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Results for “extensions of fermion sector”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Self-interacting neutrinos: Solution to Hubble tension versus experimental constraints
Exotic self-interactions among the Standard-Model neutrinos have been proposed as a potential reason behind the tension in the expansion rate, H 0 , of the universe inferred from different observations. We constrain this proposal using electroweak precision observables, rare meson decays, and neutrinoless double-β decay. In contrast to previous works, we emphasize the importance of carrying out this study in a framework with full Standard-Model gauge invariance. We implement this first by working with a relevant set of Standard- Model-Effective-Field-Theory operators and subsequently by considering a UV completion in the inverse See-Saw model. We find that the scenario in which all flavors of neutrinos self-interact universally is strongly constrained, disfavoring a potential solution to the H 0 problem in this case. The scenario with self-interactions only among tau neutrinos is the least constrained and can potentially be consistent with a solution to the H 0 problem.
Searching for exotic production of Higgs boson + X to map out new physics
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Z -boson decays into Majorana or Dirac heavy neutrinos
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Constraints on decaying sterile neutrinos from solar antineutrinos
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Low-scale resonant leptogenesis in S U ( 5 ) GUT with T 13 family symmetry
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Impact of dimension-eight SMEFT contributions: A case study
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No-lose theorem for discovering the new physics of ( g − 2 ) μ at muon colliders
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Future searches for light sterile neutrinos at nuclear reactors
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Discovering heavy neutrino oscillations in rare B c ± meson decays at HL-LHCb
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Constraining low-scale flavor models with ( g − 2 ) μ and lepton flavor violation
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Gauge hierarchy from electroweak vacuum metastability
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Heavy neutral leptons below the kaon mass at hodoscopic neutrino detectors
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Accommodating the CDF W -boson mass measurement in the beautiful mirror model
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Isosinglet vectorlike leptons at $e$ + $e$ – colliders
We study weak isosinglet vectorlike leptons that decay through a small mixing with the tau lepton, for which the discovery and exclusion reaches of the Large Hadron Collider and future proposed hadron colliders are limited. We show how an $e$ + $e$ – collider may act as a discovery machine for these τ' particles, demonstrate that the τ' mass peak can be reconstructed in a variety of distinct signal regions, and explain how the τ' branching ratios may be measured.
Search for production of a single vectorlike quark decaying to t H or t Z in the all-hadronic final state in p p collisions at s = 13 TeV
A search for electroweak production of a single vectorlike T quark in association with a bottom ( b ) quark in the all-hadronic decay channel is presented. This search uses proton-proton collision data at s = 13 TeV collected by the CMS experiment at the CERN LHC during 2016–2018, corresponding to an integrated luminosity of 138 fb - 1 . The T quark is assumed to have charge 2 / 3 and decay to a top ( t ) quark and a Higgs ( H ) or Z boson. Hadronic decays of the t quark and the H or Z boson are reconstructed from the kinematic properties of jets, including those containing b hadrons. No deviation from the standard model prediction is observed in the reconstructed t H and t Z invariant mass distributions. The 95% confidence level upper limits on the product of the production cross section and branching fraction of a T quark produced in association with a b quark and decaying via t H or t Z range from 1260 to 68 fb for T quark masses of 600–1200 GeV.