Constraining the interaction strength between dark matter and visible matter: I. Fermionic dark matter

Zheng, Jiaming; Yu, Zhao-Huan; Shao, Junwen; Bi, X. J.; Li, Zhibing; Zhang, Honghao

doi:10.1016/j.nuclphysb.2011.09.009

Cited by 87 publications

(79 citation statements)

References 85 publications

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“…While direct detection experiments can give strong constraints for the vectors and the scalar mediator, the scattering of a pseudoscalar off a nucleus is strongly velocity dependent and vanishes in the nonrelativistic limit. Therefore, for pseudoscalars, taking existing limits into account [66,67], indirect detection experiments can result in stronger bounds than direct detection experiments [68,69]. For the simplified model of Eq.…”

Section: Direct and Indirect Detection Limitsmentioning

confidence: 99%

Constraining dark sectors at colliders: Beyond the effective theory approach

et al. 2015

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We outline and investigate a set of benchmark simplified models with the aim of providing a minimal simple framework for an interpretation of the existing and forthcoming searches of dark matter particles at the LHC. The simplified models we consider provide microscopic QFT descriptions of interactions between the Standard Model partons and the dark sector particles mediated by the four basic types of messenger fields: scalar, pseudoscalar, vector and axial-vector. Our benchmark models are characterized by four to five parameters, including the mediator mass and width, the dark matter mass and the effective coupling(s). In the gluon fusion production channel we resolve the top quark in the loop and compute full top-mass effects for scalar and pseudoscalar messengers. We show the LHC limits and reach at 8 and 14 TeV for models with all four messenger types. We also outline the complementarity of direct detection, indirect detection and LHC bounds for dark matter searches. Finally, we investigate the effects which arise from extending the simplified model to include potential new physics contributions in production. Using the scalar mediator as an example, we study the impact of heavy new physics loops which interfere with the top-mediated loops. Our computations are performed within the MCFM framework, and we provide fully flexible public Monte Carlo implementation.

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Section: Direct and Indirect Detection Limitsmentioning

confidence: 99%

Constraining dark sectors at colliders: Beyond the effective theory approach

et al. 2015

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“…Cosmicray flux data can also be taken together with other observations (like the dark matter relic density and the direct detection experimental results etc.) to give a combined constraint on dark matter models [40,41]. Besides a dark matter scenario, the others can provide astrophysical explanations which do not require the existence of new particles.…”

Section: Introductionmentioning

confidence: 99%

Pulsar interpretation of lepton spectra measured by AMS-02

Feng

Zhang

2016

Eur. Phys. J. C

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Alpha Magnetic Spectrometer (AMS-02) recently published its lepton spectra measurement. The results show that the positron fraction no longer increases above ∼200 GeV. The aim of this work is to investigate the possibility that the excess of positron fraction is due to pulsars. Nearby known pulsars from the ATNF catalog are considered to be a possible primary positron source of the high energy positrons. We find that the pulsars with age T (0.45−4.5) × 10 5 year and distance d < 0.5 kpc can explain the behavior of positron fraction of AMS-02 in the range of high energy. We show that each of the four pulsars-Geminga, J1741-2054, Monogem, and J0942-5552-is able to be a single source satisfying all considered physical requirements. We also discuss the possibility that these high energy e ± are from multiple pulsars. The multiple pulsar contribution predicts a positron fraction with some structures at higher energies.

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“…The first is based on exploiting effective operators describing the low energy interactions between the DM and the SM particles [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. This EFT approach manifestly does not depend on the UV structure of the (unknown) microscopic dark sector theory and works well when applied to the low energy experiments, such as the direct detection.…”

Section: Jhep06(2017)041mentioning

confidence: 99%

Simplified models of dark matter with a long-lived co-annihilation partner

Khoze

Plascencia

Sakurai

2017

J. High Energ. Phys.

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We introduce a new set of simplified models to address the effects of 3-point interactions between the dark matter particle, its dark co-annihilation partner, and the Standard Model degree of freedom, which we take to be the tau lepton. The contributions from dark matter co-annihilation channels are highly relevant for a determination of the correct relic abundance. We investigate these effects as well as the discovery potential for dark matter co-annihilation partners at the LHC. A small mass splitting between the dark matter and its partner is preferred by the co-annihilation mechanism and suggests that the co-annihilation partners may be long-lived (stable or meta-stable) at collider scales. It is argued that such long-lived electrically charged particles can be looked for at the LHC in searches of anomalous charged tracks. This approach and the underlying models provide an alternative/complementarity to the mono-jet and multi-jet based dark matter searches widely used in the context of simplified models with s-channel mediators. We consider four types of simplified models with different particle spins and coupling structures. Some of these models are manifestly gauge invariant and renormalizable, others would ultimately require a UV completion. These can be realised in terms of supersymmetric models in the neutralino-stau co-annihilation regime, as well as models with extra dimensions or composite models.

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Constraining the interaction strength between dark matter and visible matter: I. Fermionic dark matter

Cited by 87 publications

References 85 publications

Constraining dark sectors at colliders: Beyond the effective theory approach

Constraining dark sectors at colliders: Beyond the effective theory approach

Pulsar interpretation of lepton spectra measured by AMS-02

Simplified models of dark matter with a long-lived co-annihilation partner

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