Class of Higgs-portal dark matter models in the light of gamma-ray excess from galactic center

Mondal, Tanmoy; Basak, Tanushree

doi:10.1016/j.physletb.2015.03.055

Cited by 46 publications

(22 citation statements)

References 56 publications

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“…On the other hand, the recent AMS-02 data on the cosmic-ray antiproton flux [22,23] has begun to exclude states in which a qq final state dominates [24]. Concrete models in which the dark-matter candidate annihilates primarily to bb [25][26][27][28][29][30] and to l þ l − [31,32] have also been identified. Indeed, additional studies on other final states [13] and generic model constraints [33] have established that there exist further SM channels through which a dark-matter particle can annihilate or decay and reproduce the observed excess.…”

Section: Introductionmentioning

confidence: 99%

Boxes, boosts, and energy duality: Understanding the Galactic Center gamma-ray excess through Dynamical Dark Matter

et al. 2017

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Many models currently exist which attempt to interpret the excess of gamma rays emanating from the Galactic Center in terms of annihilating or decaying dark matter. These models typically exhibit a variety of complicated cascade mechanisms for photon production, leading to a nontrivial kinematics which obscures the physics of the underlying dark sector. In this paper, by contrast, we observe that the spectrum of the gamma-ray excess may actually exhibit an intriguing "energy-duality" invariance under E γ → E 2 Ã =E γ for some E Ã . As we shall discuss, such an energy duality points back to a remarkably simple alternative kinematics which in turn is realized naturally within the Dynamical Dark Matter framework. Observation of this energy duality could therefore provide considerable information about the properties of the dark sector from which the Galactic Center gamma-ray excess might arise, and highlights the importance of acquiring more complete data for the Galactic Center excess in the energy range around 1 GeV.

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Section: Introductionmentioning

confidence: 99%

Boxes, boosts, and energy duality: Understanding the Galactic Center gamma-ray excess through Dynamical Dark Matter

et al. 2017

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“…The large uncertainties involved in the interpretation of FermiLAT data have been recently analyzed by the FermiLAT collaboration [26] concluding that a GRE excess in a region around 3 GeV indeed exists, but a broad band of possible values for the corresponding differential flux as a function of the photon energy is permitted by these uncertainties. Although the GRE can be explained by little known astrophysical sources [15,[27][28][29][30][31], the annihilation of dark matter into final states containing photons remains as an attractive possibility [4,21,[32][33][34][35][36][37][38][39][40] and we work out here the results for dark matter with a (1, 0) ⊕ (0, 1) space-time structure.…”

Section: Gre Prompt Photons and Muon Inverse Compton Scatteringmentioning

confidence: 99%

Spin-one dark matter and gamma ray signals from the galactic center

Hernández-Arellano

Napsuciale

Rodríguez

2020

J. High Energ. Phys.

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In this work we study the possibility that the gamma ray excess (GRE) at the Milky Way galactic center come from the annihilation of dark matter with a (1, 0) ⊕ (0, 1) space-time structure (spin-one dark matter, SODM). We calculate the production of prompt photons from initial state radiation, internal bremsstrahlung, final state radiation including the emission from the decay products of the µ, τ or hadronization of quarks. Next we study the delayed photon emission from the inverse Compton scattering (ICS) of electrons (produced directly or in the prompt decay of µ, τ leptons or in the hadronization of quarks produced in the annihilation of SODM) with the cosmic microwave background or starlight. All these mechanisms yield significant contributions only for Higgs resonant exchange, i.e. for M ≈ M H /2, and the results depend on the Higgs scalar coupling to SODM, g s. The dominant mechanism at the GRE bump is the prompt photon production in the hadronization of b quarks produced inDD →bb, whereas the delayed photon emission from the ICS of electrons coming from the hadronization of b quarks produced in the same reaction dominates at low energies (ω < 0.3 GeV) and prompt photons from c and τ , as well as from internal bremsstrahlung, yield competitive contributions at the end point of the spectrum (ω ≥ 30 GeV). Taking into account all these contributions, our results for photons produced in the annihilation of SODM are in good agreement with the GRE data for g s ∈ [0.98, 1.01]×10 −3 and M ∈ [62.470, 62.505] GeV. We study the consistency of the corresponding results for the dark matter relic density, the spin-independent dark matter-nucleon cross-section σ p and the cross section for the annihilation of dark matter intobb, τ + τ − , µ + µ − and γγ, taking into account the Higgs resonance effects, finding consistent results in all cases.

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“…In Figure 1 we show the projected sensitivity of CTA assuming the optimistic case of an NFW DM profile [74], for 5 Direct detection bounds on models with low mass DM are weak, but these are ruled out by indirect detection constraints from Fermi and observations of the cosmic microwave background. 6 The galactic centre might be easier to fit in more complex Higgs portal models [71][72][73].…”

Section: Direct Indirect and Collider Constraintsmentioning

confidence: 99%

Higgs portal dark matter in non-standard cosmological histories

Hardy

2018

J. High Energ. Phys.

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A scalar particle with a relic density set by annihilations through a Higgs portal operator is a simple and minimal possibility for dark matter. However, assuming a thermal cosmological history this model is ruled out over most of parameter space by collider and direct detection constraints. We show that in theories with a non-thermal cosmological history Higgs portal dark matter is viable for a wide range of dark matter masses and values of the portal coupling, evading existing limits. In particular, we focus on the string theory motivated scenario of a period of late time matter domination due to a light modulus with a decay rate that is suppressed by the Planck scale. Dark matter with a mass GeV is possible without additional hidden sector states, and this can have astrophysically relevant self-interactions. We also study the signatures of such models at future direct, indirect, and collider experiments. Searches for invisible Higgs decays at the high luminosity LHC or an e + e − collider could cover a significant proportion of the parameter space for low mass dark matter, and future direct detection experiments will play a complementary role.1 The phenomenology is very similar if the DM is a complex or real scalar, we take it to be real throughout. 2 This is assuming the coupling λ is not very small. If λ is tiny, ∼ 10 −10 , the DM relic abundance could be generated from freeze in [5,6]. 4 There might be a relatively minor inaccuracy in our calculation of the relic abundance for DM masses

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Class of Higgs-portal dark matter models in the light of gamma-ray excess from galactic center

Cited by 46 publications

References 56 publications

Boxes, boosts, and energy duality: Understanding the Galactic Center gamma-ray excess through Dynamical Dark Matter

Boxes, boosts, and energy duality: Understanding the Galactic Center gamma-ray excess through Dynamical Dark Matter

Spin-one dark matter and gamma ray signals from the galactic center

Higgs portal dark matter in non-standard cosmological histories

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