2008/06/30 by W. L. Chang, We-Fu Chang, John N. Ng +1
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.78.096003
published as Phys.Rev.D78:096003,2008 · 30 pages, 6 figures. Reference added, typos corrected, discussions in Sec. IV B expanded. Version conforms to the published version
openalex publication_date 2008/11/04 · arxiv created 2008/11/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study quark mass matrices in the Randall-Sundrum (RS) model with bulk symmetry SU(2)L\ifmmode×\else\texttimes\fiSU(2)R\ifmmode×\else\texttimes\fiU(1)_B\ensuremath-L. The Yukawa couplings are assumed to be within an order of magnitude of each other, and perturbative. We find that quark mass matrices of the symmetrical form proposed by Koide et al. [Y. Koide, H. Nishiura, K. Matsuda, T. Kikuchi, and T. Fukuyama, Phys. Rev. D 66, 093006 (2002)] can be accommodated in the RS framework with the assumption of hierarchyless Yukawa couplings, but not the Hermitian Fritzsch-type mass matrices. General asymmetrical mass matrices are also found which fit well simultaneously with the quark masses and the Cabibbo-Kobayashi-Maskawa matrix. Both left-handed (LH) and right-handed (RH) quark rotation matrices are obtained that allow analysis of flavor changing decay of both LH and RH top quarks. At a warped down scale of 1.65 TeV, the total branching ratio of t\ensuremath→Z+jets can be as high as \ensuremath∼5\ifmmode×\else\texttimes\fi10^\ensuremath-6 for symmetrical mass matrices and \ensuremath∼2\ifmmode×\else\texttimes\fi10^\ensuremath-5 for asymmetrical ones. This level of signal is within reach of the LHC.