# 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.

## Key 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.