The windows for kinetically mixed Z′-mediated dark matter and the galactic center gamma ray excess

Cline, James M.; Dupuis, Grace; Liu, Zuowei; Xue, Wei

doi:10.1007/jhep08(2014)131

Cited by 125 publications

(139 citation statements)

References 48 publications

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“…It is important to first notice that the Z gauge boson arising from the L µ − L τ local symmetry dictates a dark matter phenomenology rather different from other realizations of a "dark Z portal" (see e.g. [67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84]). For example, the dark matter pair annihilation exclusively yields muon, tau, and neutrino pairs, as well as Z boson pairs, if kinematically allowed (i.e.…”

Section: Dark Matter Phenomenologymentioning

confidence: 99%

Explaining dark matter and B decay anomalies with an L μ − L τ model

Altmannshofer

Gori

Profumo

et al. 2016

J. High Energ. Phys.

175

118

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We present a dark sector model based on gauging the L µ − L τ symmetry that addresses anomalies in b → sµ + µ − decays and that features a particle dark matter candidate. The dark matter particle candidate is a vector-like Dirac fermion coupled to the Z gauge boson of the L µ − L τ symmetry. We compute the dark matter thermal relic density, its pair-annihilation cross section, and the loop-suppressed dark matter-nucleon scattering cross section, and compare our predictions with current and future experimental results. We demonstrate that after taking into account bounds from B s meson oscillations, dark matter direct detection, and the CMB, the model is highly predictive: B physics anomalies and a viable particle dark matter candidate, with a mass of ∼ (5 − 23) GeV, can be accommodated only in a tightly-constrained region of parameter space, with sharp predictions for future experimental tests. The viable region of parameter space expands if the dark matter is allowed to have L µ − L τ charges that are smaller than those of the SM leptons.

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Section: Dark Matter Phenomenologymentioning

confidence: 99%

Explaining dark matter and B decay anomalies with an L μ − L τ model

Altmannshofer

Gori

Profumo

et al. 2016

J. High Energ. Phys.

175

118

View full text Add to dashboard Cite

show abstract

“…For a more detailed discussion of the resulting gamma-ray spectrum in a similar scenario, see [29]. Other models where the gamma-ray signal originates from annihilations in a hidden sector have been previously considered in [30][31][32][33][34][35][36][37].…”

Section: The Gamma-ray Signalmentioning

confidence: 99%

Galactic centre GeV photons from dark technicolor

Heikinheimo

Spethmann

2014

J. High Energ. Phys.

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We present a classically scale-invariant model with a confining dark sector, which is coupled to the Standard Model through the Higgs portal. The galactic centre gamma ray excess can be explained in this model by collision-induced dark matter decays to b-quarks. We discuss the possibility to obtain the dark matter relic density through thermal freeze-out, which however requires excessive fine-tuning. We then instead focus on a freeze-in scenario and perform detailed calculations and a parameter scan. We find that the observed relic density and the gamma ray excess can be explained by a wide range of parameters in this model.

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“…[22] performed a similar analysis to ours with an older data, without computing indirect DM detection and g-2 bounds, and assumed Z − up quarks and Z − down quarks to be the same, whereas in Ref. [23] the kinetic mixing window has been explored. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Dark matter complementarity and theZ′portal

et al. 2015

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Z gauge bosons arise in many particle physics models as mediators between the dark and visible sectors. We exploit dark matter complementarity and derive stringent and robust collider, direct and indirect constraints, as well as limits from the muon magnetic moment. We rule out almost the entire region of the parameter space that yields the right dark matter thermal relic abundance, using a generic parametrization of the Z -fermion couplings normalized to the Standard Model Z-fermion couplings for dark matter masses in the 8 GeV-5 TeV range. We conclude that mediators lighter than 2.1 TeV are excluded regardless of the DM mass, and that depending on the Z − f ermion coupling strength much heavier masses are needed to reproduce the DM thermal relic abundance while avoiding existing limits.

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The windows for kinetically mixed Z′-mediated dark matter and the galactic center gamma ray excess

Cited by 125 publications

References 48 publications

Explaining dark matter and B decay anomalies with an L μ − L τ model

Explaining dark matter and B decay anomalies with an L μ − L τ model

Galactic centre GeV photons from dark technicolor

Dark matter complementarity and theZ′portal

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