Little Randall-Sundrum models: epsilon_K strikes again

TL;DR

This paper analyzes how 'little Randall-Sundrum' models impact neutral kaon mixing, revealing that constraints from CP violation can be more severe than in original models, depending on the UV cutoff scale.

Contribution

It provides a detailed phenomenological analysis showing that epsilon_K constraints can be stronger in little RS models and derives bounds on the UV cutoff scale.

Findings

epsilon_K constraints can surpass original RS models

A lower bound of several 10^3 TeV on the UV cutoff is established

Implications for non-standard Z->bb couplings are discussed

Abstract

A detailed phenomenological analysis of neutral kaon mixing in "little Randall-Sundrum" models is presented. It is shown that the constraints arising from the CP-violating quantity epsilon_K can, depending on the value of the ultra-violet cutoff, be even stronger than in the original Randall-Sundrum scenario addressing the hierarchy problem up to the Planck scale. The origin of the enhancement is explained, and a bound Lambda_{UV}>several 10^3 TeV is derived, below which vast corrections to epsilon_K are generically unavoidable. Implications for non-standard Z->bb couplings are briefly discussed.