6533b831fe1ef96bd129991f

RESEARCH PRODUCT

Solution to the Flavor Problem of Warped Extra-Dimension Models

Raoul MalmMartin BauerMatthias Neubert

subject

Quantum chromodynamicsPhysicsParticle physicsHigh Energy Physics::LatticeHigh Energy Physics::PhenomenologyFOS: Physical sciencesGeneral Physics and AstronomyObservableSymmetry (physics)Higgs sectorGluonHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Gauge groupCP violationHigh Energy Physics::ExperimentBoundary value problem

description

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.

yearjournalcountryeditionlanguage
2011-10-03Physical Review Letters
https://doi.org/10.1103/physrevlett.108.081603