Predictions for Flavour Observables in a RS Model with Custodial Symmetry

TL;DR

This paper analyzes flavor observables in a Randall-Sundrum model with custodial symmetry, focusing on particle mixing, rare decays, and the implications of KK mass bounds, revealing distinctive model signatures and fine-tuning considerations.

Contribution

It provides a detailed analysis of flavor observables in a RS model with custodial symmetry, highlighting the dominant Z boson coupling effects and fine-tuning aspects.

Findings

KK mass scale bound > 20 TeV from epsilon_K

Z boson coupling to right-handed quarks dominates rare decays

Distinctive patterns and correlations differentiate the model from other BSM theories

Abstract

In these proceedings we present the main results for particle-antiparticle mixing and rare decays in the Randall-Sundrum (RS) model with custodial symmetry. To investigate the strong bound on the Kaluza-Klein (KK) mass scale M_KK>O(20)TeV implied by the measurement of epsilon_K we perform a fine-tuning analysis on the one hand confirms the quoted bound on the KK mass scale but on the other hand reveals that consistence with experiment can still be achieved for small or moderate fine-tuning. In our analysis of rare decays of K and B mesons we find that due to the custodial symmetry the coupling of the Z boson to right handed quarks yields the dominant contribution. This feature of the model leads to distinct patterns and correlations that allow to distinguish the model from other frameworks of physics beyond the Standard Model (SM).