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

doi:10.1016/S0920-5632(03)90670-0

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

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 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 language	English
Pages (from-to)	774-777
Number of pages	4
Journal	Nuclear Physics B - Proceedings Supplements
Volume	117
Issue number	SUPPL. 1
DOIs	https://doi.org/10.1016/S0920-5632(03)90670-0
Publication status	Published - 2003 Apr

Bibliographical note

Funding Information:
∗Supported in part by Grant No. R02-2002-000-00168-0 from BRP of the KOSEF, in part by Grant No. 2001-042-D00022 of the KRF. †Supported by Grant No. 2001-042-D00022 of the KRF.

All Science Journal Classification (ASJC) codes

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

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Cite this

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abstract = "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.",

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AB - 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.

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

Abstract

Bibliographical note

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