A Solution to the Flavor Problem of Warped Extra-Dimension Models
Abstract
A minimal solution to the flavor problem of warped extra-dimension models, i.e. the excessive mixed-chirality contribution to CP violation in K-Kbar mixing arising from Kaluza-Klein (KK) gluon exchange, is proposed. Extending the strong-interaction gauge group in the bulk by an additional SU(3), and breaking this symmetry to QCD via boundary conditions, the constraints arising from the epsilon_K parameter are significantly relaxed. As a result, KK scales M_KK ~ 2 TeV are consistent with all flavor observables without significant fine-tuning. The model predicts the existence of an extended Higgs sector featuring massive color-octet scalars and a tower of KK pseudo-axial gluon resonances, whose existence is not in conflict with recent LHC dijet bounds.
Cite
@article{arxiv.1110.0471,
title = {A Solution to the Flavor Problem of Warped Extra-Dimension Models},
author = {Martin Bauer and Raoul Malm and Matthias Neubert},
journal= {arXiv preprint arXiv:1110.0471},
year = {2015}
}
Comments
Added discussion of the extended scalar sector and its impact on the choice of boundary conditions. Corrected the Wilson coeffcients in (12) by a symmetry factor of 1/2 and updated the plots in Figure 2 with improved fitting functions. Main conclusions unchanged