Separate freeze-out of strange particles and the quark-hadron phase transition
The scenario of the independent chemical freeze-outs for strange and nonstrange particles is discussed. Within such a scenario an apparent in-equilibrium of strangeness is naturally explained by a separation of chemical freeze-out of strange hadrons from the one of non-strange hadrons, which, nevert...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2018-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://doi.org/10.1051/epjconf/201818202057 |
| _version_ | 1818655727716139008 |
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| author | Bugaev K. Sagun V. Ivanytskyi A. Nikonov E. Cleymans J. Mishustin I. Zinovjev G. Bravina L.V. Zabrodin E.E. |
| author_facet | Bugaev K. Sagun V. Ivanytskyi A. Nikonov E. Cleymans J. Mishustin I. Zinovjev G. Bravina L.V. Zabrodin E.E. |
| author_sort | Bugaev K. |
| collection | DOAJ |
| description | The scenario of the independent chemical freeze-outs for strange and nonstrange particles is discussed. Within such a scenario an apparent in-equilibrium of strangeness is naturally explained by a separation of chemical freeze-out of strange hadrons from the one of non-strange hadrons, which, nevertheless, are connected by the conservation laws of entropy, baryonic charge and third isospin projection. An interplay between the separate freeze-out of strangeness and its residual non-equilibrium is studied within an elaborate version of the hadron resonance gas model. The developed model enables us to perform a high-quality fit of the hadron multiplicity ratios measured at AGS, SPS and RHIC with an overall fit quality ϰ2/dof = 0:93. A special attention is paid to a description of the Strangeness Horn and to the well-known problem of selective suppression of Δ- and ж hyperons. It is remarkable that for all collision energies the strangeness suppression factor γs is about 1 within the error bars. The only exception is found in the vicinity of the center-of-mass collision energy 7.6 GeV, at which a residual enhancement of strangeness of about 20 % is observed. |
| first_indexed | 2024-12-17T03:14:17Z |
| format | Article |
| id | doaj.art-5b4d4c147df64c3aba3c9dfa856c8483 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-17T03:14:17Z |
| publishDate | 2018-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-5b4d4c147df64c3aba3c9dfa856c84832022-12-21T22:05:44ZengEDP SciencesEPJ Web of Conferences2100-014X2018-01-011820205710.1051/epjconf/201818202057epjconf_icnfp2018_02057Separate freeze-out of strange particles and the quark-hadron phase transitionBugaev K.Sagun V.Ivanytskyi A.Nikonov E.Cleymans J.Mishustin I.Zinovjev G.Bravina L.V.Zabrodin E.E.The scenario of the independent chemical freeze-outs for strange and nonstrange particles is discussed. Within such a scenario an apparent in-equilibrium of strangeness is naturally explained by a separation of chemical freeze-out of strange hadrons from the one of non-strange hadrons, which, nevertheless, are connected by the conservation laws of entropy, baryonic charge and third isospin projection. An interplay between the separate freeze-out of strangeness and its residual non-equilibrium is studied within an elaborate version of the hadron resonance gas model. The developed model enables us to perform a high-quality fit of the hadron multiplicity ratios measured at AGS, SPS and RHIC with an overall fit quality ϰ2/dof = 0:93. A special attention is paid to a description of the Strangeness Horn and to the well-known problem of selective suppression of Δ- and ж hyperons. It is remarkable that for all collision energies the strangeness suppression factor γs is about 1 within the error bars. The only exception is found in the vicinity of the center-of-mass collision energy 7.6 GeV, at which a residual enhancement of strangeness of about 20 % is observed.https://doi.org/10.1051/epjconf/201818202057 |
| spellingShingle | Bugaev K. Sagun V. Ivanytskyi A. Nikonov E. Cleymans J. Mishustin I. Zinovjev G. Bravina L.V. Zabrodin E.E. Separate freeze-out of strange particles and the quark-hadron phase transition EPJ Web of Conferences |
| title | Separate freeze-out of strange particles and the quark-hadron phase transition |
| title_full | Separate freeze-out of strange particles and the quark-hadron phase transition |
| title_fullStr | Separate freeze-out of strange particles and the quark-hadron phase transition |
| title_full_unstemmed | Separate freeze-out of strange particles and the quark-hadron phase transition |
| title_short | Separate freeze-out of strange particles and the quark-hadron phase transition |
| title_sort | separate freeze out of strange particles and the quark hadron phase transition |
| url | https://doi.org/10.1051/epjconf/201818202057 |
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