Top quark Kaluza-Klein mode mixing in the Randall-Sundrum bulk Standard Model and constraint from Δρ

C. S. Kim, J. D. Kim, J. Song

Research output: Contribution to journalArticle


The Randall-Sundrum (RS) scenario with all the standard model (SM) fermions and gauge bosons in the bulk is phenomenologically studied. Even though the simple assumption of universal bulk fermion mass mψ leads to the same Kaluza-Klein (KK) mass spectrum for all the SM fermions and thus suppresses new contributions to Flavor-Changing-Neutral-Current (FCNC) and the ρ parameter, large Yukawa coupling of the top quark generates its KK mode mixing and breaks the degeneracy: unacceptably large contribution to Δρ occurs. With a different bulk fermion mass to SU(2) singlet bottom quark, we demonstrate that there exists some parameter space to satisfy the Δρ constraint.

Original languageEnglish
Pages (from-to)774-777
Number of pages4
JournalNuclear Physics B - Proceedings Supplements
Issue numberSUPPL. 1
Publication statusPublished - 2003 Apr


All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics

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