Flavor Physics in Warped Space

TL;DR

This paper reviews how warped extra dimensional models address flavor violation constraints, showing that higher KK masses suppress most flavor violations but still face challenges in the lepton sector, especially for muon decays.

Contribution

It provides a comprehensive analysis of flavor violation constraints in warped space models, highlighting the necessity of high KK masses and the differences between minimal and custodial scenarios.

Findings

KK masses suppress quark flavor violation effectively

Lepton sector constraints require KK masses ≥ 20 TeV

CP violation in K and D mixing remains a challenge

Abstract

We review constraints from quark and lepton flavor violation on extra dimensional models with warped geometry, both in the minimal and the custodial model. For both scenarios, KK masses that are large enough to suppress constraints from electroweak precision tests also sufficiently suppress all quark flavor and CP violation, with the exception of CP violation in $K\bar K$ mixing and (to a lesser extend) in $D\bar D$ mixing. In the lepton sector the minimal scenario leads to excessively large contributions to $\mu\to e\gamma$ transitions, requiring KK masses of at least 20 TeV or larger.