Top Yukawa Deviation in Extra Dimension

Abstract

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.

61 pages, 19 figures, typos corrected, comments added, published version

References in corpus (4)

• Dark Matter and Collider Phenomenology of Universal Extra Dimensions
• Precision electroweak constraints on Universal Extra Dimensions revisited
• Non-minimal universal extra dimensions
• Improved Measurement of the Positive Muon Lifetime and Determination of the Fermi Constant

Cited by in corpus (17)

• Universal extra dimensions after Higgs discovery
• A4 Flavor Models in Split Seesaw Mechanism
• Non-minimal Universal Extra Dimensions: The strongly interacting sector at the Large Hadron Collider
• $CP$ phase from twisted Higgs vacuum expectation value in extra dimension
• 5D UED: Flat and Flavorless
• Realization of lepton masses and mixing angles from point interactions in an extra dimension
• 6d Dirac fermion on a rectangle; scrutinizing boundary conditions, mode functions and spectrum
• Unitarity in Dirichlet Higgs Model
• Higgs production and decay processes via loop diagrams in various 6D Universal Extra Dimension Models at LHC
• Dirichlet Higgs as radion stabilizer in warped compactification
• GIMPs from Extra Dimensions
• Unitarity Constraints on non-minimal Universal Extra Dimensional Model
• Separate seesaw and its applications to dark matter and baryogenesis
• Notes on sphere-based universal extra dimensions
• Phenomenological Aspects of Dirichlet Higgs Model from Extra-Dimension
• Diagonal Kaluza-Klein expansion under brane localized potential
• Spontaneous CP violation, sterile neutrino dark matter, and leptogenesis