J/$\psi$ Production in p+p and d+Au Collisions at $\sqrt{S_{NN}}$ = 200 GeV at STAR

TL;DR

This paper reports on J/ψ meson production measurements in proton-proton and deuteron-gold collisions at 200 GeV, exploring forward rapidity regions and cold nuclear matter effects using STAR's advanced detectors.

Contribution

It provides new data on J/ψ production at forward rapidities and investigates the intrinsic charm component of the proton wave function using STAR's forward calorimeter.

Findings

Extended understanding of J/ψ production mechanisms at forward rapidity

Insights into cold nuclear matter effects on heavy quarkonium

Potential evidence for intrinsic charm in the proton

Abstract

We present analysis of J/$\psi$ production over the range $-1.0 < \eta < 4.2$ in p+p and d+Au collisions using di-electron data taken during the 2008 run with the STAR experiment at Brookhaven National Laboratory. STAR's unique forward capabilities, especially the Forward Meson Spectrometer electromagnetic calorimeter, allow us the possibility of investigating the intrinsic charm components of the proton wave function using high-$x_F$ forward particles produced in asymmetric partonic collisions. Mid-rapidity measurements in d+Au collisions extend our understanding of the mechanisms underlying heavy quarkonium production and its transport through cold nuclear matter.