Top quark Kaluza-Klein mode mixing in the Randall-Sundrum bulk standard model and constraint from Δϱ
✍ Scribed by C.S. Kim; J.D. Kim; J. Song
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 534 KB
- Volume
- 117
- Category
- Article
- ISSN
- 0920-5632
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✦ Synopsis
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 m ψ 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 ∆ρ occurs. With a different bulk fermion mass to SU(2) singlet bottom quark, we demonstrate that there exists some parameter space to satisfy the ∆ρ constraint.