Results 11 to 20 of about 1,411 (170)
Muon g-2 and dark matter in models with vector-like fermions [PDF]
Proceedings of The European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2017), 2018 We investigate simplified models of new physics that can accommodate the measured value of the anomalous magnetic moment of the muon and the relic density of dark matter. We define a set of renormalizable, SU(2)$\times$U(1) invariant extensions of the Standard Model, each comprising an inert $\mathbb{Z}_2$-odd scalar field and one or more vector ...
Enrico Maria Sessolo +2 more
exaly +2 more sources
Vector-like fermions could enhance the B− mixing
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1989 Abstract The possibility of enhancing the B− b mixing without a large top mass is proposed within the context of theories which enlarge the standard model by new heavy down quarks, isosinglets under SU(2) × U(1). A model which realizes this idea is shown.
exaly +2 more sources
W boson mass and grand unification via the type-II seesaw-like mechanism
Nuclear Physics B, 2023 We propose an SU(5) GUT model extended with two additional pairs of 10 representation vector-like fermions. The CDF collaboration W boson mass anomaly is explained by using the VEV of a real SU(2)L triplet scalar coming from the 24 representation Higgs ...
Yusuke Shimizu, Shonosuke Takeshita
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Road map through the desert with scalars
Journal of High Energy Physics, 2022 In the context of the gauge coupling unification, we present a comprehensive analysis of the extensions of the Standard Model with vector-like fermions and scalars.
Ubaldo Cavazos Olivas +2 more
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A natural model of spontaneous CP violation
Journal of High Energy Physics, 2022 We examine the possibility of building a natural non-supersymmetric model of spontaneous CP violation equipped with the Nelson-Barr (NB) mechanism to address the strong CP problem.
Sudhakantha Girmohanta +3 more
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Electroweak precision constraints on vector-like fermions [PDF]
The European Physical Journal C, 2008 We calculate the oblique electroweak corrections and confront with the experiments in an extension of the Standard Model. The new fields added are a vector-like weak doublet and a singlet fermion. After electroweak symmetry breaking there is a mixing between the components of the new fields, but no mixing allowed with the standard fermions.
Cynolter, G, Lendvai, E
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Simplified models of vector SU(4) leptoquarks at the TeV
European Physical Journal C: Particles and Fields, 2022 Assuming confirmation of the anomalies in semi-leptonic B-decays, their explanation in terms of the exchange of a massive vector leptoquark field, $$U_{\mu }^a$$ U μ a , of charge 2/3, appears to require the inclusion of $$U_{\mu }^a$$ U μ a in the ...
Riccardo Barbieri +2 more
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Vector-like fermion contributions to ε′ [PDF]
Nuclear Physics B, 1986 We consider extensions to the standard electroweak model which contain new vector-like fermions at the Fermi scale as a source of CP violation. After a detailed calculation of the QCD corrections to leading order, we find that the new contributions to |e′/e| range typically from 10 −3 to 10 −2 when we require that the corresponding contributions to
F. Del Aguila, M.K. Chase, J. Cortes
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Leptonic cascade decays of a heavy Higgs boson through vectorlike leptons at the LHC
Journal of High Energy Physics, 2022 We demonstrate the potential of fully leptonic cascade decays of a heavy neutral Higgs boson through vectorlike leptons as a simultaneous probe for extended Higgs sectors and extra matter particles at the LHC.
Radovan Dermisek +4 more
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Probing an MeV-scale scalar boson in association with a TeV-Scale top-quark partner at the LHC
Journal of High Energy Physics, 2023 Searches for new low-mass matter and mediator particles have actively been pursued at fixed target experiments and at e + e − colliders. It is challenging at the CERN LHC, but they have been searched for in Higgs boson decays and in B meson decays by the
Bhaskar Dutta +5 more
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