Contact interactions and top-philic scalar dark matter

Cornell, Alan S.; Deandrea, Aldo; Flacke, Thomas; Fuks, Benjamin; Mason, L. H.

doi:10.1007/jhep07(2021)026

Cited by 5 publications

(4 citation statements)

References 56 publications

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“…The one at M χ 0 ∼ M S 1 /2 arises from resonantly enhanced co-annihilations via an s-channel leptoquark exchange, while the one at M χ 0 ∼ M S 1 is due to the opening of the χ 0 χ 0 → S 1 S 1 annihilation process. Qualitatively, the phenomenology is very similar to the one of the top-philic parent models studied in [90,[95][96][97], so that for M χ 0 < M S 1 /2 loop-induced DM annihilations into gluons can become important. This configuration is, however, ignored here.…”

Section: Relic Densitymentioning

confidence: 67%

Leptoquark manoeuvres in the dark: a simultaneous solution of the dark matter problem and the $$ {R}_{D^{\left(\ast \right)}} $$ anomalies

Bélanger

Bharucha

Fuks

et al. 2022

J. High Energ. Phys.

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The measured branching fractions of B-mesons into leptonic final states derived by the LHCb, Belle and BaBar collaborations hint towards the breakdown of lepton flavour universality. In this work we take at face value the so-called $$ {R}_{D^{\left(\ast \right)}} $$ R D ∗ observables that are defined as the ratios of neutral B-meson charged-current decays into a D(*)-meson, a charged lepton and a neutrino final state in the tau and light lepton channels. A well-studied and simple solution to this charged current anomaly is to introduce a scalar leptoquark S1 that couples to the second and third generation of fermions. We investigate how S1 can also serve as a mediator between the Standard Model and a dark sector. We study this scenario in detail and estimate the constraints arising from collider searches for leptoquarks, collider searches for missing energy signals, direct detection experiments and the dark matter relic abundance. We stress that the production of a pair of leptoquarks that decays into different final states (i.e. the commonly called “mixed” channels) provides critical information for identifying the underlying dynamics, and we exemplify this by studying the tτbν and the resonant S1 plus missing energy channels. We find that direct detection data provides non-negligible constraints on the leptoquark coupling to the dark sector, which in turn affects the relic abundance. We also show that the correct relic abundance can not only arise via standard freeze-out, but also through conversion-driven freeze-out. We illustrate the rich phenomenology of the model with a few selected benchmark points, providing a broad stroke of the interesting connection between lepton flavour universality violation and dark matter.

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Section: Relic Densitymentioning

confidence: 67%

Leptoquark manoeuvres in the dark: a simultaneous solution of the dark matter problem and the $$ {R}_{D^{\left(\ast \right)}} $$ anomalies

Bélanger

Bharucha

Fuks

et al. 2022

J. High Energ. Phys.

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“…Similarly, one could also consider a Z + / E T signal if there is a ZP 1/2 H coupling. For quite some time, therefore, it has been pointed out [22,[25][26][27][28][29][30] that simplified models may, in fact, be over-simplified. It is thus reasonable to examine so-called 'lesssimplified models', where the dark sector includes more than one field χ i (i = 1, 2, .…”

Section: Jhep07(2022)111mentioning

confidence: 99%

“…For example, if a less-simplified model has two pseudoscalar mediators X 1 and X 2 with X 1 significantly more massive than X 2 , and if there exists an HX 1 X 2 coupling, then it will be easy to generate not just a mono-jet signal through pp → X * 1,2 j → χ i χj j (with i, j = 1, 2), but also a mono-Higgs signal through pp → X * 1 → H +X 2 → H +χ i χj , as well as the analogous Z + / E T signal. For these reasons, less-simplified models have been an increasingly popular approach in recent times [29,30].…”

Section: Jhep07(2022)111mentioning

confidence: 99%

Phenomenological analysis of multi-pseudoscalar mediated dark matter models

Banerjee

Bélanger

Bhatia

et al. 2022

J. High Energ. Phys.

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Non-minimal simplified extensions of the Standard Model have gained considerable currency in the context of dark matter searches at the LHC, since they predict enhanced mono-Higgs and mono-W/Z signatures over large parts of the parameter space. However, these non-minimal models obviously lack the simplicity and directness of the original simplified models, and are more heavily dependent on the model assumptions. We propose to classify these models generically on the basis of additional mediator(s) and dark matter particles. As an example, we take up a scenario involving multiple pseudoscalar mediators, and a single Dirac dark matter particle, the latter being a popular introduction to ensure ultraviolet completion of theories with multiple pseudoscalar fields. In the chosen scenario, we discuss the viable channels and signatures of relevance at the future runs of the LHC. These are then compared with the minimal simplified scenarios and distinguishing features are pinpointed.

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“…This paradigm has resulted in extensive research into the interaction dynamics of top-quark philic DM, aiming to evaluate its visibility through direct, indirect and collider search strategies. Such efforts represent a significant advancement in our quest to resolve DM, with DM models that interact with the top quark through high-dimensional operators posited for testing at the Large Hadron Collider (LHC) and in DM search experiments [14][15][16][17]. Models employing s-channel scalar mediators [18][19][20] or gauge boson mediators [21,22] have been explored for collider implications.…”

Section: Introductionmentioning

confidence: 99%

A study on vector mediator top-philic dark matter

Hu,

Liu,

Liu

2024

Commun. Theor. Phys.

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We conducted a study on a simplified dark matter (DM) model that introduces a vector-like intermediate particle, facilitating exclusive interactions between DM and the top quark in the Standard Model (SM). The analysis focused on the relic density of Dirac-type fermion DM and highlighted the complementary role of direct detection (DD) in constraining the DM model. Notably, in instances when DM mass is small, the tree-level two-body annihilation process experiences suppression. In such scenarios, the contributions of the three-body process and the one-loop process dominate the relic abundance. Concerning DD, calculations were performed for the two-loop contribution to the DM-gluon interaction, yielding the corresponding spin-independent scattering cross-section.

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Contact interactions and top-philic scalar dark matter

Cited by 5 publications

References 56 publications

Leptoquark manoeuvres in the dark: a simultaneous solution of the dark matter problem and the $$ {R}_{D^{\left(\ast \right)}} $$ anomalies

Leptoquark manoeuvres in the dark: a simultaneous solution of the dark matter problem and the $$ {R}_{D^{\left(\ast \right)}} $$ anomalies

Phenomenological analysis of multi-pseudoscalar mediated dark matter models

A study on vector mediator top-philic dark matter

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