Flavored dark matter and the Galactic Center gamma-ray excess

Agrawal, Prateek; Batell, Brian; Lin, Tongyan

doi:10.1103/physrevd.90.063512

Cited by 118 publications

(102 citation statements)

References 56 publications

(60 reference statements)

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“…Different flavors carry the same charges under the SM gauge groups, but have different couplings to the Higgs, and so differ in their masses. One interesting possibility, which has been receiving increased attention, is that DM, like the SM matter fields, also comes in three flavors [1][2][3][4][5][6][7][8][9][10][11] or has flavor-specific couplings to the SM [12][13][14][15]. Specific…”

Section: Introductionmentioning

confidence: 99%

A couplet from flavored dark matter

Agrawal

Chacko

Kılıç

et al. 2015

J. High Energ. Phys.

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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. 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. 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. The next generation of X-ray telescopes may have the necessary resolution to resolve the double line structure of such a couplet.

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Section: Introductionmentioning

confidence: 99%

A couplet from flavored dark matter

Agrawal

Chacko

Kılıç

et al. 2015

J. High Energ. Phys.

Self Cite

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“…If one pursues the alternative guiding principle of looking for a connection between DM and matter particles in the SM, one is then led to the possibility that DM itself may transform nontrivially under flavor symmetries. It is therefore worthwhile to consider classes of models with "Flavored Dark Matter" (FDM) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18], to look for universal features of such models, and to study whether there exist experimental signatures that may be used to distinguish FDM from more traditional models of DM, such as a neutralino in a supersymmetric setup. It is even possible that this line of inquiry may yield new insights in searching for the origin of the SM flavor structure.…”

Section: Introductionmentioning

confidence: 99%

Signatures of top flavored dark matter

Kılıç

Klimek

2015

Phys. Rev. D

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We study the experimental signatures of top flavored dark matter (top FDM) in direct detection searches and at the LHC. We show that for a dark matter mass above 200 GeV, top FDM can be consistent with current bounds from direct detection experiments and relic abundance constraints. We also show that next generation direct detection experiments will be able to exclude the entire perturbative parameter region for top FDM. For regions of parameter space where the flavor partners of top FDM are not readily produced, the LHC signatures of top FDM are similar to those of other models previously studied in the literature. For the case when the flavor partners are produced at the LHC, we study their impact on a search based on transverse mass variables and find that they diminish the signal significance. However, when the DM flavor partners are split in mass by less than 120-130 GeV, the LHC phenomenology becomes very distinctive through the appearance of displaced vertices. We also propose a strategy by which all parameters of the underlying model can be experimentally determined when the flavor partners can be observed.

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“…Scenarios featuring a pseudoscalar mediator with a significant invisible branching fraction [22,25,26,[43][44][45][46]. This results in distinctive missing energy signatures at the LHC which can be effectively probed by bb+MET, mono-jet, and other existing and planned LHC searches, as studied in detail in e.g.…”

Section: Jhep04(2015)046mentioning

confidence: 99%

Extending LHC coverage to light pseudoscalar mediators and coy dark sectors

Kozaczuk

Martin

2015

J. High Energ. Phys.

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Many dark matter models involving weakly interacting massive particles (WIMPs) feature new, relatively light pseudoscalars that mediate dark matter pair annihilation into Standard Model fermions. In particular, simple models of this type can explain the gamma ray excess originating in the Galactic Center as observed by the Fermi Large Area Telescope. In many cases the pseudoscalar's branching ratio into WIMPs is suppressed, making these states challenging to detect at colliders through standard dark matter searches. Here, we study the prospects for observing these light mediator states at the LHC without exploiting missing energy techniques. While existing searches effectively probe pseudoscalars with masses between 5-14 GeV and above 90 GeV, the LHC reach can be extended to cover much of the interesting parameter space in the intermediate 20-80 GeV mass range in which the mediator can have appreciable Yukawa-like couplings to Standard Model fermions but would have escaped detection by LEP and other experiments. Models explaining the Galactic Center excess via a light pseudoscalar mediator can give rise to a promising signal in this regime through the associated production of the mediator with bottom quarks while satisfying all other existing constraints. We perform an analysis of the backgrounds and trigger efficiencies, detailing the cuts that can be used to extract the signal. A significant portion of the otherwise unconstrained parameter space of these models can be conclusively tested at the 13 TeV LHC with 100 fb −1 , and we encourage the ATLAS and CMS collaborations to extend their existing searches to this mass range.

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Flavored dark matter and the Galactic Center gamma-ray excess

Cited by 118 publications

References 56 publications

A couplet from flavored dark matter

A couplet from flavored dark matter

Signatures of top flavored dark matter

Extending LHC coverage to light pseudoscalar mediators and coy dark sectors

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