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Flavor Physics in the Randall-Sundrum Model: I. Theoretical Setup and Electroweak Precision Tests | | S. Casagrande
; F. Goertz
; U. Haisch
; M. Neubert
; T. Pfoh
; | | Date: |
31 Jul 2008 | | Abstract: | A complete discussion of tree-level flavor-changing effects in the
Randall-Sundrum (RS) model with brane-localized Higgs sector and bulk gauge and
matter fields is presented. The bulk equations of motion for the gauge and
fermion fields, supplemented by boundary conditions taking into account the
couplings to the Higgs sector, are solved exactly, including the mixing between
different generations in a completely general way. The hierarchies observed in
the fermion spectrum and the quark mixing matrix are explained naturally in
terms of anarchic five-dimensional Yukawa matrices and wave-function overlap
integrals. Detailed studies of the flavor-changing couplings of the Higgs boson
and of gauge bosons and their KK excitations are performed, including in
particular the couplings of the standard W and Z bosons. A careful analysis of
electroweak precision observables including the S and T parameters and the Zbb
couplings shows that the simplest RS model containing only Standard Model
particles and their KK excitations is consistent with all experimental bounds
for a KK scale as low as a few TeV, if one allows for a heavy Higgs boson
and/or for an ultra-violet cutoff below the Planck scale. The study of
flavor-changing effects includes analyses of the non-unitarity of the quark
mixing matrix, anomalous right-handed couplings of the W bosons, tree-level
flavor-changing neutral current couplings of the Z and Higgs bosons, the rare
decays t->c(u)+Z and t->c(u)+h, and the flavor mixing among KK fermions. The
results obtained in this work form the basis for general calculations of
flavor-changing processes in the RS model and its extensions. | | Source: | arXiv, 0807.4937 | | Services: | Forum | Review | PDF | Favorites | |
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