Charmonium Transverse Momentum Distribution in High Energy Nuclear Collisions

TL;DR

This paper investigates how the transverse momentum distribution of charmonium in high energy nuclear collisions reveals details about the hot QCD medium, using a combined transport and hydrodynamic model to distinguish effects at different collider energies.

Contribution

It introduces a detailed transport-hydrodynamic approach to analyze charmonium transverse momentum, highlighting the role of dissociation and regeneration effects in different energy regimes.

Findings

Transverse momentum distribution is more sensitive than yield to medium properties.

Second moment of the distribution can differentiate between SPS, RHIC, and LHC energies.

Balance between dissociation and regeneration influences the distribution shape.

Abstract

The Charmonium transverse momentum distribution is more sensitive to the nature of the hot QCD matter created in high energy nuclear collisions, in comparison with the yield. Taking a detailed transport approach for charmonium motion together with a hydrodynamic description for the medium evolution, the cancelation between the two hot nuclear matter effects, the dissociation and the regeneration, controls the charmonium transverse momentum distribution. Especially, the second moment of the distribution can be used to differentiate between the hot mediums produced at SPS, RHIC and LHC energies.