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We report the measurement of the parity violating single spin asymmetries forinclusive high transverse momentum electrons and positrons in polarized $p+p$collisions at a center of mass energy of $\sqrt{s}=500$ GeV with the PHENIXdetector at RHIC. These electrons are attributed to the decay of $W^\pm$ and$Z^0$ bosons, and measured production cross section is consistent with theexpectations. The $W$ production is confirmed for the first time in $p+p$collisions. Its spin asymmetry in the polarized $p+p$ collisions is a importantprobe for the quark flavor decomposition of the proton spin.

Measurement of Longitudinal Spin Asymmetries From $W\rightarrow e$ Boson Decay in Polarized pp Collisions at $\sqrt{s}=500$ GeV at RHIC-PHENIX