A tale of two portals: testing light, hidden new physics at future e
                            +
                            e
                            − colliders

Liu, Jia; Wang, Xiaoping; Yu, Felix

doi:10.1007/jhep06(2017)077

Cited by 30 publications

(13 citation statements)

References 78 publications

(111 reference statements)

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“…Finally, Ref. [34] evaluated the prospects for discovering A and h D via Higgs-strahlung at future lepton colliders, where they focused on decays to invisible hidden-sector states.…”

Section: Introductionmentioning

confidence: 99%

Rare Z boson decays to a hidden sector

2018

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We demonstrate that rare decays of the Standard Model Z boson can be used to discover and characterize the nature of new hidden-sector particles. We propose new searches for these particles in soft, highmultiplicity leptonic final states at the Large Hadron Collider. The proposed searches are sensitive to lowmass particles produced in Z decays, and we argue that these striking signatures can shed light on the hidden-sector couplings and mechanism for mass generation.

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“…Finally, Ref. [34] evaluated the prospects for discovering A and h D via Higgs-strahlung at future lepton colliders, where they focused on decays to invisible hidden-sector states.…”

Section: Introductionmentioning

confidence: 99%

Rare Z boson decays to a hidden sector

2018

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“…As compared to previous studies with the estimated mass resolution ∆m µ + µ − = m 2 A /(10 5 GeV) [25] at √ s = 90 GeV and 250 GeV or the mass window cut ∆m µ + µ − < 5 GeV [24] at √ s = 250 GeV and 500 GeV, our study with a detailed detector simulation and a realistic muon momentum resolution shows that a mass window cut ∆m µ + µ − < 0.5 GeV ∼ 1.5 GeV is appropriate for the dark photon searches in e + e − → γA → γµ + µ − at future e + e − colliders with √ s = 160 GeV, 240 (250) GeV and 350 GeV. Consequently, our results are optimized and more realistic.…”

Section: Jhep03(2018)139mentioning

confidence: 73%

Search for a heavy dark photon at future e+e− colliders

Huang

et al. 2018

J. High Energ. Phys.

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A coupling of a dark photon A from a U(1) A with the standard model (SM) particles can be generated through kinetic mixing represented by a parameter . A non-zero also induces a mixing between A and Z if dark photon mass m A is not zero. This mixing can be large when m A is close to m Z even if the parameter is small. Many efforts have been made to constrain the parameter for a low dark photon mass m A compared with the Z boson mass m Z . We study the search for dark photon in e + e − → γA → γµ + µ − for a dark photon mass m A as large as kinematically allowed at future e + e − colliders. For large m A , care should be taken to properly treat possible large mixing between A and Z. We obtain sensitivities to the parameter for a wide range of dark photon mass at planed e + e − colliders, such as Circular Electron Positron Collider (CEPC), International Linear Collider (ILC) and Future Circular Collider (FCC-ee). For the dark photon mass 20 GeV m A 330 GeV, the 2σ exclusion limits on the mixing parameter are 10 −3 -10 −2 . The CEPC with √ s = 240 GeV and FCC-ee with √ s = 160 GeV are more sensitive than the constraint from current LHCb measurement once the dark photon mass m A 50 GeV. For m A 220 GeV, the sensitivity at the FCC-ee with √ s = 350 GeV and 1.5 ab −1 is better than that at the 13 TeV LHC with 300 fb −1 , while the sensitivity at the CEPC with √ s = 240 GeV and 5 ab −1 can be even better than that at 13 TeV LHC with 3 ab −1 for m A 180 GeV. We also comment on sensitivities of e + e − → γA with dark photon decay into several other channels at future e + e − colliders.

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“…IV. The low Z mass region is therefore challenging to probe via dark matter searches in this case; however, such a Z could be probed at a future e+ e− collider [41].…”

Section: Limits On the Parameter Spacementioning

confidence: 99%

Right-handed neutrino dark matter in a U(1) extension of the Standard Model

Cox

Han

Yanagida

2018

J. Cosmol. Astropart. Phys.

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We consider minimal U (1) extensions of the Standard Model in which one of the right-handed neutrinos is charged under the new gauge symmetry and plays the role of dark matter. In particular, we perform a detailed phenomenological study for the case of a U (1) (B−L) 3 flavoured B−L symmetry. If perturbativity is required up to high-scales, we find an upper bound on the dark matter mass of mχ 2 TeV, significantly stronger than that obtained in simplified models. Furthermore, if the U (1) (B−L) 3 breaking scalar has significant mixing with the SM Higgs, there are already strong constraints from direct detection. On the other hand, there remains significant viable parameter space in the case of small mixing, which may be probed in the future via LHC Z searches and indirect detection. We also comment on more general anomaly-free symmetries consistent with a TeV-scale RH neutrino dark matter candidate, and show that if two heavy RH neutrinos for leptogenesis are also required, one is naturally led to a single-parameter class of U (1) symmetries.

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A tale of two portals: testing light, hidden new physics at future e + e − colliders

Cited by 30 publications

References 78 publications

Rare Z boson decays to a hidden sector

Rare Z boson decays to a hidden sector

Search for a heavy dark photon at future e+e− colliders

Right-handed neutrino dark matter in a U(1) extension of the Standard Model

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