Precision Higgs measurements: Constraints from new oblique corrections

Stefania Gori, Ian Low

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

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 1TeV new particle, deviations in these "Higgs oblique corrections" are generically of the order of υ2 =(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)c 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.

Original languageEnglish (US)
Article number151
JournalJournal of High Energy Physics
Volume2013
Issue number9
DOIs
StatePublished - Sep 2013

Keywords

  • Beyond standard model
  • Higgs physics
  • Supersymmetric standard model

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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