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Massive Doublet Leptons
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Massive vector-like electroweak doublets are generic in many extensions of the standard model. Even though one member of the doublet is necessarily electrically charged these particles are not easily detected in collider experiments. The neutral and charged states within the doublet are split by electroweak symmetry breaking. In the absence of mixing with other states, the radiatively generated splitting is in the range 200 - 350 MeV for m > mZ/2. The charged state decays to the neutral one with an O(cm) decay length, predominantly by emission of a soft charged pion. The best possibility to detect these massive charged particles is to trigger on hard initial state radiation and search for two associated soft charged pions with displaced vertices. The mass reach for this process at LEPII is limited by luminosity rather than kinematics.
Forward citations
Cited by 11 Pith papers
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Singlet-Doublet fermion origin of dark matter, neutrino mass and inverse first-order electroweak phase transition
New singlet and doublet fermions, a scalar singlet, and right-handed neutrinos can simultaneously explain Dirac neutrino masses, dark matter, and a two-step inverse electroweak phase transition with observable gravita...
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Singlet-doublet dark matter beyond freeze-out
In the small-coupling limit of the singlet-doublet dark matter model, the relic density is set by co-scattering, freeze-in, or SuperWIMP decays rather than ordinary freeze-out, and the observable signals move from dir...
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Search for long-lived charginos and $\tau$-sleptons using final states with a disappearing track in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
No excess found in 137 fb^-1 of 13 TeV pp data; new 95% CL exclusions reach chargino masses up to 880 GeV and tau-sleptons up to 320 GeV at ~1 ns lifetimes.
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Minimal Freeze-in Dark Matter: Reviving electroweak doublet dark matter with Boltzmann suppressed freeze-in
Electroweak SU(2)_L doublet fermion dark matter with mass above 10^10 GeV (or 300 GeV if pseudo-Dirac) is produced by Boltzmann-suppressed freeze-in above the reheat temperature and evades direct detection while never...
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Exploring Fermionic Dark Matter in the Presence of Scalar Leptoquarks
A vector-like lepton dark matter model with two inert scalar leptoquarks produces a radiative pseudo-Dirac mass splitting that evades direct detection and opens up parameter space for the correct relic density.
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Probing Dark Matter freeze-in with long-lived particle signatures: MATHUSLA, HL-LHC and FCC-hh
Projected MATHUSLA, HL-LHC, and FCC-hh forward detector sensitivities probe Higgs-mediated freeze-in dark matter across parent masses up to about 10 TeV.
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Complementary Probes of Light Higgsinos: Electroweak Precision Measurements and Dark Matter Direct Detection
Future electroweak precision measurements can probe light higgsinos up to 500 GeV even in compressed spectra below the neutrino fog, complementing direct detection which reaches the 1 TeV thermal relic mass.
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Singlet-doublet dark matter revisited
The singlet-doublet dark matter model now passes direct detection limits only with small Yukawa couplings or near blind spots, with coannihilation and a compressed spectrum needed to match the observed relic density.
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Exploring two component doublet dark matter
A two-component model with an inert scalar doublet and a pseudo-Dirac fermion doublet can match Planck relic density and direct and indirect limits in sub-TeV mass regions, and a type-II seesaw triplet can also genera...
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The curtain lowers on directly detectable higgsino dark matter
Using LZ2024 limits, the paper derives new lower bounds on gaugino masses and upper bounds on higgsino mass splittings in decoupled-MSSM higgsino dark matter scenarios, plus projections for the neutrino fog.
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Prospects for probing neutral vector-like leptons via pair production at muon collider
Simulations indicate a 6 TeV muon collider with 4 ab^{-1} can reach >5σ significance for neutral doublet VLLs of 1.3-3 TeV mass using 4j2μ and 2ℓ2μ + missing energy channels under polarized beams.
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