TY - JOUR
T1 - Precision Higgs measurements
T2 - Constraints from new oblique corrections
AU - Gori, Stefania
AU - Low, Ian
PY - 2013/9
Y1 - 2013/9
N2 - 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.
AB - 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.
KW - Beyond standard model
KW - Higgs physics
KW - Supersymmetric standard model
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U2 - 10.1007/JHEP09(2013)151
DO - 10.1007/JHEP09(2013)151
M3 - Article
AN - SCOPUS:84901418868
SN - 1126-6708
VL - 2013
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 9
M1 - 151
ER -