Flavor Tagging using electrons at the D\O\ Detector at Fermilab

Flavor tagging of $B$ hadrons is crucial for the measurement of mixing in the $b$-quark sector. Using approximately $450\;\rm pb^{-1}$ of data collected with upgraded D\O\ detector in Run II of Fermilab Tevatron, we present preliminary results on $b$-flavor tagging using electrons. This is the first analysis at D\O\ that uses electrons for tagging the flavor of $b$ quarks at their production time.