Signatures of Majorana dark matter with t-channel mediators

Garny, Mathias; Ibarra, Alejandro; Vogl, Stefan

doi:10.1142/s0218271815300190

Cited by 82 publications

(151 citation statements)

References 214 publications

(220 reference statements)

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“…[49]. But our case turns out to be significantly different, due to the appearance of both φ and φ e mediators.…”

Section: Jhep03(2016)106 4 Leptophilic Dm: Relic Density and Direct Detmentioning

confidence: 54%

Naturally large radiative lepton flavor violating Higgs decay mediated by lepton-flavored dark matter

Baek¹,

Kang²

2016

J. High Energ. Phys.

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In the standard model (SM), lepton flavor violating (LFV) Higgs decay is absent at renormalizable level and thus it is a good probe to new physics. In this article we study a type of new physics that could lead to large LFV Higgs decay, i.e., a lepton-flavored dark matter (DM) model which is specified by a Majorana DM and scalar lepton mediators. Different from other similar models with similar setup, we introduce both left-handed and right-handed scalar leptons. They allow large LFV Higgs decay and thus may explain the tentative Br(h → τ µ) ∼ 1% experimental results from the LHC. In particular, we find that the stringent bound from τ → µγ can be naturally evaded. One reason, among others, is a large chirality violation in the mediator sector. Aspects of relic density and especially radiative direct detection of the leptonic DM are also investigated, stressing the difference from previous lepton-flavored DM models.

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“…[49]. But our case turns out to be significantly different, due to the appearance of both φ and φ e mediators.…”

Section: Jhep03(2016)106 4 Leptophilic Dm: Relic Density and Direct Detmentioning

confidence: 54%

Naturally large radiative lepton flavor violating Higgs decay mediated by lepton-flavored dark matter

Baek¹,

Kang²

2016

J. High Energ. Phys.

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“…Limits from SUSY searches cannot be straightforwardly applied to the scenario under consideration since the pair production cross-section of the scalar mediator field is enhanced by the presence of diagrams with t/u channel exchange of the DM (the corresponding diagrams in SUSY are suppressed since the concerned couplings of the neutralino with quarks and squarks cannot be of O (1)). We have then applied the limits from the dedicated studies [140,284] (see also [285,286]), in which searches of both monojet and dijet + missing energy events have been considered, and reported them in the bottom panel of Fig. 17 (orange region with dashed orange border).…”

Section: T-channel Portalsmentioning

confidence: 99%

The waning of the WIMP? A review of models, searches, and constraints

et al. 2018

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Weakly Interacting Massive Particles (WIMPs) are among the best-motivated dark matter candidates. No conclusive signal, despite an extensive search program that combines, often in a complementary way, direct, indirect, and collider probes, has been detected so far. This situation might change in near future due to the advent of one/multi-TON Direct Detection experiments. We thus, find it timely to provide a review of the WIMP paradigm with focus on a few models which can be probed at best by these facilities. Collider and Indirect Detection, nevertheless, will not be neglected when they represent a complementary probe.

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“…Of course, at LHC energies the contact operator approximation may break down if the particle mediating dark sector-SM interactions has a mass around or below the typical partonic center of mass energies of the LHC [54,[64][65][66][67][68][69]. Therefore, in the recent literature simplified models are gaining in importance [12,[70][71][72][73][74][75][76][77]. The usefulness of EFTs and simplified models is illustrated by studies of higher order QCD corrections to DM production at the LHC [78][79][80][81].…”

Section: Jhep12(2015)120mentioning

confidence: 99%

The coannihilation codex

Baker

Brod

Hedri

et al. 2015

J. High Energ. Phys.

121

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We present a general classification of simplified models that lead to dark matter (DM) coannihilation processes of the form DM + X → SM 1 + SM 2 , where X is a coannihilation partner for the DM particle and SM 1 , SM 2 are Standard Model fields. Our classification also encompasses regular DM pair annihilation scenarios if DM and X are identical. Each coannhilation scenario motivates the introduction of a mediating particle M that can either belong to the Standard Model or be a new field, whereby the resulting interactions between the dark sector and the Standard Model are realized as tree-level and dimension-four couplings. We construct a basis of coannihilation models, classified by the SU(3) C × SU(2) L × U(1) Y quantum numbers of DM, X and M. Our main assumptions are that dark matter is an electrically neutral color singlet and that all new particles are either scalars, Dirac or Majorana fermions, or vectors. We illustrate how new scenarios arising from electroweak symmetry breaking effects can be connected to our electroweak symmetric simplified models. We offer a comprehensive discussion of the phenomenological features of our models, encompassing the physics of thermal freeze-out, direct and indirect detection constraints, and in particular searches at the Large Hadron Collider (LHC). Many novel signatures that are not covered in current LHC searches are emphasized, and new and improved LHC analyses tackling these signatures are proposed. We discuss how the coannihilation simplified models can be used to connect results from all classes of experiments in a straightforward and transparent way. This point is illustrated with a detailed discussion of the phenomenology of a particular simplified model featuring leptoquark-mediated dark matter coannihilation.

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Signatures of Majorana dark matter with t-channel mediators

Cited by 82 publications

References 214 publications

Naturally large radiative lepton flavor violating Higgs decay mediated by lepton-flavored dark matter

Naturally large radiative lepton flavor violating Higgs decay mediated by lepton-flavored dark matter

The waning of the WIMP? A review of models, searches, and constraints

The coannihilation codex

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