Detector-size upper bounds on dark hadron lifetime from cosmology

Li, Lingfeng; Tsai, Yuhsin

doi:10.1007/jhep05(2019)072

Cited by 12 publications

(8 citation statements)

References 71 publications

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“…The main process that keeps dark pions in thermal equilibrium with the dark rhos (and hence with the SM) is the pair annihilation ππ → ρρ. This process is fully efficient as long as the temperature is large compared to m ρ −m π , but becomes exponentially suppressed for smaller temperatures [15,20,40]. Provided that the dark ρ mesons are always in thermal equilibrium with the SM, the Boltzmann equation for the dark pion number density n π reads ṅπ…”

Section: Relic Density From Forbidden Annihilationsmentioning

confidence: 99%

Strongly interacting dark sectors in the early Universe and at the LHC through a simplified portal

Bernreuther

Kahlhoefer

Krämer

et al. 2020

J. High Energ. Phys.

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We study the cosmology and LHC phenomenology of a consistent strongly interacting dark sector coupled to Standard Model particles through a generic vector mediator. We lay out the requirements for the model to be cosmologically viable, identify annihilations into dark vector mesons as the dominant dark matter freeze-out process and discuss bounds from direct detection. At the LHC the model predicts dark showers, which can give rise to semi-visible jets or displaced vertices. Existing searches for di-jet resonances and for missing energy mostly probe the parameter regions where prompt decays are expected and constrain our model despite not being optimised for dark showers. We also estimate the sensitivity of dedicated analyses for semi-visible jets and emphasize the complementarity of different search strategies.

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Section: Relic Density From Forbidden Annihilationsmentioning

confidence: 99%

Strongly interacting dark sectors in the early Universe and at the LHC through a simplified portal

Bernreuther

Kahlhoefer

Krämer

et al. 2020

J. High Energ. Phys.

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show abstract

“…Below the scale Λ d , the dark sector confines, which leads to the formation of dark mesons. In particular, this confinement gives rise to three dark pions π 0 d , π + d , π − d , with the U (1) charges 0, +2 and −2, which are stable DM candidates and can arrive at the correct DM relic abundance via Boltzmann-suppressed annihilations into slightly heavier dark mesons [44,45]. These other dark meson species are generically unstable [28].…”

Section: Strongly Interacting Dark Sectormentioning

confidence: 99%

Forecasting dark showers at Belle II

Bernreuther¹,

Böse²,

Hearty³

et al. 2022

Preprint

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Dark showers from strongly interacting dark sectors that confine at the GeV scale can give rise to novel signatures at e + e − colliders. In this work, we study the sensitivity of B factory experiments to dark showers produced through an effective interaction arising from a heavy off-shell mediator. We show that a prospective search for displaced vertices from GeV-scale long-lived particles at Belle II can improve the sensitivity to dark showers substantially compared to an existing search at BaBar. We compare the sensitivity of searches for displaced signals to searches for promptly produced resonances at BaBar and KLOE and calculate sensitivity projections for a single-photon search at Belle II to invisible dark showers produced through an effective interaction. The underlying structure of the effective interaction can be resolved at higher-energy experiments, where the mediator can be produced on-shell. To study the resulting constraints, we update electroweak precision bounds on kinetically mixed Z bosons and reinterpret a search for low-mass di-muon resonances at LHCb in terms of dark showers. We find that LHCb and Belle II are most sensitive to different particle decay lengths, underscoring the complementarity of LHC and intensity frontier experiments.

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“…Finally, the standard signatures of the FTH scenario are present in the Z 2 scenario as well, including exotic Higgs decays into twin fermions and glueballs which give rise to long-lived particle signatures [18,42,[84][85][86][87][88][89][90], the production of new SM singlet scalar states [88,[91][92][93], and possible signals of the UV completion (see e.g. [94]).…”

Section: Experimental Signaturesmentioning

confidence: 99%

Resurrecting the Fraternal Twin WIMP Miracle

Curtin,

Gryba,

Hooper

et al. 2021

Preprint

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In Twin Higgs models which contain the minimal particle content required to address the little hierarchy problem (i.e. fraternal models), the twin tau has been identified as a promising candidate for dark matter. In this class of scenarios, however, the elastic scattering cross section of the twin tau with nuclei exceeds the bounds from XENON1T and other recent direct detection experiments. In this paper, we propose a modification to the Fraternal Twin Higgs scenario that we call Z2FTH, incorporating visible and twin hypercharged scalars (with Y = 2) which break twin electromagnetism. This leads to new mass terms for the twin tau that are unrelated to its Yukawa coupling, as well as additional annihilation channels via the massive twin photon. We show that these features make it possible for the right-handed twin tau to freeze out with an acceptable thermal relic abundance while scattering with nuclei at a rate that is well below existing constraints. Nonetheless, large portions of the currently viable parameter space in this model are within the reach of planned direct detection experiments. The prospects for indirect detection using gamma rays and cosmic-ray antiprotons are also promising in this model. Furthermore, if the twin neutrino is light, the predicted deviation of ∆N eff ≈ 0.1 would be within reach of Stage 4 CMB experiments. Finally, the high luminosity LHC should be able to probe the entire parameter space of the Z2FTH model through charged scalar searches. We also discuss how searches for long-lived particles are starting to constrain Fraternal Twin Higgs models.

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Detector-size upper bounds on dark hadron lifetime from cosmology

Cited by 12 publications

References 71 publications

Strongly interacting dark sectors in the early Universe and at the LHC through a simplified portal

Strongly interacting dark sectors in the early Universe and at the LHC through a simplified portal

Forecasting dark showers at Belle II

Resurrecting the Fraternal Twin WIMP Miracle

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