  We present measurements from the PHENIX experiment of large parity-violating
single spin asymmetries of high transverse momentum electrons and positrons
from $W^\pm/Z$ decays, produced in longitudinally polarized $p$$+$$p$
collisions at center of mass energies of $\sqrt{s}$=500 and 510~GeV. These
asymmetries allow direct access to the anti-quark polarized parton distribution
functions due to the parity-violating nature of the $W$-boson coupling to
quarks and anti-quarks. The results presented are based on data collected in
2011, 2012, and 2013 with an integrated luminosity of 240 pb$^{-1}$, which
exceeds previous PHENIX published results by a factor of more than 27. These
high $Q^2$ data provide an important addition to our understanding of
anti-quark parton helicity distribution functions.

High Energy Physics - Experiment