Updates to the p+p and A+A chemical freeze-out lines from the new experimental data

16th International Conference on Strangeness in Quark Matter

Begun, V.V.^1 ; Vovchenko, V.^2,3,4 ; Gorenstein, M.I.^2,5

Institute of Physics, Jan Kochanowski University, Kielce

PL-25406, Poland^1

Frankfurt Institute for Advanced Studies, Goethe Universität Frankfurt, Frankfurt am Main

D-60438, Germany^2

Institut für Theoretische Physik, Goethe Universität Frankfurt, Frankfurt am Main

D-60438, Germany^3

Department of Physics, Taras Shevchenko National University of Kiev, Kiev

03022, Ukraine^4

Bogolyubov Institute for Theoretical Physics, Kiev

03680, Ukraine^5

关键词: Beam energies;    Collision energies;    Deconfinement;    Freeze out;    System size;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/779/1/012080/pdf
DOI  :  10.1088/1742-6596/779/1/012080

来源: IOP

【 摘 要 】

We show that the new data on mean multiplicities measured in p+p and A+A collisions together with the updated list of resonances lead to the significant changes of the obtained freeze-out lines. The new A+A line gives much smaller temperatures at high collision energies and agrees with the values obtained at the LHC. The newly obtained p+p line is much closer to the A+A line than previously expected, and even touches it in the region where the K+/π+horn appears in the data. It indicates that the temperatures that will be obtained in the beam energy and system size scan by the NA61/SHINE Collaboration might be very close. However, our analysis shows that the chemical potentials could be very different for the same energies in A+A and p+p. It adds more puzzles to the set of surprising coincidences at the energies close to the possible onset of deconfinement.