HoTCoffeeh: Hanbury Brown-Twiss correlation functions and radii from event-by-event hydrodynamics

Abstract

$\text{HoTCoffeeh}$ ($\text{H}$anbury Br$\text{o}$wn-$\text{T}$wiss $\text{Co}$rrelation $\text{f}$unctions and radii $\text{f}$rom $\text{e}$vent-by-$\text{e}$vent $\text{h}$ydrodynamics) is a new computational tool which determines Hanbury Brown-Twiss (HBT) charged pion (${\pi }^{+}$) correlation functions and radii for event-by-event (EBE) hydrodynamics with fluctuating initial conditions in terms of Cooper-Frye integrals, including resonance decay contributions. In this paper, we review the basic formalism for computing the HBT correlation functions and radii with resonance decay contributions included, and discuss our implementation of this formalism in the form of HoTCoffeeh. This tool may be easily integrated with other numerical packages for the purpose of simulating the evolution of heavy-ion collisions and thereby extracting predictions for heavy-ion observables.

24 pages, 13 figures. This version corrects an error in version 1 in the computation of the resonance decay contributions. An appendix explaining the numerical code in greater detail was added. While many numerical results are affected by this correction, all main conclusions from version 1 remain valid. This version accepted by Phys. Rev. C

References in corpus (7)

• Big-Bang Nucleosynthesis
• Fully integrated transport approach to heavy ion reactions with an intermediate hydrodynamic stage
• Therminator: Thermal heavy-Ion generator
• Event-by-event mean $p_{\mathrm{T}}$ fluctuations in pp and Pb-Pb collisions at the LHC
• Fitted HBT radii versus space-time variances in flow-dominated models
• Interferometric signatures of the temperature dependence of the specific shear viscosity in heavy-ion collisions
• Observable consequences of event-by-event fluctuations of HBT radii

Cited by in corpus (5)

• Hanbury Brown--Twiss Interferometry and Collectivity in Small Systems
• Temperatures and chemical potentials at kinetic freeze-out in relativistic heavy ion collisions from coarse grained transport simulations
• The Shape of the Correlation Function
• Comment on "Evaluation of kinetic freeze-out properties in different relativistic heavy-ion collision systems at \sqrtsNN = 200 GeV'' (Eur. Phys. J. Plus (2025) 140:179) https://doi.org/10.1140/epjp/s13360-025-06119-0
• Long-range azimuthal correlations for partially coherent pion emission in proton-proton collisions