Fast Generators of Direct Photons

TL;DR

This paper introduces three rapid generators for direct photon production in high-energy heavy-ion collisions, based on experimental data and hydrodynamic models, with applications to SPS, RHIC, and LHC energies.

Contribution

The paper presents new fast computational generators for direct photons, incorporating prompt and thermal sources, suitable for high-energy collision analysis.

Findings

QGP scenario fits SPS and RHIC data better.

Predictions made for LHC energies.

Generators implemented as ROOT macros.

Abstract

Three fast generators of direct photons in the central rapidity region of high-energy heavy-ion collisions have been presented The generator of prompt photons is based on a tabulation of $p+p(\bar p)$ data and binary scaling. Two generators of thermal direct photons, for hot hadron gas (HHG) and quark-gluon plasma (QGP) scenarios, assume the 1+1 Bjorken hydrodynamics. SPS and RHIC data can be fitted better by scenario with QGP. Predictions for the LHC energy have been made. The generators have been realized as macros for the ROOT analysis package.