# On the Nf and a Dependence of BK

## TL;DR

This paper investigates the dependence of the BK parameter on the number of dynamical flavors using improved lattice operators and multiple ensembles, providing insights into its behavior in different QCD regimes.

## Contribution

It introduces a study of BK with tadpole improved operators across various ensembles, highlighting its small dependence on Nf and extrapolation to the continuum limit.

## Key findings

- BK shows a small dependence on Nf.
- Extrapolation to zero lattice spacing was performed.
- Results contribute to understanding of QCD parameters across different flavors.

## Abstract

We present results of a study of BK using tadpole improved gauge invariant staggered operators. Using three ensembles of 16^3x32 configurations with varying numbers of dynamical flavors, we observe a small dependence on Nf. Using seven quenched ensembles between beta=5.7 and beta=6.2 we extrapolate to a=0.