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Separate freeze-out of strange particles and the quark-hadron phase transitionстатья Исследовательская статья
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 5 декабря 2018 г.
- Авторы: Bugaev K., Sagun V., Ivanytskyi A., Nikonov E., Cleymans J., Mishustin I., Zinovjev G., Bravina L.V., Zabrodin E.E.
- Журнал: EPJ Web of Conferences
- Том: 182
- Год издания: 2018
- Первая страница: 02057
- DOI: 10.1051/epjconf/201818202057
- Аннотация: 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.
- Добавил в систему: Забродин Евгений Евгеньевич