Updated collider and direct detection constraints on Dark Matter models for the Galactic Center gamma-ray excess

Escudero, Miguel; Witte, Samuel J.

doi:10.1088/1475-7516/2017/02/038

Cited by 21 publications

(19 citation statements)

References 130 publications

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“…In particular, a distinct change of behavior of the flux is expected at a threshold energy given by the WIMP mass. Presently WIMP masses of ∼ 50 GeV near the Z • pole are still consistent with particle collider experiments in a variety of models and have been proposed as an explanation for the observed γ-ray excess from the center of the galaxy [48][49][50][51][52]. Also, a recent analysis of the AMS-02 antiproton flux data appears to be consistent with a WIMP mass of about 50 GeV [53,54].…”

Section: Wimp Annihilation and Other New Physicssupporting

confidence: 54%

“…3 can have many origins, ranging from conventional astrophysical explanations to more speculative explanations such as dark matter annihilations and/or decay. Let us here concentrate on a possible interpretation in terms of WIMP physics, following the ideas presented in [48][49][50][51][52][53][54]. If there is a weakly interacting massive particle (WIMP) underlying dark matter, then WIMP annihilation and/or WIMP decay can modify the relative abundance of e + and e − flux.…”

Section: Wimp Annihilation and Other New Physicsmentioning

confidence: 99%

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Generalized statistical mechanics of cosmic rays: Application to positron-electron spectral indices

Yalçın

Beck

2018

Sci Rep

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Cosmic ray energy spectra exhibit power law distributions over many orders of magnitude that are very well described by the predictions of q-generalized statistical mechanics, based on a q-generalized Hagedorn theory for transverse momentum spectra and hard QCD scattering processes. QCD at largest center of mass energies predicts the entropic index to be q = 11. Here we show that the escort duality of the nonextensive thermodynamic formalism predicts an energy split of effective temperature given byMeV, where T H is the Hagedorn temperature. We carefully analyse the measured data of the AMS-02 collaboration and provide evidence that the predicted temperature split is indeed observed, leading to a different energy dependence of the e + and e − spectral indices. We also observe a distinguished energy scale E * ≈ 50 GeV where the e + and e − spectral indices differ the most. Linear combinations of the escort and non-escort q-generalized canonical distributions yield excellent agreement with the measured AMS-02 data in the entire energy range.Statistical mechanics is a universal formalism based on the maximization of the Boltzmann-Gibbs-Shannon entropy subject to suitable constraints. Despite its universal validity and success for short-range equilibrium systems, the applicability of the Boltzmann-Gibbs formalism has severe restrictions: It is not valid for nonequilibrium systems, it is not valid for systems with long-range interactions (such as gravity), and it is not valid for systems with a very small volume and fluctuating temperature (as probed in scattering processes of cosmic ray particles at very high energies). For these types of complex systems it is useful to generalize the formalism to a more general setting, based on the maximization of more general entropy measures which contain the Shannon entropy as a special case. Probably the most popular one of these generalizations is based on q-entropy (or Tsallis entropy), which leads to power law distributions (the so-called q-exponentials), but other generalized entropic approaches are possible as well [1][2][3][4][5][6][7][8] . In high energy physics, a recent success of the q-generalized approach is that excellent fits of measured transverse momentum spectra in high energy scattering experiments have been obtained 9 , based on an extension of Hagedorn's theory 10-12 to a q-generalized version and a generalized thermodynamic theory [13][14][15][16][17][18][19] . This includes recent experiments in the TeV region for pp and pp collisions 9,20-25 but there is also early work on cosmic ray spectra 26,27 and e + e − annihilation 15,28,29 . In this paper we systematically investigate the relevant degrees of freedom of the q-generalized statistical mechanics formalism at highest center of mass energies and develop an effective theory of energy spectra of cosmic rays, which are produced by scattering processes at extremely high energies (e.g. supernovae explosions). Some remarkable predictions come out of the formalism in its full generality. First of all, the para...

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Section: Wimp Annihilation and Other New Physicssupporting

confidence: 54%

Section: Wimp Annihilation and Other New Physicsmentioning

confidence: 99%

Generalized statistical mechanics of cosmic rays: Application to positron-electron spectral indices

Yalçın

Beck

2018

Sci Rep

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“…In light of recent results from both direct dark matter searches and the LHC, dark matter models that are capable of generating the Galactic Center gamma-ray excess have become increasingly tightly constrained [53]. It is straightforward to evade these constraints, however, within the context of models in which the dark matter does not directly couple to the Standard Model, but instead annihilates into unstable particles that reside within a hidden sector.…”

Section: Discussionmentioning

confidence: 99%

Hidden sector dark matter and the Galactic Center gamma-ray excess: a closer look

Escudero

Witte

Hooper

2017

J. Cosmol. Astropart. Phys.

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Abstract. Stringent constraints from direct detection experiments and the Large HadronCollider motivate us to consider models in which the dark matter does not directly couple to the Standard Model, but that instead annihilates into hidden sector particles which ultimately decay through small couplings to the Standard Model. We calculate the gamma-ray emission generated within the context of several such hidden sector models, including those in which the hidden sector couples to the Standard Model through the vector portal (kinetic mixing with Standard Model hypercharge), through the Higgs portal (mixing with the Standard Model Higgs boson), or both. In each case, we identify broad regions of parameter space in which the observed spectrum and intensity of the Galactic Center gamma-ray excess can easily be accommodated, while providing an acceptable thermal relic abundance and remaining consistent with all current constraints. We also point out that cosmic-ray antiproton measurements could potentially discriminate some hidden sector models from more conventional dark matter scenarios.

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“…One way of circumventing the direct detection constraints for Higgs portal models is by taking the DM to be fermionic, coupling to b quarks through a pseudoscalar such that DM-nucleon interactions are spin-dependent and velocity-suppressed [36][37][38][39][40]. Here we will use a different strategy, taking advantage of an approximate symmetry, following refs.…”

Section: Introductionmentioning

confidence: 99%

Pseudo-Goldstone dark matter confronts cosmic ray and collider anomalies

Cline

Toma

2019

Phys. Rev. D

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Persistent excesses in the spectra of gamma rays from the galactic center and cosmic ray antiprotons can be explained by dark matter of mass 50 ∼ 65 GeV annihilating into b quarks, but this is typically hard to reconcile with direct detection constraints. We resolve this tension using a simple class of models, where dark matter is a pseudo-Nambu-Goldstone boson, having naturally momentum-suppressed couplings to nuclei. Exploring the parameter space of the model, we find that it can explain the cosmic ray anomalies while remaining compatible with constraints from the relic abundance and annihilation in dwarf spheroidal galaxies. In certain regions of parameter space, the Higgs-dark matter coupling can help stabilize the Higgs potential up to the Planck scale. The scalar partner of the dark matter is an extra Higgs boson, that can explain a tentative diphoton excess observed by CMS, and an excess of bb signal from LEP, if its mass is ∼ 96 GeV and the model is extended to include a heavy scalar quark. This extended model predicts a monochromatic gamma-ray line near 64 GeV, at a level close to current experimental sensitivity, from dark matter annihilations in the galaxy.

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Updated collider and direct detection constraints on Dark Matter models for the Galactic Center gamma-ray excess

Cited by 21 publications

References 130 publications

Generalized statistical mechanics of cosmic rays: Application to positron-electron spectral indices

Generalized statistical mechanics of cosmic rays: Application to positron-electron spectral indices

Hidden sector dark matter and the Galactic Center gamma-ray excess: a closer look

Pseudo-Goldstone dark matter confronts cosmic ray and collider anomalies

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