Abstract
The STAR Collaboration reports measurements of back-to-back azimuthal correlations of di-\pi^0π0 produced at forward pseudorapidity (2.6<\eta<4.02.6<η<4.0) in p+p+pp, p+p+\mathrm{Al}Al and p+p+\mathrm{Au}Au collisions at a center-of-mass energy per nucleon-nucleon pair of 200 GeV. A clear suppression of the correlated away-side yields is observed in p+p+\mathrm{Au}Au and for the first time in p+p+\mathrm{Al}Al collisions, compared with the pp++pp data. The enhanced suppression found in p+p+\mathrm{Au}Au with respect to p+p+\mathrm{Al}Al collisions exhibits the saturation scale (Q_s^2Qs2) dependence on the mass number AA. The observed suppression of back-to-back pairs as a function of event activity and transverse momentum points to non-linear gluon dynamics arising at high parton densities.
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