Recent Results on $W$ Boson Production in Polarized $p+p$ Collisions at STAR

The production of $W$ bosons in polarized $p+p$ collisions at RHIC provides an excellent tool to probe the proton's sea quark distributions. At leading order $W^{-(+)}$ bosons are produced in $\bar{u}+d\,(\bar{d}+u)$ collisions, and parity-violating single-spin asymmetries measured in longitudinally polarized $p+p$ collisions give access to the flavor-separated light quark and antiquark helicity distributions. In 2012 the STAR experiment collected an integrated luminosity of $\sim$80 pb$^{-1}$ at $\sqrt{s}=510$ GeV with an average beam polarization of $\sim$55\%. Preliminary results from this dataset for the single-spin asymmetry, $A_L$, will be presented as well as future projections for the STAR $W$ program.