Flavour Changing Neutral Current Constraints from Kaluza-Klein Gluons and Quark Mass Matrices in RS1

Abstract

We continue our previous study on what are the allowed forms of quark mass matrices in the Randall-Sundrum (RS) framework that can reproduce the experimentally observed quark mass spectrum and the CKM mixing pattern. We study the constraints the $\Delta F=2$ processes in the neutral meson sector placed on the admissible forms found there, and we found only the asymmetrical type of quark mass matrices arising from anarchical Yukawa structures stay viable at the few TeV scale reachable at the LHC. We study also the decay of the first Kaluza-Klein (KK) excitation of the gluon. We give the decay branching ratios into quark pairs, and we point out that measurements of the decay width and just one of the quark spins in the dominant $\bar{t}t$ decays can be used to extract the effective coupling of the first KK gluon to top quarks for both chiralities. This provides further probe to the flavour structure of the RS framework.

v2: 23 pages, 1 figure. Typos corrected, references added. Discussions in Sec. III extended with clarifications, Additional appendix added

References in corpus (10)

• A custodial symmetry for Zbb
• Updated Values of Running Quark and Lepton Masses
• The Flavor of the Composite Pseudo-Goldstone Higgs
• Flavor Physics in the Randall-Sundrum Model: I. Theoretical Setup and Electroweak Precision Tests
• The Bulk RS KK-gluon at the LHC
• Gauge-Higgs Unification and Radiative Electroweak Symmetry Breaking in Warped Extra Dimensions
• Probing New Physics through B Mixing: Status, Benchmarks and Prospects
• Minimal Flavor Protection: A New Flavor Paradigm in Warped Models
• Kaluza-Klein Gluons as a Diagnostic of Warped Models
• Testing Realistic Quark Mass Matrices in the Custodial Randall-Sundrum Model with Flavor Changing Top Decays

Cited by in corpus (2)

• Flavor Violation Tests of Warped/Composite SM in the Two-Site Approach
• LHC Signals for Warped Electroweak Charged Gauge Bosons