Measurements of Cold Nuclear Matter Effects on J/psi in the PHENIX Experiment via Deuteron-Gold Collisions

TL;DR

This paper measures cold nuclear matter effects on J/psi production in deuteron-gold collisions, using new calculations and data-driven methods to improve understanding of nuclear modifications and project effects in gold-gold collisions.

Contribution

It introduces a new calculation of R_{dAu} using 2003 and 2005 data, compares nuclear-modified PDFs, and extracts a J/psi breakup cross section, providing improved projections for Au+Au collisions.

Findings

Calculated R_{dAu} using 2003 d+Au and 2005 p+p data

Compared nuclear-modified PDFs with experimental data

Projected cold nuclear matter effects in Au+Au collisions

Abstract

A new calculation of R_{dAu} has been performed using the 2003 d+Au data and the higher-statistics 2005 p+p data. These nuclear modification factors are compared to calculations using nuclear-modified PDFs and a J/psi breakup cross section is extracted. These values are then used to project the cold nuclear matter effects in Au+Au collisions. Additionally, a more data-driven projection is performed.