[RBRC Hybrid Seminar] Probing nonlinear gluon effects by forward di-hadron correlation

by Xiaoxuan Chu (BNL)

Thursday 28 Apr 2022, 12:30 → 13:30 US/Eastern

2-160

The back-to-back di-\pi^{0} correlation functions in forward directions have been observed to be suppressed for p(d)+A collisions relative to p+p collisions. The nonlinear gluon dynamics in nuclei is one of the possible mechanisms responsible for the suppression. In addition, theorists pointed out that the double-parton scattering (DPS) can be an alternative explanation of the suppression in d+A collisions. During the 2015 and 2016 RHIC runs, STAR collected data with the Forward Meson Spectrometer (FMS, 2.6<\eta<4.0) in p+p, p+Al, p+Au, and d+Au collisions at \sqrt{s_{NN}}=200 GeV. The recorded datasets enable the measurements of di-\pi^{0} azimuthal correlations in p+p and p+A collisions with different mass numbers. Meanwhile, a comparison of the correlations in d+Au and p+Au collisions provides an opportunity to study the impact of DPS. In this talk, we will present the results on di-\pi^{0} correlations at forward rapidities in p+p and p+A collisions, together with the new preliminary results in d+Au collisions.

RBRC_xchu.pdf