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QCD Hard Scattering and the Sign of the Spin Asymmetry<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>A</mml:mi><mml:mrow><mml:mi>LL</mml:mi></mml:mrow><mml:mi>π</mml:mi></mml:msubsup></mml:math>
Recent preliminary PHENIX data are consistent with a negative and sizable longitudinal double-spin asymmetry A(pi)(LL) for pi(0) production at moderate transverse momentum p( perpendicular ) approximately 1-4 GeV and central rapidity. By means of a systematic investigation of the relevant degrees of freedom, we show that the perturbative QCD framework …