High Energy Physics - Experiment
[Submitted on 6 Jun 2010]
Title:Observation of W decay in 500 GeV p+p collisions at RHIC
View PDFAbstract:W boson production is observed in $\sqrt{s}=500$ GeV proton proton collisions at RHIC-PHENIX experiment. The single longitudinal spin asymmetry $A_L(\overrightarrow{p}p\rightarrow W^+X)$ is measured via decay positrons in the mid rapidity region. The asymmetry $-0.83\pm0.31\pm(11%$ scale uncertainty) is consistent with calculations from various polarized parton distribution functions.
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