<i>Z</i>′ portal to Chern-Simons Dark Matter

Arcadi, Giorgio; Ghosh, Pradipta; Mambrini, Yann; Pierre, Mathias; Queiroz, Farinaldo S.

doi:10.1088/1475-7516/2017/11/020

Cited by 29 publications

(19 citation statements)

References 176 publications

(275 reference statements)

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“…In this case, if the coupling between the dark matter particle and the mediator is sufficiently large, the main annihilation channel can be into a pair of short-lived mediators, which constitutes a paradigmatic secluded dark matter setup [33,73,[78][79][80][81][82][83]. Another viable secluded dark matter scenario occurs when the dark matter particle belongs to either a SU (N ) group [84][85][86], or a hidden valley setup [87,88], or interacts with SM particles via the Chern-Simons portal [89]. Either way, dark matter annihilation into short-lived mediators occur, and can be the most important final state.…”

Section: Secluded Dark Mattermentioning

confidence: 99%

Searching for secluded dark matter with H.E.S.S., Fermi-LAT, and Planck

Profumo

Queiroz

Silk

et al. 2018

J. Cosmol. Astropart. Phys.

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Short-lived mediators are often used to describe dark matter interactions with Standard Model particles. When the dark matter mass is heavier than the mass of the mediator, it may self-annihilate into short-lived mediators, and in some cases this might be the dominant annihilation channel. This scenario is known as secluded dark matter. We use Fermi-LAT observations of dwarf spheroidal galaxies, H.E.S.S. data from the Galactic center, and Planck measurements of the Cosmic Microwave Background to constrain secluded dark matter. We explore the interplay between these experiments and we assess the impact of the mediator mass on our bounds, an often overlooked yet very important point. In particular, we exclude pair -annihilation cross-sections greater or on the order of σv ∼ 4 × 10 −27 cm 3 /s for dark matter masses around 10 GeV and greater or on the order of σv ∼ ×10 −25 cm 3 /s for dark matter masses around a TeV. Our findings supersede previous constraints which use Fermi-LAT data, and constitute the first limits on secluded dark sectors using the H.E.S.S. telescope. We also show that one can fit TeV gamma-ray observations from H.E.S.S. with secluded dark matter annihilations, with the mediator mass impacting the best-fit dark matter particle mass. Our findings indicate that any assessment of secluded dark sectors in the context of indirect detection significantly depends on the choice of the mediator mass. 1 4πσv 4.4 × 10 −25 cm 3 /s Planck CMB 4b, M DM = 100 GeV CMB 4b, M DM = 1 TeV M DM M V → σv 2.5 × 10 −25 cm 3 /s M DM M V → σv 3 × 10 −24 cm 3 /s M DM ∼ M V → σv 2.5 × 10 −25 cm 3 /s M DM ∼ M V → σv 2.5 × 10 −24 cm 3 /s CMB 4e, M DM = 100 GeV CMB 4e, M DM = 1 TeV M DM M V → σv 10 −25 cm 3 /s M DM M V → σv 10 −24 cm 3 /s M DM ∼ M V → σv 1.5 × 10 −25 cm 3 /s M DM ∼ M V → σv 1.5 × 10 −24 cm 3 /s

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Section: Secluded Dark Mattermentioning

confidence: 99%

Searching for secluded dark matter with H.E.S.S., Fermi-LAT, and Planck

Profumo

Queiroz

Silk

et al. 2018

J. Cosmol. Astropart. Phys.

Self Cite

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“…This approach was further generalized by Preskill in Ref [36]. More recently, the influence of anomalous Z couplings to the SM gauge bosons has been studied in the context of DM [22,[37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

On dark matter interactions with the Standard Model through an anomalous Z′

Ismail

Katz

Racco

2017

J. High Energ. Phys.

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We study electroweak scale Dark Matter (DM) whose interactions with baryonic matter are mediated by a heavy anomalous Z . We emphasize that when the DM is a Majorana particle, its low-velocity annihilations are dominated by loop suppressed annihilations into the gauge bosons, rather than by p-wave or chirally suppressed annihilations into the SM fermions. Because the Z is anomalous, these kinds of DM models can be realized only as effective field theories (EFTs) with a well-defined cutoff, where heavy spectator fermions restore gauge invariance at high energies. We formulate these EFTs, estimate their cutoff and properly take into account the effect of the Chern-Simons terms one obtains after the spectator fermions are integrated out. We find that, while for light DM collider and direct detection experiments usually provide the strongest bounds, the bounds at higher masses are heavily dominated by indirect detection experiments, due to strong annihilation into W + W − , ZZ, Zγ and possibly into gg and γγ. We emphasize that these annihilation channels are generically significant because of the structure of the EFT, and therefore these models are prone to strong indirect detection constraints. Even though we focus on selected Z models for illustrative purposes, our setup is completely generic and can be used for analyzing the predictions of any anomalous Z -mediated DM model with arbitrary charges.

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“…On the one hand, in both cases the interaction required to generate a quantity of dark matter at present time in agreement with astrophysical measurement should be reasonably small and usually leads to invoke the existence of an extra mediator, whose role is to encode such low interactions between the dark and the visible sectors (see e.g. [20][21][22][23][24][25][26][27][28][29]). On the other hand, if thermal scenarios can ignore the physics of the reheating, non thermal scenario usually assume that no dark matter has been…”

Section: Introductionmentioning

confidence: 80%

The inflaton portal to dark matter

Heurtier

2017

J. High Energ. Phys.

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We consider the possibility that the inflaton is part of the dark sector and interacts with the standard model through a portal interaction with a heavy complex scalar field in equilibrium with the standard model at high energies. The inflaton and dark matter are encapsulated in a single complex field and both scalar sectors are charged under different (approximate) global U(1)'s such that the dark matter, as well as the visible pseudo-scalar are taken to be relatively light, as pseudo Nambu-Goldstone bosons of the theory. The dark matter relic density is populated by Freeze-In productions through the inflaton portal. In particular, after the reheating, production of dark matter by inflaton decay is naturally suppressed thanks to Planck stringent constraints on the dark quartic coupling, therefore preserving the non thermal scenario from any initial condition tuning.

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Z′ portal to Chern-Simons Dark Matter

Cited by 29 publications

References 176 publications

Searching for secluded dark matter with H.E.S.S., Fermi-LAT, and Planck

Searching for secluded dark matter with H.E.S.S., Fermi-LAT, and Planck

On dark matter interactions with the Standard Model through an anomalous Z′

The inflaton portal to dark matter

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