Neutral Pion Double Helicity Asymmetry in Polarized Proton-Proton Collisions at √s=200 GeV at STAR

Details Neutral Pion Double Helicity Asymmetry in Polarized Proton-Proton Collisions at √s=200 GeV at STAR Neutral Pion Double Helicity Asymmetry in Polarized Proton-Proton Collisions at √s=200 GeV at STAR

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprl11003l&link_type=abstract

American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #L11.003

Physics

Scientific paper

One of the primary goals of the spin physics program at the STAR experiment is to constrain the polarized gluon distribution function δ(g)(x,Q^2) by measuring the double helicity asymmetry, ALL, of various final-state channels. Neutral pions are a potentially powerful final state because they are copiously produced in p+p collisions and have few backgrounds. STAR can identify neutral pions using its large-acceptance electromagnetic calorimeter, combined with a track veto from the STAR Time Projection Chamber. I will present progress towards measuring an ALL for neutral pions using ˜14 pb-1 of integrated luminosity taken during the 2009 200 GeV p+p run.

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