Bounds on CP-violating Higgs-gluon interactions: the case of vanishing light-quark Yukawa couplings
arXiv:1909.09373 · doi:10.1007/JHEP11(2019)117
Abstract
We investigate CP-violating interactions involving the Higgs boson and gluons within an effective field theory approach, focusing on the specific class of new-physics scenarios where the Yukawa couplings of light quarks are zero or strongly suppressed compared to the standard-model expectations. We compute the contributions of the most relevant higher-dimensional operators of Weinberg type to the electric dipole moment of the neutron (nEDM), which are induced by Feynman diagrams that involve an effective CP-violating Higgs-gluon coupling and top-quark loops. The resulting nEDM sensitivities and prospects are discussed and compared to the existing and expected LHC bounds. We find that future nEDM searches can set non-trivial constraints on CP-violating Higgs-gluon interactions even if the Higgs only couples to the third generation of quarks.
arXiv comment14 pages, 2 figures; v2: added references and discussion of bounds in universal theories; version accepted for publication in JHEP
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