2002/04/30 by C. S. Kim, J. D. Kim, Jeonghyeon Song · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Coupling (piping) #Fermion #Gauge (firearms) #Gauge boson #Gauge theory #Geometry #Mathematical physics #Order (exchange) #Parameter space #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quark #Standard Model (mathematical formulation) #Top quark #Yukawa potential #hep-ph
paper · pdf · doi:10.1103/physrevd.67.015001
published as Phys.Rev. D67 (2003) 015001 · To satisfy the rho constraint, the model is minimally extended. The final version to appear in PRD
arxiv created 2002/11/11 · openalex publication_date 2003/01/09 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study top quark Kaluza-Klein (KK) mode mixing in the Randall-Sundrum scenario with all the SM fermions and gauge bosons in the bulk. Even though the simple assumption of a universal bulk fermion mass m_\ensuremathψ leads to the same KK mass spectrum for all SM fermions and thus suppresses new contributions to the flavor changing neutral current and the \ensuremathρ parameter, the large Yukawa coupling of the top quark generates mixing among its KK modes and breaks the degeneracy: An unacceptably large contribution to \ensuremathΔ\ensuremathρ occurs. In order to satisfy the \ensuremathΔ\ensuremathρ constraint, we relax the model by assigning a different bulk fermion mass to the SU(2) singlet bottom quark and demonstrate that there exists some limited parameter space where the \ensuremathΔ\ensuremathρ constraint is satisfied. It is also shown that the current measurement of Br(\stackrel\ensuremath→BXs+\ensuremathγ) can be accommodated in this modified model, and the one sigma level precision constrains the effective weak scale kEW such as kEW\ensuremath\gtrsim3TeV for m_\ensuremathψ/k=\ensuremath-0.4, where kEW is the warp-suppressed AdS5 curvature.