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

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• Neutrino Masses via the Zee Mechanism in 5D split fermions model
• LHC sensitivity to Kalzua-Klein gluon in two b-jets decay channel
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• Kaluza-Klein gluon searches using the three-b-jet decay channel at the Large Hadron Collider