Evidence of the mixed phase formation in nucleus-nucleus collisions
| Autor: | Sagun, V. V., Bugaev, K. A., Ivanytskyi, A. I., Oliinychenko, D. R. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | WDS`16 Proceedings of Contributed Papers Physics (eds. J. Safrankova and J. P avlu), Prague, Matfyzpress, pp. 53-58 (2016) |
| Druh dokumentu: | Working Paper |
| Popis: | Searchers for various irregularities in the behavior of thermodynamic quantities at chemical freeze-out (CFO) are rather important in a view of experimental studies of quark-gluon plasma (QGP). Using the multicomponent hadron resonance gas model (HRGM), developed in (Sagun, 2014; Bugaev et al., 2015), we performed a high-quality fit of 111 hadronic ratios measured for 14 values of the center of mass collision energies between 2.7 GeV and 200 GeV with the overall fit quality $\chi^2/dof \simeq 0.95$. In addition to previously reported singularities (Bugaev et al., 2015) at CFO we found that the hadron yield ratios $\frac{\Lambda}{p}$, $\frac{K^{+}}{p}$, $\frac{K^{+}}{\Lambda}$, $\frac{\Omega^{-}}{p}$ and $\frac{\Xi^{-}}{p}$ measured in central nuclear collisions demonstrate a significant change of slope in the same range of center of mass collision energy $\sqrt{s_{NN}} = 4.3-4.9$ GeV (Bugaev et al., 2015). This change of slopes is accompanied by a dramatic increase of resonance decays at CFO. Also at CFO the trace anomaly and baryonic density demonstrate the pronounced peaks at the collision energy $\sqrt{s_{NN}} = 4.9 $ GeV. We argue that all these and previously found irregularities provide an evidence for the QGP formation in nuclear collisions at about $\sqrt{s_{NN}} = 4.9 $ GeV. Comment: Proceedings of the Week of Doctoral Students (WDS) 2016 Conference, 6 pages, 4 figures |
| Databáze: | arXiv |
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