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The STAR Collaboration reports measurements of back-to-back azimuthalcorrelations of di-$\pi^0$ produced at forward pseudorapidity ($2.6<\eta<4.0$)in $p+$$p$, $p+$$\mathrm{Al}$ and $p+$$\mathrm{Au}$ collisions at acenter-of-mass energy per nucleon-nucleon pair of 200 GeV. A clear suppressionof the correlated away-side yields is observed in $p+$$\mathrm{Au}$ and for thefirst time in $p+$$\mathrm{Al}$ collisions, compared with the $p$$+$$p$ data.The enhanced suppression found in $p+$$\mathrm{Au}$ with respect to$p+$$\mathrm{Al}$ collisions exhibits the saturation scale ($Q_s^2$) dependenceon the mass number $A$. The observed suppression of back-to-back pairs as afunction of event activity and transverse momentum points to non-linear gluondynamics arising at high parton densities.

Di-$\pi^0$ correlations in $p+$$p$, $p+$$\mathrm{Al}$ and $p+$$\mathrm{Au}$ collisions at $\sqrt{s_{\mathrm{_{NN}}}}$ = 200 GeV at STAR