arXiv:hep-ph/9909299·v4·High Energy Physics — Phenomenology

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

R. Martinez · J-Alexis Rodriguez · M. Vargas (Dpto. de Fisica, Universidad Nacional de Colombia Bogota, Colombia)

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 $Γ_{Z}$ . We obtain bounds for the mixing angles through the experimentally allowed contour regions of the parameters $Λ_{L, R}$ introduced here. In order to get a more restrictive region, we also consider the experimental results for $B \to ν ν X$ as well.

Comments: 5 pages, LateX,1 figure: eps format, 3 tables. Final version, to appear in Physical Review D