Measurement of the Cross Section for $W$ Boson Production at $\sqrt{s}=500$ GeV at STAR

The production of $W^{-(+)}$ bosons in longitudinally polarized p+p collisions at RHIC provides a new means of studying the spin-flavor asymmetries of the proton sea quark distributions. $W^{-(+)}$ bosons are produced in $\bar{u}+d\,(\bar{d}+u)$ collisions and can be detected through their leptonic decays, $e^{-}+\bar{\nu}_{e}\,(e^{+}+\nu_{e})$, where only the charged lepton is detected. Precise tracking information, provided by the STAR Time Projection Chamber (TPC) at mid-rapidity, allows for a determination of the charge sign of the high $p_T$ $e^{-(+)}$. The large acceptance of the TPC and Electromagnectic Calorimeters is well suited to place isolation requirements on the $e^{-(+)}$ and to veto on the away side energy, which reduces the large QCD background by several orders of magnitude yielding a clean $W$ signal. The status of the $W$ production cross section analysis from the STAR Collaboration's 2009 data at $\sqrt{s}=500$ GeV will be presented.