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Title: A global fit of the γ-ray galactic center excess within the scalar singlet Higgs portal model

Abstract

We analyse the excess in the γ-ray emission from the center of our galaxy observed by Fermi-LAT in terms of dark matter annihilation within the scalar Higgs portal model. In particular, we include the astrophysical uncertainties from the dark matter distribution and allow for unspecified additional dark matter components. We demonstrate through a detailed numerical fit that the strength and shape of the γ-ray spectrum can indeed be described by the model in various regions of dark matter masses and couplings. Constraints from invisible Higgs decays, direct dark matter searches, indirect searches in dwarf galaxies and for γ-ray lines, and constraints from the dark matter relic density reduce the parameter space to dark matter masses near the Higgs resonance. We find two viable regions: one where the Higgs-dark matter coupling is of O(10{sup −2}), and an additional dark matter component beyond the scalar WIMP of our model is preferred, and one region where the Higgs-dark matter coupling may be significantly smaller, but where the scalar WIMP constitutes a significant fraction or even all of dark matter. Both viable regions are hard to probe in future direct detection and collider experiments.

Authors:
; ; ;  [1]
  1. Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen University,Sommerfeldstr. 16, 52056 Aachen (Germany)
Publication Date:
Sponsoring Org.:
SCOAP3, CERN, Geneva (Switzerland)
OSTI Identifier:
22572106
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2016; Journal Issue: 06; Other Information: PUBLISHER-ID: JCAP06(2016)050; OAI: oai:repo.scoap3.org:16188; cc-by Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANNIHILATION; ASTROPHYSICS; COSMIC GAMMA SOURCES; COSMIC PHOTONS; COSMOLOGY; COUPLING; GALAXIES; HIGGS BOSONS; HIGGS MODEL; NONLUMINOUS MATTER; PARTICLE DECAY; SPACE VEHICLES; WIMPS

Citation Formats

Cuoco, Alessandro, Eiteneuer, Benedikt, Heisig, Jan, and Krämer, Michael. A global fit of the γ-ray galactic center excess within the scalar singlet Higgs portal model. United States: N. p., 2016. Web. doi:10.1088/1475-7516/2016/06/050.
Cuoco, Alessandro, Eiteneuer, Benedikt, Heisig, Jan, & Krämer, Michael. A global fit of the γ-ray galactic center excess within the scalar singlet Higgs portal model. United States. doi:10.1088/1475-7516/2016/06/050.
Cuoco, Alessandro, Eiteneuer, Benedikt, Heisig, Jan, and Krämer, Michael. Tue . "A global fit of the γ-ray galactic center excess within the scalar singlet Higgs portal model". United States. doi:10.1088/1475-7516/2016/06/050.
@article{osti_22572106,
title = {A global fit of the γ-ray galactic center excess within the scalar singlet Higgs portal model},
author = {Cuoco, Alessandro and Eiteneuer, Benedikt and Heisig, Jan and Krämer, Michael},
abstractNote = {We analyse the excess in the γ-ray emission from the center of our galaxy observed by Fermi-LAT in terms of dark matter annihilation within the scalar Higgs portal model. In particular, we include the astrophysical uncertainties from the dark matter distribution and allow for unspecified additional dark matter components. We demonstrate through a detailed numerical fit that the strength and shape of the γ-ray spectrum can indeed be described by the model in various regions of dark matter masses and couplings. Constraints from invisible Higgs decays, direct dark matter searches, indirect searches in dwarf galaxies and for γ-ray lines, and constraints from the dark matter relic density reduce the parameter space to dark matter masses near the Higgs resonance. We find two viable regions: one where the Higgs-dark matter coupling is of O(10{sup −2}), and an additional dark matter component beyond the scalar WIMP of our model is preferred, and one region where the Higgs-dark matter coupling may be significantly smaller, but where the scalar WIMP constitutes a significant fraction or even all of dark matter. Both viable regions are hard to probe in future direct detection and collider experiments.},
doi = {10.1088/1475-7516/2016/06/050},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 06,
volume = 2016,
place = {United States},
year = {2016},
month = {6}
}