Adare, A Gluon-spin contribution to the proton spin from the double-helicity asymmetry in inclusive pi0 production in polarized p+p collisions at [sqrt]s=200 GeV. [electronic resource] - Physical review letters Jul 2009 - 012003 p. digital Publication Type: Journal Article ISSN: 0031-9007 Standard No.: 10.1103/PhysRevLett.103.012003 doi