Implications of unitarity and gauge invariance for simplified dark matter models

Kahlhoefer, Felix; Schmidt-Hoberg, Kai; Schwetz, Thomas; Vogl, Stefan

doi:10.1007/jhep02(2016)016

Cited by 201 publications

(271 citation statements)

References 78 publications

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“…It is important to first notice that the Z gauge boson arising from the L µ − L τ local symmetry dictates a dark matter phenomenology rather different from other realizations of a "dark Z portal" (see e.g. [67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84]). For example, the dark matter pair annihilation exclusively yields muon, tau, and neutrino pairs, as well as Z boson pairs, if kinematically allowed (i.e.…”

Section: Dark Matter Phenomenologymentioning

confidence: 99%

Explaining dark matter and B decay anomalies with an L μ − L τ model

Altmannshofer

Gori

Profumo

et al. 2016

J. High Energ. Phys.

179

118

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We present a dark sector model based on gauging the L µ − L τ symmetry that addresses anomalies in b → sµ + µ − decays and that features a particle dark matter candidate. The dark matter particle candidate is a vector-like Dirac fermion coupled to the Z gauge boson of the L µ − L τ symmetry. We compute the dark matter thermal relic density, its pair-annihilation cross section, and the loop-suppressed dark matter-nucleon scattering cross section, and compare our predictions with current and future experimental results. We demonstrate that after taking into account bounds from B s meson oscillations, dark matter direct detection, and the CMB, the model is highly predictive: B physics anomalies and a viable particle dark matter candidate, with a mass of ∼ (5 − 23) GeV, can be accommodated only in a tightly-constrained region of parameter space, with sharp predictions for future experimental tests. The viable region of parameter space expands if the dark matter is allowed to have L µ − L τ charges that are smaller than those of the SM leptons.

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Section: Dark Matter Phenomenologymentioning

confidence: 99%

Explaining dark matter and B decay anomalies with an L μ − L τ model

Altmannshofer

Gori

Profumo

et al. 2016

J. High Energ. Phys.

179

118

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show abstract

“…In this paper, we show that for simplified DM models with a pseudoscalar mediator, the minimal consistent SUð2Þ L × Uð1Þ Y gauge invariant completions to which these simplified models may be mapped yield a very different physical picture, signaling a failure of the simplified models to capture part of the key DM physics: these models are "oversimplified" (see [12][13][14][15][16][17][18][19] for recent discussions on this issue). We detail the physics that such simplified models are neglecting, and show that it has a critical impact on DM searches at the LHC.…”

Section: Introductionmentioning

confidence: 99%

Simplified models for dark matter face their consistent completions

2017

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Reprinted with permission from the American Physical Society: Physical Review D 95, 055027 c (2017) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Simplified dark matter models have been recently advocated as a powerful tool to exploit the complementarity between dark matter direct detection, indirect detection and LHC experimental probes. Focusing on pseudoscalar mediators between the dark and visible sectors, we show that the simplified dark matter model phenomenology departs significantly from that of consistent SUð2Þ L × Uð1Þ Y gauge invariant completions. We discuss the key physics that simplified models fail to capture, and its impact on LHC searches. Notably, we show that resonant mono-Z searches provide competitive sensitivities to standard mono-jet analyses at 13 TeV LHC.

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“…For recent examples and studies of such 'next-to-simplified models' we refer the reader to refs. [43][44][45][46][47][48][49].…”

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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Implications of unitarity and gauge invariance for simplified dark matter models

Cited by 201 publications

References 78 publications

Explaining dark matter and B decay anomalies with an L μ − L τ model

Explaining dark matter and B decay anomalies with an L μ − L τ model

Simplified models for dark matter face their consistent completions

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

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