Haba, Naoyuki; Oda, Kin-Ya; Takahashi, Ryo Top Yukawa deviation in extra dimension. (English) Zbl 1196.81260 Nucl. Phys., B 821, No. 1-2, 74-128 (2009); erratum ibid. 824, No. 1-2, 331-332 (2010). Summary: We suggest a simple one-Higgs-doublet model living in the bulk of five-dimensional spacetime compactified on \(S^{1}/Z_{2}\), in which the top Yukawa coupling can be smaller than the naive standard-model expectation, i.e. the top quark mass divided by the Higgs vacuum expectation value. If we find only single Higgs particle at the LHC and also observe the top Yukawa deviation, our scenario becomes a realistic candidate beyond the standard model. The Yukawa deviation comes from the fact that the wave function profile of the free physical Higgs field can become different from that of the vacuum expectation value, due to the presence of the brane-localized Higgs potentials. In the Brane-Localized Fermion scenario, we find sizable top Yukawa deviation, which could be checked at the LHC experiment, with a dominant Higgs production channel being the \(WW\) fusion. We also study the Bulk Fermion scenario with brane-localized Higgs potential, which resembles the Universal Extra Dimension model with a stable dark matter candidate. We show that both scenarios are consistent with the current electroweak precision measurements. Cited in 5 Documents MSC: 81V22 Unified quantum theories 83E15 Kaluza-Klein and other higher-dimensional theories 81T30 String and superstring theories; other extended objects (e.g., branes) in quantum field theory Keywords:top Yukawa deviation; WW fusion Software:HDECAY PDFBibTeX XMLCite \textit{N. Haba} et al., Nucl. Phys., B 821, No. 1--2, 74--128 (2009; Zbl 1196.81260) Full Text: DOI arXiv References: [1] Arkani-Hamed, N.; Dimopoulos, S.; Dvali, G. R., The hierarchy problem and new dimensions at a millimeter, Phys. Lett. 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