J/psi Elliptic Flow, High pT Suppression and Upsilon Measurements in A+A Collisions by the PHENIX Experiment

TL;DR

This paper reports on measurements of J/psi elliptic flow, high transverse momentum suppression, and Upsilon production in heavy ion collisions, providing insights into quarkonia behavior under extreme conditions and highlighting the need for higher luminosities.

Contribution

It presents the first upper limit measurement of Upsilon suppression and demonstrates the importance of J/psi flow and suppression measurements as proofs of principle.

Findings

J/psi elliptic flow measured, but with limited statistical significance.

High pT suppression observed, emphasizing the need for higher luminosity.

Upsilon suppression upper limit set at 0.64 with 90% confidence level.

Abstract

Three measurements that broaden the scope of the experimental investigation of quarkonia modifications in heavy ion collisions are presented. Although the current statistical precision on the first two measurements does not allow one to draw significant conclusions, J/$\psi$ elliptic flow and high pT suppression results are important proofs of principle measurements, and make the case for higher luminosities at RHIC. Finally, the first measurement of an upper limit on the nuclear modification R_AA of dielectrons in the $\Upsilon$ mass region in Au+Au collisions is presented. The results show a significant suppression with an upper limit of 0.64 at 90% CL.