dorsal/arxiv
View SchemaTransition from Baryon- to Meson-Dominated Freeze Out -- Early Decoupling around 30 A GeV?
| Authors | H. Oeschler, J. Cleymans, K. Redlich, S. Wheaton |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0701080 |
| URL | https://arxiv.org/abs/nucl-th/0701080 |
| DOI | 10.1088/0954-3899/32/12/S28 |
| Journal | J.Phys.G32:S223-S229,2006 |
Abstract
The recently discovered sharp peak in the excitation function of the K+/pi+ ratio around 30 A GeV in relativistic heavy-ion collisions is discussed in the framework of the Statistical Model. In this model, the freeze-out of an ideal hadron gas changes from a situation where baryons dominate to one with mainly mesons. This transition occurs at a temperature T = 140 MeV and baryon chemical potential mu(B) = 410 MeV corresponding to an energy of sqrt(s) = 8.2 GeV. The calculated maximum in the K+/pi+ ratio is, however, much less pronounced than the one observed by the NA49 Collaboration. The smooth increase of the K-/pi- ratio with incident energy and the shape of the excitation functions of the Lambda/pi+, Xi-/pi+ and Omega/pi ratios all exhibiting maxima at different incident energies, is consistent with the presently available experimental data. The measured K+/pi+ ratio exceeds the calculated one just at the incident energy when the freeze-out condition is changing. We speculate that at this point freeze-out might occur in a modified way. We discuss a scenario of an early freeze-out which indeed increases K+/pi+ ratio while most other particle ratios remain essentially unchanged. Such an early freeze-out is supported by results from HBT studies.
{
"annotation_id": "7518f3ef-f8db-4eff-8118-477034ca1791",
"date_created": "2026-03-02T18:00:11.214000Z",
"date_modified": "2026-03-02T18:00:11.214000Z",
"file_hash": "1e46819a9139dd9aa7b83c0a02830a85b0c22334ab72323b15e61a674eac0f17",
"private": false,
"record": {
"abstract": "The recently discovered sharp peak in the excitation function of the K+/pi+\nratio around 30 A GeV in relativistic heavy-ion collisions is discussed in the\nframework of the Statistical Model. In this model, the freeze-out of an ideal\nhadron gas changes from a situation where baryons dominate to one with mainly\nmesons. This transition occurs at a temperature T = 140 MeV and baryon chemical\npotential mu(B) = 410 MeV corresponding to an energy of sqrt(s) = 8.2 GeV. The\ncalculated maximum in the K+/pi+ ratio is, however, much less pronounced than\nthe one observed by the NA49 Collaboration. The smooth increase of the K-/pi-\nratio with incident energy and the shape of the excitation functions of the\nLambda/pi+, Xi-/pi+ and Omega/pi ratios all exhibiting maxima at different\nincident energies, is consistent with the presently available experimental\ndata. The measured K+/pi+ ratio exceeds the calculated one just at the incident\nenergy when the freeze-out condition is changing.\n We speculate that at this point freeze-out might occur in a modified way. We\ndiscuss a scenario of an early freeze-out which indeed increases K+/pi+ ratio\nwhile most other particle ratios remain essentially unchanged. Such an early\nfreeze-out is supported by results from HBT studies.",
"arxiv_id": "nucl-th/0701080",
"authors": [
"H. Oeschler",
"J. Cleymans",
"K. Redlich",
"S. Wheaton"
],
"categories": [
"nucl-th"
],
"doi": "10.1088/0954-3899/32/12/S28",
"journal_ref": "J.Phys.G32:S223-S229,2006",
"title": "Transition from Baryon- to Meson-Dominated Freeze Out -- Early Decoupling around 30 A GeV?",
"url": "https://arxiv.org/abs/nucl-th/0701080"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "73ed6f03-f93a-4eaa-860e-4bcf0cd34ba2",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}