# $B$ anomalies in the nonminimal universal extra dimension model

## TL;DR

This paper explores how nonminimal universal extra dimension models can explain the B anomalies by fitting new polarization and ratio data, showing good overall fit but still significant deviations from Standard Model predictions.

## Contribution

It introduces a comprehensive analysis of B anomalies within nonminimal universal extra dimension models, incorporating recent polarization measurements and ratios to evaluate their explanatory power.

## Key findings

- Model fits global data well with chi-squared near unity.
- Predicted B_c→τν branching ratios are a few percent.
- R(D) and R(D*) results remain about 2σ away from Standard Model predictions.

## Abstract

We investigate the $B$ anomalies in the framework of the nonminimal universal extra dimension models. Newly measured polarization parameters in $B\to D^{(*)}\tau\nu$, $P_\tau(D^{(*)})$ and $F_L(D^*)$ as well as the ratios $R(D^{(*)})$ are considered altogether. The Kaluza-Klein modes of the $W$-boson and charged scalar contributes as the new physics effects. We find that the model parameters fit the global data very well with the minimum $\chi^2/{\rm d.o.f.}$ near unity, rendering $B_c\to\tau\nu$ branching ratios to be a few percents. The best-fit values of $R(D)$ and $R(D^*)$ are still far from ($\gtrsim 2\sigma$) the standard model predictions.