K^-/K^+ ratio in heavy-ion collisions with an antikaon self-energy in hot and dense matter
The $K^-/K^+$ ratio produced in heavy-ion collisions at GSI energies is studied. The in-medium properties at finite temperature of the hadrons involved are included, paying a special attention to the in-medium properties of antikaons. Using a statistical approach, it is found that the determination...
| Autores: | , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2003 |
| País: | España |
| Institución: | Universidad de Barcelona |
| Repositorio: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/11005 |
| Acceso en línea: | https://hdl.handle.net/2445/11005 |
| Access Level: | acceso abierto |
| Palabra clave: | Reaccions nuclears Constitució de la matèria Col·lisions (Física nuclear) Nuclear reactions Constitution of matter Collisions (Nuclear physics) |
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K^-/K^+ ratio in heavy-ion collisions with an antikaon self-energy in hot and dense matterTolós Rigueiro, LauraPolls Martí, ArturRamos Gómez, ÀngelsSchaffner-Bielich, JürgenReaccions nuclearsConstitució de la matèriaCol·lisions (Física nuclear)Nuclear reactionsConstitution of matterCollisions (Nuclear physics)The $K^-/K^+$ ratio produced in heavy-ion collisions at GSI energies is studied. The in-medium properties at finite temperature of the hadrons involved are included, paying a special attention to the in-medium properties of antikaons. Using a statistical approach, it is found that the determination of the temperature and chemical potential at freeze-out conditions compatible with the ratio $K^-/K^+$ is very delicate, and depends very strongly on the approximation adopted for the antikaon self-energy. The use of an energy dependent $\bar{K}$ spectral density, including both s and p-wave components of the $\bar{K}N$ interaction, lowers substantially the freeze-out temperature compared to the standard simplified mean-field treatment and gives rise to an overabundance of $K^-$ production in the dense and hot medium. Even a moderately attractive antikaon-nucleus potential obtained from our self-consistent many-body calculation does reproduce the ``broad-band equilibration'' advocated by Brown, Rho and Song due to the additional strength of the spectral function of the $K^-$ at low energiesThe American Physical Society2003info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/11005Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevC.68.024903Physical Review C, 2003, vol. 68, núm. 2, p. 024903-1, 024903-11http://doi.org/10.1103/PhysRevC.68.024903(c) The American Physical Society, 2003info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/110052026-05-27T06:46:51Z |
| dc.title.none.fl_str_mv |
K^-/K^+ ratio in heavy-ion collisions with an antikaon self-energy in hot and dense matter |
| title |
K^-/K^+ ratio in heavy-ion collisions with an antikaon self-energy in hot and dense matter |
| spellingShingle |
K^-/K^+ ratio in heavy-ion collisions with an antikaon self-energy in hot and dense matter Tolós Rigueiro, Laura Reaccions nuclears Constitució de la matèria Col·lisions (Física nuclear) Nuclear reactions Constitution of matter Collisions (Nuclear physics) |
| title_short |
K^-/K^+ ratio in heavy-ion collisions with an antikaon self-energy in hot and dense matter |
| title_full |
K^-/K^+ ratio in heavy-ion collisions with an antikaon self-energy in hot and dense matter |
| title_fullStr |
K^-/K^+ ratio in heavy-ion collisions with an antikaon self-energy in hot and dense matter |
| title_full_unstemmed |
K^-/K^+ ratio in heavy-ion collisions with an antikaon self-energy in hot and dense matter |
| title_sort |
K^-/K^+ ratio in heavy-ion collisions with an antikaon self-energy in hot and dense matter |
| dc.creator.none.fl_str_mv |
Tolós Rigueiro, Laura Polls Martí, Artur Ramos Gómez, Àngels Schaffner-Bielich, Jürgen |
| author |
Tolós Rigueiro, Laura |
| author_facet |
Tolós Rigueiro, Laura Polls Martí, Artur Ramos Gómez, Àngels Schaffner-Bielich, Jürgen |
| author_role |
author |
| author2 |
Polls Martí, Artur Ramos Gómez, Àngels Schaffner-Bielich, Jürgen |
| author2_role |
author author author |
| dc.subject.none.fl_str_mv |
Reaccions nuclears Constitució de la matèria Col·lisions (Física nuclear) Nuclear reactions Constitution of matter Collisions (Nuclear physics) |
| topic |
Reaccions nuclears Constitució de la matèria Col·lisions (Física nuclear) Nuclear reactions Constitution of matter Collisions (Nuclear physics) |
| description |
The $K^-/K^+$ ratio produced in heavy-ion collisions at GSI energies is studied. The in-medium properties at finite temperature of the hadrons involved are included, paying a special attention to the in-medium properties of antikaons. Using a statistical approach, it is found that the determination of the temperature and chemical potential at freeze-out conditions compatible with the ratio $K^-/K^+$ is very delicate, and depends very strongly on the approximation adopted for the antikaon self-energy. The use of an energy dependent $\bar{K}$ spectral density, including both s and p-wave components of the $\bar{K}N$ interaction, lowers substantially the freeze-out temperature compared to the standard simplified mean-field treatment and gives rise to an overabundance of $K^-$ production in the dense and hot medium. Even a moderately attractive antikaon-nucleus potential obtained from our self-consistent many-body calculation does reproduce the ``broad-band equilibration'' advocated by Brown, Rho and Song due to the additional strength of the spectral function of the $K^-$ at low energies |
| publishDate |
2003 |
| dc.date.none.fl_str_mv |
2003 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| format |
article |
| status_str |
publishedVersion |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2445/11005 |
| url |
https://hdl.handle.net/2445/11005 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevC.68.024903 Physical Review C, 2003, vol. 68, núm. 2, p. 024903-1, 024903-11 http://doi.org/10.1103/PhysRevC.68.024903 |
| dc.rights.none.fl_str_mv |
(c) The American Physical Society, 2003 info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
(c) The American Physical Society, 2003 |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
The American Physical Society |
| publisher.none.fl_str_mv |
The American Physical Society |
| dc.source.none.fl_str_mv |
Articles publicats en revistes (Física Quàntica i Astrofísica) reponame:Dipòsit Digital de la UB instname:Universidad de Barcelona |
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Universidad de Barcelona |
| reponame_str |
Dipòsit Digital de la UB |
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Dipòsit Digital de la UB |
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1869413418047373312 |
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15,300724 |