Pion Transverse Momentum Spectrum, Elliptic Flow and Interferometry in the Granular Source Model in Ultra-Relativistic Heavy Ion Collisions

TL;DR

This paper evaluates a granular source model of quark-gluon plasma droplets to explain pion spectra, elliptic flow, and interferometry in ultra-relativistic heavy ion collisions, successfully matching experimental data across energies.

Contribution

It introduces a granular source model with specific initial energy distributions that accurately reproduces experimental observations in heavy ion collisions.

Findings

The model fits Au-Au and Pb-Pb collision data at different energies.

Parameters show regular patterns with collision centrality and energy.

The model provides insights into the initial energy distribution of droplets.

Abstract

We systematically investigate the pion transverse momentum spectrum, elliptic flow, and Hanbury-Brown-Twiss (HBT) interferometry in the granular source model of quark-gluon plasma droplets in ultra-relativistic heavy ion collisions. The granular source model can well reproduce the experimental results of the Au-Au collisions at $\sqrt{s_{NN}}=$ 200 GeV and the Pb-Pb collisions at $\sqrt{s_{NN}} =$ 2.76 TeV with different centralities. We examine the parameters of the granular source models with an uniform and Woods-Saxon initial energy distributions in a droplet. The parameters exhibit certain regularities for collision centrality and energy.