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2015

A Couplet from Flavored Dark Matter

Agrawal, Prateek, Chacko, Zackaria, Kilic, Can et al.

Understand

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 such a 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.
The ratios of the line energies are completely determined in terms of the charged lepton masses, and constitute a firm prediction of this framework.