Neutral Pion Double Longitudinal Spin Asymmetry in Proton-Proton   Collisions at sqrt(s)=200 GeV Using the PHENIX Detector
  New results from polarized p-p collisions at sqrt(s)=200 GeV of double longitudinal spin asymmetry in pi0 production using the PHENIX detector in the 2005 RHIC run are presented. Both positive and negative maximal gluon polarization scenarios are inconsistent with the data. The data is consistent with small |\Delta g|, including \Delta g=0. 
Kieran Boyle (for the PHENIX collaboration)