PHENIX Measurement of Parity-Violating Single Spin Asymmetry in W Production in p+p Collisions at 500 GeV

摘要

The flavor-separated polarized parton distribution functions for light quarks and anti-quarks in the proton can be studied in the production of W bosons in p+p collisions. The Ws are produced in processes like u+→W~+ and +d→W~? and we observe the lepton (an electron or muon) from the decay channel W~±→l~±ν. The electron energy spectrum from W decays measured with an integrated luminosity of approximately 10?pb~(?1) will be shown, with a measurement of the electron single spin asymmetry in central rapidity.