3.55 keV line from exciting dark matter without a hidden sector

Berlin, Asher; DiFranzo, Anthony; Hooper, Dan

doi:10.1103/PhysRevD.91.075018

Title: 3.55 keV line from exciting dark matter without a hidden sector

Journal Article · Fri Apr 24 00:00:00 EDT 2015 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.91.075018· OSTI ID:1247494

Berlin, Asher ^[1]; DiFranzo, Anthony ^[2]; Hooper, Dan ^[3]

Univ. of Chicago, Chicago, IL (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of California, Irvine, CA (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)

In this study, models in which dark matter particles can scatter into a slightly heavier state which promptly decays to the lighter state and a photon (known as eXciting Dark Matter, or XDM) have been shown to be capable of generating the 3.55 keV line observed from galaxy clusters, while suppressing the flux of such a line from smaller halos, including dwarf galaxies. In most of the XDM models discussed in the literature, this up-scattering is mediated by a new light particle, and dark matter annihilations proceed into pairs of this same light state. In these models, the dark matter and the mediator effectively reside within a hidden sector, without sizable couplings to the Standard Model. In this paper, we explore a model of XDM that does not include a hidden sector. Instead, the dark matter both up-scatters and annihilates through the near resonant exchange of an O(10²) GeV pseudoscalar with large Yukawa couplings to the dark matter and smaller, but non-neglibile, couplings to Standard Model fermions. The dark matter and the mediator are each mixtures of Standard Model singlets and SU(2)_W doublets. We identify parameter space in which this model can simultaneously generate the 3.55 keV line and the gamma-ray excess observed from the Galactic center, without conflicting with constraints from colliders, direct detection experiments, or observations of dwarf galaxies.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359; FG02-13ER41958; SC0009924

OSTI ID:: 1247494

Alternate ID(s):: OSTI ID: 1180538

Report Number(s):: FERMILAB-PUB-15-009-A; arXiv:1501.03496; PRVDAQ; 1339382

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 91, Issue 7; ISSN 1550-7998

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Observation of the new emission line at ~3.5 keV in X-ray spectra of galaxies and galaxy clusters Iakubovskyi, D. Advances in Astronomy and Space Physics, Vol. 6, Issue 1 https://doi.org/10.17721/2227-1481.6.3-15	journal	January 2016
Constraints on Axion-like Particles from X-Ray Observations of NGC1275 Berg, Marcus; Conlon, Joseph P.; Day, Francesca The Astrophysical Journal, Vol. 847, Issue 2 https://doi.org/10.3847/1538-4357/aa8b16	journal	September 2017
Constraints on Axion-like Particles from X-Ray Observations of NGC1275 Berg, Marcus; Conlon, Joseph P.; Day, Francesca Apollo - University of Cambridge Repository https://doi.org/10.17863/cam.30168	text	January 2017
Interpreting the galactic center gamma-ray excess in the NMSSM Cao, Junjie; Shang, Liangliang; Wu, Peiwen arXiv https://doi.org/10.48550/arxiv.1506.06471	preprint	January 2015
Observation of the new emission line at ~3.5 keV in X-ray spectra of galaxies and galaxy clusters Iakubovskyi, Dmytro arXiv https://doi.org/10.48550/arxiv.1510.00358	text	January 2015
Searching for Decaying and Annihilating Dark Matter with Line Intensity Mapping Creque-Sarbinowski, Cyril; Kamionkowski, Marc arXiv https://doi.org/10.48550/arxiv.1806.11119	text	January 2018

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