Hierarchical mass structure of fermions in warped extra dimensions

Abstract

The warped bulk standard model has been studied in the Randall-Sundrum background on S 1 /Z 2 × Z ′ 2 interval with the bulk gauge symmetryWith the assumption of no large cancellation between the fermion flavor mixing matrices, we present a simple analytic method to determine the bulk masses of standard model fermions in the almost universal bulk Yukawa coupling model. We also predict U e3 element of MNS matrix to be near the experimental upper bound when the neutrino masses are of Dirac type.

Custodial bulk Randall-Sundrum model andB→K*l+l′−

“…Nine Dirac mass parameters (c Q i , c U i , c D i ) are fairly well determined [7][8][9][10]. Assumption (2) can be easily satisfied if both U uL and U dL are CKM-type: The V CKM U y uL U dL condition is naturally satisfied without any fine-tuned cancellation.…”

Higgs boson production via vectorlike top-partner decays: Diphoton or multilepton plus multijets channels at the LHC

“…in composite Higgs models. A t 0 can also be called a top partner in the sense that it is contained in the same group representation as the top quark with respect to symmetries, like the approximate global symmetry of the little Higgs models [1][2][3], the gauge unification symmetry [22] or the custodial symmetry of RS versions with bulk matter [16][17][18][19][20][21] (explaining the SM fermion mass hierarchies [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]). …”

Testing realistic quark mass matrices in the custodial Randall-Sundrum model with flavor changing top decays

“…Subsequently, phenomenologically successful mass matrices were found in the case of one flat extra dimension without much fine tuning of the Yukawa couplings [7], and in the case of warped extra dimensions, realistic fermion masses and mixing pattern can be reproduced with almost universal bulk Yukawa couplings [8,9,10].…”