Kingman Cheung, Jae Sik Lee, Po-Yan Tseng
After the discovery of the Higgs boson at the LHC, it is natural to start the research program on the precision study of the Higgs-boson couplings to various standard model (SM) particles. We provide a generic framework for the deviations of the couplings from their SM values by introducing a number of parameters. We show that a large number of models beyond the SM can be covered, including two-Higgs-doublet models, supersymmetric models, little-Higgs models, extended Higgs sectors with singlets, and fourth generation models. We perform global fits to the most updated data from CMS, ATLAS, and Tevatron under various initial conditions of the parameter set. Highlights of the results include: (i) the nonstandard decay branching ratio of the Higgs boson is less than 25%; (ii) the most efficient way to achieve the best fit is to introduce additional particle contributions to the triangular-loop functions of H-gamma-gamma and Hgg vertices; (iii) the 1 sigma allowed range of the relative coupling of HVV is 0.96 +0.13 -0.15, which means that the electroweak-symmetry breaking contribution from the observed Higgs boson leaves only a small room for other Higgs bosons; and (iv) the current data do not rule out pseudoscalar couplings nor pseudoscalar contributions to the H-gamma-gamma and Hgg vertices.
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http://arxiv.org/abs/1302.3794
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