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The azimuthal angle distributions of neutral pions at midrapidity from Au+Au reactions at 1 GeV/nucleon incident energy have been measured. An enhanced emission of π⁰'s perpendicular to the reaction plane is observed. The azimuthal asymmetry is dependent on the π⁰ momentum: the π⁰ spectrum perpendicular to the reaction plane is harder than in the reaction plane. The strength of the observed asymmetry appears to be more pronounced for π⁰ than for charged particles and neutrons.
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Venema et al. (1993) studied this question.
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