Looking forward for Color Glass Condensate signatures

TL;DR

This paper reports measurements of forward neutral pion production and azimuthal correlations in proton-proton and deuteron-gold collisions at RHIC, aiming to identify signs of gluon saturation at small momentum fractions.

Contribution

It presents the first results from the Forward Meson Spectrometer at STAR on azimuthal correlations involving forward π^0, exploring gluon saturation signatures.

Findings

Observed azimuthal correlations differ between p+p and d+Au collisions.

Results suggest potential onset of gluon density saturation at small momentum fractions.

Provides new experimental data for understanding gluon saturation phenomena.

Abstract

Forward $\pi^0$ production has been measured at STAR with the new Forward Meson Spectrometer (FMS) from p+p and d+Au collisions during the 2008 RHIC run. We present the first FMS results of azimuthal correlation involving a forward $\pi^0$ produced in p+p and d+Au collisions to search for the onset of gluon density saturation, expected to occur at small momentum fractions.