Spheroidal expansion and freeze-out geometry of heavy-ion collisions in the few-GeV energy regime

Hanna Paulina Zbroszczyk; J\k{e}drzej Ko{\l}a\'s; Joachim Stroth; Ma{\l}gorzata Gumberidze; Piotr Salabura; Rados{\l}aw Ryblewski; Szymon Harabasz; Tetyana Galatyuk; Wojciech Florkowski

Spheroidal expansion and freeze-out geometry of heavy-ion collisions in the few-GeV energy regime

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arxiv 2210.07694 v2 pith:2ZU5DQYS submitted 2022-10-14 nucl-th

Spheroidal expansion and freeze-out geometry of heavy-ion collisions in the few-GeV energy regime

Szymon Harabasz , J\k{e}drzej Ko{\l}a\'s , Rados{\l}aw Ryblewski , Wojciech Florkowski , Tetyana Galatyuk , Ma{\l}gorzata Gumberidze , Piotr Salabura , Joachim Stroth

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Hanna Paulina Zbroszczyk

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A spheroidal model of the expansion of hadronic matter produced in heavy-ion collisions in the few-GeV energy regime is proposed. It constitutes an extension of the spherically symmetric Siemens-Rasmussen blast-wave model used in our previous works. The spheroidal form of the expansion, combined with a single-freeze-out scenario, allows for a significantly improved description of both the transverse-mass and the rapidity distributions of the produced particles. With the model parameters determined by the hadronic abundances and spectra, we make further predictions of the pion HBT correlation radii that turn out to be in a qualitative agreement with the measured ones. The overall successful description of the data supports the concept of spheroidal symmetry of the produced hadronic systems in this energy range.

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An expanding spherical fireball model for light hadron production at RHIC ($\sqrt{s_{\rm NN}}=7.7$--$39$ GeV)
nucl-th 2026-07 conditional novelty 4.0

An expanding spherical fireball model with Cooper–Frye freeze-out describes STAR pT spectra of π±, K±, p, p̄ at √sNN=7.7–39 GeV and predicts Gaussian rapidity distributions.