mode may be favored by recent observations of the electron plus positron excess by FERMI and HESS.

• OSTI ID: 21409062
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 2; Other Information: DOI: 10.1103/PhysRevD.81.023530; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ANTIPROTONS
COSMIC RADIATION
COUPLING
ELECTRON-POSITRON INTERACTIONS
GEV RANGE 100-1000
HIGGS BOSONS
HIGGS MODEL
MASS
MIXING
MUONS MINUS
MUONS PLUS
NONLUMINOUS MATTER
NUCLEOSYNTHESIS
PARTICLE DECAY
SIMULATION
STANDARD MODEL
SYMMETRY
SYMMETRY BREAKING
TEV RANGE
U-1 GROUPS
WEINBERG-SALAM GAUGE MODEL
ANTIBARYONS
ANTILEPTONS
ANTIMATTER
ANTINUCLEI
ANTINUCLEONS
ANTIPARTICLES
BARYONS
BOSONS
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
GEV RANGE
GRAND UNIFIED THEORY
HADRONS
INTERACTIONS
IONIZING RADIATIONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
LIE GROUPS
MATHEMATICAL MODELS
MATTER
MUONS
NUCLEI
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE MODELS
POSTULATED PARTICLES
PROTONS
QUANTUM FIELD THEORY
RADIATIONS
SYMMETRY GROUPS
SYNTHESIS
U GROUPS
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES