Physics
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprl11008s&link_type=abstract
American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #L11.008
Physics
Scientific paper
A major emphasis of the RHIC spin program at BNL is to study the spin-flavor structure of the proton based on the production of W^-(+) bosons. W^-(+) bosons are produced at leading order in u+d,d+u) collisions and detected at RHIC through their leptonic decays, l+νl,l+νl), where only the respective charged lepton is measured. At forward rapidity, PHENIX completed the needed upgrades of the muon spectrometers to observe muons from W^± decays and is ready for polarized p+p collisions at √s=500 GeV in 2012. The upgrades included new electronics transferring information from the muon tracking systems to the level 1 trigger processors and new fast Resistive Plate Chamber (RPC) tracking stations up and down stream of the PHENIX muon spectrometers. In 2011, the up stream RPC tracking stations were not yet installed, PHENIX collected approximately 17 pb-1 of polarized p+p collisions at √s=500 GeV with the forward muon detectors. The status of the data analysis towards W^± cross sections for the ±circ; channels, at forward rapidity, will be presented. The proton beams had a longitudinal polarization of approximately 46%, and progress on extracting W-decay muon single spin asymmetry will be reported.
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