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High Energy Physics - Phenomenology

arXiv:1307.0496 (hep-ph)
[Submitted on 1 Jul 2013 (v1), last revised 28 Aug 2013 (this version, v2)]

Title:Precision Higgs Measurements: Constraints from New Oblique Corrections

Authors:Stefania Gori, Ian Low
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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 1 TeV new particle, deviations in these "Higgs oblique corrections" are generically of the order of v^2/(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.
Comments: 27 pages, 6 figures, References added, Fig.4 slightly corrected, conclusions unchanged. Published in JHEP
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
Cite as: arXiv:1307.0496 [hep-ph]
  (or arXiv:1307.0496v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.1307.0496
Related DOI: https://doi.org/10.1007/JHEP09%282013%29151

Submission history

From: Stefania Gori [view email]
[v1] Mon, 1 Jul 2013 19:55:57 UTC (890 KB)
[v2] Wed, 28 Aug 2013 23:20:38 UTC (902 KB)
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