# $g_\mu-2$ from Vector-Like Leptons in Warped Space

## TL;DR

This paper explores how vector-like leptons in warped extra-dimensional models can explain the muon g-2 anomaly, consistent with LHCb anomalies and existing constraints, predicting detectable signals at the LHC.

## Contribution

It demonstrates that vector-like leptons in warped space models can account for the muon g-2 anomaly while satisfying all current experimental constraints.

## Key findings

- Vector-like leptons can explain muon g-2 in warped extra dimensions.
- Lower bounds on vector-like lepton mass are around 270 GeV.
- Model predicts detectable signals at the LHC.

## Abstract

The experimental value of the anomalous magnetic moment of the muon, as well as the LHCb anomalies, point towards new physics coupled non-universally to muons and electrons. Working in extra dimensional theories, which solve the electroweak hierarchy problem with a warped metric, strongly deformed with respect to the AdS$_5$ geometry at the infra-red brane, the LHCb anomalies can be solved by imposing that the bottom and the muon have a sizable amount of compositeness, while the electron is mainly elementary. Using this set-up as starting point we have proven that extra physics has to be introduced to describe the anomalous magnetic moment of the muon. We have proven that this job is done by a set of vector-like leptons, mixed with the physical muon through Yukawa interactions, and with a high degree of compositeness. The theory is consistent with all electroweak indirect, direct and theoretical constraints, the most sensitive ones being the modification of the $Z\bar\mu\mu$ coupling, oblique observables and constraints on the stability of the electroweak minimum. They impose lower bounds on the compositeness ($c\lesssim 0.37$) and on the mass of the lightest vector-like lepton ($\gtrsim 270$ GeV). Vector-like leptons could be easily produced in Drell-Yan processes at the LHC and detected at $\sqrt{s}=13$ TeV.