2013/07/31 by Stefania Gori, Ian Low
Engineering · Physics and Astronomy · #Black Holes and Theoretical Physics #Higgs boson #Oblique case #Particle Accelerators and Free-Electron Lasers #Particle physics #Particle physics theoretical and experimental studies #Philosophy #Physics #hep-ex #hep-ph
paper · pdf · doi:10.1007/jhep09(2013)151
27 pages, 6 figures, References added, Fig.4 slightly corrected, conclusions unchanged. Published in JHEP
arxiv created 2013/08/28 · openalex publication_date 2013/09/01 · arxiv updated 2015/06/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
New particles entering into self-energies of the Higgs boson would necessarily modify loop-induced couplings of the Higgs, if the new particle carries standard model gauge quantum numbers. For a 1 TeV new particle, deviations in these "Higgs oblique corrections" are generically of the order of v2/(1 TeV)2 ~ 5%. We study constraints on masses and couplings of new scalars and fermions that can be derived from 5-10% deviations in the Higgs digluon and diphoton partial widths. To reduce theoretical uncertainties, we present next-to-leading order QCD corrections to the Higgs-to-digluon coupling for scalars and fermions in arbitrary representations of SU(3) color group, by applying the low-energy Higgs theorems at two-loop order. As a by-product we provide a new value for NLO QCD corrections to the top squark contributions to digluon decays that differs from existing literature. We also emphasize that precise measurements of Higgs couplings to W boson and top quark are prerequisite to precise determinations of Higgs oblique corrections from new particles.