Yukawa Corrections to Higgs Production in Top Partner Models

Abstract

Higgs production from gluon fusion is sensitive to the properties of heavy colored fermions and to the Yukawa couplings, (Y_F M_F)/v, of these particles to the Higgs boson. We compute the two--loop, $\mathcal{O}((Y_F{M}_F{)}^3/v^3)$ contributions of new high mass fermions to Higgs production. In the Standard Model, these contributions are part of the well-known electroweak corrections and are negligible. However, in models with TeV scale fermions, such as top partner or composite models, Yukawa corrections are enhanced by effects of $\mathcal{O}((Y_F{M}_F{)}^3/v^3)$ and are potentially significant due to the large mass of the new quarks. We examine the size of these top partner Yukawa corrections to Higgs production for parameter choices which are allowed by precision electroweak constraints.

27 pages, 7 figures, matches the published version

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• Distinguishing Signatures of top-and bottom-type heavy vectorlike quarks at the LHC
• Production of Singlet dominated scalar(s) at the LHC
• Unification of Gauge Couplings and the Higgs Mass in Vector-Like Particle Theories Extended into NMSSM