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Precision Higgs measurements: constraints from new oblique corrections

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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) 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.

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Authors and Affiliations

  1. Department of physics, University of Chicago, 5720 S. Ellis Ave, Chicago, IL, U.S.A

    Stefania Gori

  2. HEP theory group of Argonne National Laboratory, South Cass Avenue, Lemont, IL, U.S.A

    Stefania Gori & Ian Low

  3. Kavli Institute for Theoretical Physics, University of California, 552 University Rd, Santa Barbara, CA, U.S.A

    Ian Low

  4. Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL, U.S.A

    Ian Low

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Gori, S., Low, I. Precision Higgs measurements: constraints from new oblique corrections. J. High Energ. Phys. 2013, 151 (2013). https://doi.org/10.1007/JHEP09(2013)151

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