Temperature dependent formation-time approach for $\Upsilon$ suppression at energies available at the CERN Large Hadraon Collider

TL;DR

This paper develops a temperature-dependent formation-time model for bottomonium suppression in quark-gluon plasma at LHC energies, incorporating various physical effects and comparing two methods for calculating formation times, matching experimental data.

Contribution

It introduces a novel approach to determine bottomonium formation times using temperature-dependent Schrödinger equations and integrates this into a comprehensive suppression model.

Findings

Model closely matches LHC suppression data.

Temperature-dependent formation times are consistent across methods.

Inclusion of cold nuclear matter effects improves accuracy.

Abstract

We present here a comprehensive model to describe the bottomonium suppression data obtained from the CERN Large Hadron Collider (LHC) at center-of-mass energy of $\sqrt{s_{NN}}=2.76$ TeV. We employ a quasiparticle model (QPM) equation of state for the quark-gluon plasma (QGP) expanding under Bjorken's scaling law. The current model includes the modification of the formation time based on the temperature of the QGP, color screening during bottomonium production, gluon induced dissociation and collisional damping due to the imaginary part of the potential between the $b\bar b$ pair. We propose a method for determining the temperature-dependent formation time of bottomonia using the solution of the time-independent Schr\"{o}dinger equation and compare it with another approach based on time-dependent Schr\"{o}dinger wave equation simulation. We find that these two independent methods based on different axioms give similar results for the formation time. Cold nuclear matter effects and feed-down from higher resonance states of $\Upsilon$ have also been included in the present work. The suppression of the bottomonium states at mid rapidity is determined as a function of centrality. The results compare closely with the recent centrality-dependent suppression data at the energies available at the CERN LHC in the mid rapidity region.