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A couplet from flavored dark matter [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. High Energy Physics Division, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
21 pages : digital, PDF file
Additional Creators
Fermi National Accelerator Laboratory, United States. Department of Energy. High Energy Physics Division, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
We show that a couplet, a pair of closely spaced photon lines, in the X-ray spectrum is a distinctive feature of lepton flavored dark matter models for which the mass spectrum is dictated by Minimal Flavor Violation. In this scenario, mass splittings between different dark matter flavors are determined by Standard Model Yukawa couplings and can naturally be small, allowing all three flavors to be long-lived and contribute to the observed abundance. Then, in the presence of a tiny source of flavor violation, heavier dark matter flavors can decay via a dipole transition on cosmological timescales, giving rise to three photon lines. Two of these lines are closely spaced, and constitute the couplet. Provided the flavor violation is sufficiently small, the ratios of the line energies are determined in terms of the charged lepton masses, and constitute a prediction of this framework. Furthermore, for dark matter masses of order the weak scale, the couplet lies in the keV-MeV region, with a much weaker line in the eV-keV region. This scenario constitutes a potential explanation for the recent claim of the observation of a 3.5 keV line. As a result, the next generation of X-ray telescopes may have the necessary resolution to resolve the double line structure of such a couplet.
Report Numbers
E 1.99:fermilab-pub--15-059-t
E 1.99: tcc--001-15
E 1.99: uttg--06-15
uttg--06-15
tcc--001-15
fermilab-pub--15-059-t
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Note
Published through SciTech Connect.
08/17/2015.
"fermilab-pub--15-059-t"
" tcc--001-15"
" uttg--06-15"
"arXiv eprint number arXiv:1503.03057"
Journal of High Energy Physics (Online) 2015 8 ISSN 1029-8479 AM
Agrawal, Prateek; Chacko, Zackaria; Kilic, Can; Verhaaren, Christopher.
Funding Information
AC02-07CH11359
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