AMS02 positron excess from decaying fermion DM with local dark gauge symmetry

Ko, Pyungwon; Tang, Yong

doi:10.1016/j.physletb.2015.01.001

Cited by 11 publications

(8 citation statements)

References 99 publications

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“…First of all, let us consider DM models where weak scale DM is stabilized by some spontaneously broken local dark gauge symmetries [14][15][16][17][18][19][20][21][22][23][24][25]. This possibility is not that often JHEP10 (2015)057 considered seriously.…”

Section: Dark Matter Models With Dark Gauge Symmetries And/or Higgs Pmentioning

confidence: 99%

Bounds on Higgs-portal models from the LHC Higgs data

Cheung

Ko²,

Lee

et al. 2015

J. High Energ. Phys.

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In a number of Higgs-portal models, an SU(2) isospin-singlet scalar boson generically appears at the electroweak scale and can mix with the Standard Model (SM) Higgs boson with a mixing angle α. This singlet scalar boson can have renormalizable couplings to a pair of dark matter particles, vector-like leptons or quarks, or new gauge bosons, thereby modifying the Higgs signal strengths in a nontrivial way. In this work, we perform global fits to such models using the most updated LHC Higgs-boson data and discuss the corresponding implications on Higgs-portal-type models. In particular we find that the current LHC Higgs-boson data slightly favors the SM over the Higgs-portal singlet-scalar models, which has to be further examined using the upcoming LHC Higgsboson data. Finally, without non-SM particles contributing to the Hγγ and Hgg vertices, the Higgs-portal models are constrained as follows: cos α 0.86 and ∆Γ tot 1.24 MeV at 95% confidence level (CL).

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Section: Dark Matter Models With Dark Gauge Symmetries And/or Higgs Pmentioning

confidence: 99%

Bounds on Higgs-portal models from the LHC Higgs data

Cheung

Ko²,

Lee

et al. 2015

J. High Energ. Phys.

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“…In contrast, decaying DM does not require a large boost factor as long as the decay lifetime is around 10 26 to 10 27 seconds [41][42][43][44][45][46][47][48][49][50], depending on the DM mass and decay channels. The γ-ray bound, nevertheless, still applies in this case and has ruled out many decaying DM models based on two-body decays [51][52][53][54][55].…”

Section: Introductionmentioning

confidence: 99%

AMS-02 positron excess and indirect detection of three-body decaying dark matter

Cheng

Huang

et al. 2017

J. Cosmol. Astropart. Phys.

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We consider indirect detection of meta-stable dark matter particles decaying into a stable neutral particle and a pair of standard model fermions. Due to the softer energy spectra from the three-body decay, such models could potentially explain the AMS-02 positron excess without being constrained by the Fermi-LAT gamma-ray data and the cosmic ray anti-proton measurements. We scrutinize over different final state fermions, paying special attention to handling of the cosmic ray background and including various contributions from cosmic ray propagation with the help of the LikeDM package. It is found that primary decays into an electron-positron pair and a stable neutral particle could give rise to the AMS-02 positron excess and, at the same time, stay unscathed against the gamma-ray and antiproton constraints. Decays to a muon pair or a mixed flavor electron-muon pair may also be viable depending on the propagation models. Decays to all other standard model fermions are severely disfavored.

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“…It is natural to assume that DM may have some kind of (its own) gauge symmetries [26][27][28][29][30][31][32][33][34][35][36][37][38]. And then there could be other extra dark fields (such as dark Higgs or dark gauge fields) which might be not that heavy and so we may have to include them in our simplified models.…”

Section: Jhep01(2017)086mentioning

confidence: 99%

Simplified DM models with the full SM gauge symmetry: the case of t-channel colored scalar mediators

Ko¹,

Natale²,

Park

et al. 2017

J. High Energ. Phys.

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Abstract:The general strategy for dark matter (DM) searches at colliders currently relies on simplified models. In this paper, we propose a new t-channel UV-complete simplified model that improves the existing simplified DM models in two important respects: (i) we impose the full SM gauge symmetry including the fact that the left-handed and the righthanded fermions have two independent mediators with two independent couplings, and (ii) we include the renormalization group evolution when we derive the effective Lagrangian for DM-nucleon scattering from the underlying UV complete models by integrating out the t-channel mediators. The first improvement will introduce a few more new parameters compared with the existing simplified DM models. In this study we look at the effect this broader set of free parameters has on direct detection and the mono-X + MET (X=jet,W, Z) signatures at 13 TeV LHC while maintaining gauge invariance of the simplified model under the full SM gauge group. We find that the direct detection constraints require DM masses less than 10 GeV in order to produce phenomenologically interesting collider signatures. Additionally, for a fixed mono-W cross section it is possible to see very large differences in the mono-jet cross section when the usual simplified model assumptions are loosened and isospin violation between RH and LH DM-SM quark couplings are allowed.

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AMS02 positron excess from decaying fermion DM with local dark gauge symmetry

Cited by 11 publications

References 99 publications

Bounds on Higgs-portal models from the LHC Higgs data

Bounds on Higgs-portal models from the LHC Higgs data

AMS-02 positron excess and indirect detection of three-body decaying dark matter

Simplified DM models with the full SM gauge symmetry: the case of t-channel colored scalar mediators

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