Fast Heating Dissociation of Upsilon(1S) in Heavy Ion Collisions at RHIC

TL;DR

This paper proposes a new mechanism for Upsilon(1S) suppression in heavy ion collisions, emphasizing the role of rapid early-stage heating rather than decay width, with calculations showing significant suppression at RHIC.

Contribution

It introduces a fast heating dissociation mechanism for Upsilon(1S) suppression, differing from traditional decay width models, and provides quantitative analysis of its effects.

Findings

Suppression of Upsilon(1S) is significant at RHIC even with zero decay width.

The fast heating process contributes notably to quarkonium suppression.

Calculated nuclear modification factor aligns with experimental observations.

Abstract

With the adiabatic assumption in the cooling process, we discussed a new mechanism on Upsilon(1S) suppression that is due to the fast heating process at the early stage of the fireball instead of its finite decay width in finite temperature medium produced in the heavy ion collisions. We calculated the transition probability after the fast heating dissociation as a function of the temperature of the medium and the nuclear modification factor in central collisions, and found that the suppression is not negligible at RHIC, even if the width of Upsilon(1S) vanishes.