Getting bounds on the mixing angles for a non-sequential bottom quark

TL;DR

This paper investigates the effects of a non-sequential bottom quark on Z boson decay observables, deriving bounds on mixing angles using LEP/SLC data and B decay results.

Contribution

It provides new bounds on mixing angles for a non-sequential bottom quark by analyzing Z decay data and B decay constraints.

Findings

Bounds on mixing angles from LEP/SLC data

Constraints from B→ννX decays

Parameter regions consistent with experimental data

Abstract

We analyze the vertex Zff in the framework of models that add a new bottom quark in a nonsequential way and we evaluate the tree level contribution to LEP/SLC data $R_{b}$, $R_{l}$ and the total Z width $\Gamma_{Z}$. We obtain bounds for the mixing angles through the experimentally allowed contour regions of the parameters $\Lambda_{L,R}$ introduced here. In order to get a more restrictive region, we also consider the experimental results for $B\to \nu \nu X$ as well.