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

Abstract

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.more » 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.« less

Authors:
; ;  [1]
  1. Cosmology and Astroparticle Physics Group, University of Lancaster, Lancaster LA1 4YB (United Kingdom)
Publication Date:
OSTI Identifier:
21409062
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 81; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevD.81.023530; (c) 2010 The American Physical Society; Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Kohri, Kazunori, McDonald, John, and Sahu, Narendra. Cosmic ray anomalies and dark matter annihilation to muons via a Higgs portal hidden sector. United States: N. p., 2010. Web. doi:10.1103/PHYSREVD.81.023530.
Kohri, Kazunori, McDonald, John, & Sahu, Narendra. Cosmic ray anomalies and dark matter annihilation to muons via a Higgs portal hidden sector. United States. doi:10.1103/PHYSREVD.81.023530.
Kohri, Kazunori, McDonald, John, and Sahu, Narendra. Fri . "Cosmic ray anomalies and dark matter annihilation to muons via a Higgs portal hidden sector". United States. doi:10.1103/PHYSREVD.81.023530.
@article{osti_21409062,
title = {Cosmic ray anomalies and dark matter annihilation to muons via a Higgs portal hidden sector},
author = {Kohri, Kazunori and McDonald, John and Sahu, Narendra},
abstractNote = {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.},
doi = {10.1103/PHYSREVD.81.023530},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 2,
volume = 81,
place = {United States},
year = {2010},
month = {1}
}