Preliminary measurement of B(τ−→K−π0ντ) using the BaBar detector

A preliminary measurement of the branching fraction B(τ−→K−π0ντ) is made using 124.4 fb−1 of e+e− collision data provided by the PEP-II accelerator, operating primarily at s=10.58 GeV, and recorded using the BaBar detector. We measure: B(τ−→K−π0ντ)=(0.438±0.004(stat)±0.022(syst))%. This result is the world's most precise measurement of this branching fraction to date and is consistent with the world average.