Searching for confining hidden valleys at LHCb, ATLAS, and CMS

Pierce, Aaron; Shakya, Bibhushan; Tsai, Yuhsin; Zhao, Yue

doi:10.1103/physrevd.97.095033

Cited by 68 publications

(87 citation statements)

References 43 publications

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“…Searches for dark showers can be complemented by searching for decays of individual dark pions decaying in the LHC detectors, in particular at LHCb with its low trigger thresholds and accurate particle reconstruction. Some work in this direction has recently been published [71,72], and we expect that similar studies can also constrain our flavoured dark sector scenario.…”

Section: Summary Of Constraints and Conclusionmentioning

confidence: 57%

A flavoured dark sector

Renner

Schwaller

2018

J. High Energ. Phys.

100

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Abstract:We explore the phenomenology of a QCD-like dark sector which confines around the GeV scale. The dark sector inherits a flavour structure from a coupling between dark quarks and SM quarks via a heavy mediator, which leads to exciting new phenomena. While stable baryonic bound states are the dark matter candidates, the phenomenology is dominated by the lightest composite mesons, the dark pions, which can have decay lengths ranging from millimetres to hundreds of meters. For masses below 1.5 GeV, their exclusive decays to SM mesons are calculated for the first time by matching both dark and visible sectors to a chiral Lagrangian. Constraints from big bang nucleosynthesis, dark matter direct detection and flavour single out a small region of allowed parameter space for dark pion masses below 5 GeV. It is best probed by the fixed target experiments NA62 and SHiP, where dark pions can be produced copiously in rare decays like B → Kπ D . The dominant π D → K ± π ∓ and π D → 3π decay modes are a smoking gun for a CP-odd, flavour violating new resonance. Heavier dark pions are best searched for at the LHC, where they decay after hadronisation to produce jets which emerge into SM states within the detector. Here the flavour structure ensures different flavours emerge on different length scales, leading to a striking new feature in the emerging jets signature.

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Section: Summary Of Constraints and Conclusionmentioning

confidence: 57%

A flavoured dark sector

Renner

Schwaller

2018

J. High Energ. Phys.

100

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“…Furthermore, it has been shown that the detector's vertexing and invariant mass resolution as well as its ability for particle identification makes it an excellent instrument to search for displaced muon pairs from, e.g., displaced visible decays of dark photons [44,45]. Similar searches are also sensitive to soft energy deposition from the showering and hadronization in confining hidden sectors [46,47].…”

Section: B Displaced Muons At Lhcbmentioning

confidence: 99%

Inelastic dark matter at the LHC lifetime frontier: ATLAS, CMS, LHCb, CODEX-b, FASER, and MATHUSLA

2019

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Visible signals from the decays of light long-lived hidden sector particles have been extensively searched for at beam dump, fixed-target, and collider experiments. If such hidden sectors couple to the Standard Model through mediators heavier than ∼ 10 GeV, their production at low-energy accelerators is kinematically suppressed, leaving open significant pockets of viable parameter space. We investigate this scenario in models of inelastic dark matter, which give rise to visible signals at various existing and proposed LHC experiments, such as ATLAS, CMS, LHCb, CODEX-b, FASER, and MATHUSLA. These experiments can leverage the large center of mass energy of the LHC to produce GeV-scale dark matter from the decays of dark photons in the cosmologically motivated mass range of ∼ 1 − 100 GeV. We also provide a detailed calculation of the radiative dark matternucleon/electron elastic scattering cross section, which is relevant for estimating rates at direct detection experiments.

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“…Relatively weak interactions are sufficient for the ρ 0 decays to proceed sufficiently fast to keep the dark sector in thermal equilibrium with the SM during freeze-out, while somewhat stronger interactions allow for the dark sector to be probed with direct detection experiments and at the LHC. Rho mesons that decay promptly on collider scales as well as long-lived mesons are a generic possibility of these models, leading to a wide range of novel collider signatures, such as semi-visible jets [21][22][23] and emerging jets [16,24].…”

Section: Introductionmentioning

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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Searching for confining hidden valleys at LHCb, ATLAS, and CMS

Cited by 68 publications

References 43 publications

A flavoured dark sector

A flavoured dark sector

Inelastic dark matter at the LHC lifetime frontier: ATLAS, CMS, LHCb, CODEX-b, FASER, and MATHUSLA

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

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