Status of Flavour Maximal Non-minimal Universal Extra Dimension

TL;DR

This paper explores a universal extra dimension model with flavor-dependent brane kinetic terms, analyzing constraints from various experiments and the potential to explain the $R_{K^{(*)}}$ anomaly.

Contribution

It introduces a flavor-maximal non-minimal universal extra dimension scenario with specific brane kinetic terms and examines its phenomenological implications.

Findings

Constraints from dark matter, electroweak, Higgs, and LHC data limit the model parameters.

The scenario can potentially explain the $R_{K^{(*)}}$ anomaly within allowed parameter space.

The flavor structure is governed by a specific $U(2)$ symmetry due to flavor bounds.

Abstract

In this paper we consider an $S^{1}/\mathbb{Z}_2$ compactified flat extra dimensional scenario where all the standard model states can access the bulk and have generalised brane localised kinetic terms. The flavour structure of brane kinetic terms for the standard model fermions are dictated by stringent flavour bounds on the first two generations implying an $U(2)_{Q_L} \otimes U(2)_{u_R} \otimes U(2)_{d_R}$ flavour symmetry. We consider the constraints on such a scenario arising from dark matter relic density and direct detection measurements, precision electroweak data, Higgs physics and LHC dilepton searches. We discuss the possibility of such a scenario providing an explanation of the recently measured anomaly in $R_{K^{(\ast)}}$ within the allowed region of the parameter space.