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During the 2008 run the Relativistic Heavy Ion Collider (RHIC) at theBrookhaven Nation Laboratiory (BNL), NY, provided high luminosity in both p+pand d+Au collisions at $\sqrt{s_{NN}}=200\mathrm{\,GeV}$. Electromagneticcalorimeter acceptance in STAR was enhanced by the new Forward MesonSpectrometer (FMS), and is now almost contiguous from $-1<\eta\4$ over the fullazimuth. This allows measurements of the azimuthal correlation between aforward neutral pion and a second particle in a very large rapidity range.Di-hadron azimuthal correlations provide sensitivity to the low longitudinalmomentum fraction ($x$) component of the gluon density in the nuclear target.Initial state nonlinear effects are in fact expected to appear in d+Aucollisions when the dense part of the nucleus is probed. The analysis in thisthesis shows that such correlations and their dependence on rapidity,transverse momentum and collision centrality are qualitative consistent withthe existence of gluon saturation effects in the relativistic nucleus.Theoretical expectations for azimuthal correlations between a dilute system(deuteron) and a saturated target (Gold nucleus) have been explored.

Two-particle azimuthal correlations at forward rapidity in STAR