Top Yukawa Deviation in Extra Dimension - High Energy Physics - PhenomenologyReport as inadecuate

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Abstract: We suggest a simple one-Higgs-doublet model living in the bulk offive-dimensional spacetime compactified on $S^1-Z 2$, in which the top Yukawacoupling can be smaller than the naive standard-model expectation, i.e. the topquark mass divided by the Higgs vacuum expectation value. If we find onlysingle Higgs particle at the LHC and also observe the top Yukawa deviation, ourscenario becomes a realistic candidate beyond the standard model. The Yukawadeviation comes from the fact that the wave function profile of the freephysical Higgs field can become different from that of the vacuum expectationvalue, due to the presence of the brane-localized Higgs potentials. In theBrane-Localized Fermion scenario, we find sizable top Yukawa deviation, whichcould be checked at the LHC experiment, with a dominant Higgs productionchannel being the $WW$ fusion. We also study the Bulk Fermion scenario withbrane-localized Higgs potential, which resembles the Universal Extra Dimensionmodel with a stable dark matter candidate. We show that both scenarios areconsistent with the current electroweak precision measurements.

Author: Naoyuki Haba, Kin-ya Oda, Ryo Takahashi


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