Quarkonia measurement in p+p and d+Au collisions at sqrt(s)=200 GeV by PHENIX Detector

TL;DR

This paper presents new measurements of quarkonia production in proton-proton and deuteron-gold collisions at 200 GeV, providing insights into production mechanisms and cold nuclear matter effects at RHIC.

Contribution

It reports differential cross sections, polarization data, and revised nuclear modification factors for quarkonia, enhancing understanding of initial state effects and nuclear matter interactions.

Findings

Measured J/psi, Psi', and Upsilon cross sections and polarization.

Revised nuclear modification factors for J/psi in d+Au collisions.

Improved statistical significance of cold nuclear matter effects.

Abstract

We report new quarkonia measurements necessary to understand production mechanisms and cold nuclear matter effects in the yields observed at RHIC energy. Results obtained in p+p collisions collected during the 2006 RHIC Run include J/psi, Psi' and Upsilon differential cross sections as well as J/psi polarization. Revisited interpretations of the published J/psi nuclear modification factors and statistically improved observations in d+Au collisions taken in the 2008 Run are also discussed in the view of the recent understanding of the initial state effects and breakup cross section.