Results 11 to 20 of about 1,339 (163)
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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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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Baryogenesis and dark matter with vector-like fermions [PDF]
Journal of High Energy Physics, 2013 We show that vector-like fermions can act as the dark matter candidate in the universe whilst also playing a crucial role in electroweak baryogenesis through contributing to the barrier in the one-loop thermal scalar potential. In order for the new fermions to give rise to a strong first order phase transition, we show that one requires rather large ...
Fairbairn, M., Grothaus, P.
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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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Parity realization in vector-like theories from fermion bilinears [PDF]
Journal of High Energy Physics, 2008 12 pages, no figures To be published in ...
Azcoiti, V., di Carlo, G., Vaquero, A.
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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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ΔF=2 effective Lagrangian in theories with vector-like fermions [PDF]
Physics Letters B, 1998 In this work we analyze a new piece present in the $ F = 2$ effective Lagrangian in models with extra vector-like quarks. This piece, which was not taken into account previously, is required in order to preserve gauge invariance once the unitarity of the CKM matrix is lost.
Barenboim Szuchman, Gabriela Alejandra +1 more
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Wilson coefficients and natural zeros from the on-shell viewpoint
Journal of High Energy Physics, 2022 We show how to simplify the calculation of the finite contributions from heavy particles to EFT Wilson coefficients by using on-shell methods. We apply the technique to the one-loop calculation of g − 2 and Hγγ, showing how finite contributions can be ...
Luigi Delle Rose +2 more
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Higgs vacuum stability with vectorlike fermions [PDF]
Physical Review D, 2019 We present the effects of vector-like fermions (VLF) on the stability of the Higgs electroweak vacuum, using the renormalization group improved Higgs effective potential. We review the calculation of the one-loop beta-functions of the standard model couplings, paying particular attention to the fermion contributions.
Gopalakrishna, Shrihari +1 more
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