$\mathcal{R}(D^{(*)})$ anomalies in light of Non-Minimal Universal Extra Dimension

TL;DR

This paper investigates how non-minimal Universal Extra Dimension models with boundary localized terms can explain anomalies in lepton flavor universality ratios $ (D)$ and $ (D^*)$, considering experimental constraints.

Contribution

It provides an analysis of KK excitations' effects in non-minimal Universal Extra Dimensions on $ (D)$ and $ (D^*)$ anomalies, identifying viable parameter space.

Findings

Allowed parameter space consistent with $B_c o au u$ constraints.

Compatibility with electroweak precision tests.

Potential explanation for $ (D)$ and $ (D^*)$ anomalies.

Abstract

We estimate contributions from Kaluza-Klein excitations of gauge bosons and physical charge scalar for the explanation of the lepton flavor universality violating excess in the ratios $\mathcal{R}(D)$ and $\mathcal{R}(D^*)$ in 5 dimensional Universal Extra Dimensional scenario with non-vanishing boundary localized terms. This model is conventionally known as non-minimal Universal Extra Dimensional model. We obtain the allowed parameter space in accordance with constraints coming from $B_c \to \tau \nu$ decay, as well as those from the electroweak precision tests.