Abstract
The STAR experiment at the Relativistic Heavy-Ion Collider at Brookhaven National Laboratory is providing fundamental measurements in high-energy polarized p+p collisions at s = 200–500GeV to deepen our understanding on the spin structure and dynamics of the proton. This program has completed the first data taking period in 2009 of polarized p+p collisions at s = 500GeV. This opens a new era in the study of the spin-flavor structure of the proton based on the production of W−(+) bosons. The measurement of the cross section and single-spin asymmetries for midrapidity decay positrons and electrons from W+ and W− boson production in longitudinally polarized p+p collisions at s = 500GeV is presented along with a discussion of future prospects.
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