Speaker
Description
The multiplicities of light (anti)nuclei were measured recently by the ALICE collaboration in Pb+Pb collisions at the center-of-mass collision energy $\sqrt{s} =2.76$ TeV [1]. Surprisingly, the hadron resonance gas model (HRGM) is able to perfectly describe the their multiplicities [2] under various assumptions. For instance, one can consider the (anti)nuclei with a vanishing hard-core radius (as the point-like particles) or with the hard-core radius of proton, but the fit quality is the same for these assumptions. However, it is clear that the hard-core radius of a nuclei consisting of A baryons or antibaryons must be give by the expression $R(A) = R(1) A^\frac{1}{3}$. To implement such a relation into the HRMG we employ the induced surface tension concept [3] and perform a thorough analysis of hadronic and (anti)nuclei multiplicities measured by the ALICE collaboration. The HRGM with the induced surface tension allows us to verify different assumptions on the values of hard-core radii and different scenarios of chemical freeze-out of (anti)nuclei. It is shown that the most successful description of hadrons can be achieved at the chemical freeze-out temperature $T_h=150$ MeV, while the one for all (anti)nuclei is $T_A=168$ MeV. Possible explanations of this very high temperature of (anti)nuclei chemical freeze-out are discussed.
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J. Adam et al. [ALICE Collaboration], Phys. Rev. C 93, no. 2, 024917 (2016).
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K. A. Bugaev, V. V. Sagun, A. I. Ivanytskyi, I. P. Yakimenko, E. G. Nikonov, A.V. Taranenko and G. M. Zinovjev, Nucl. Phys. A 970, 133 (2018).
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V. V. Sagun, K. A. Bugaev, A. I. Ivanytskyi, I. P. Yakimenko, E. G. Nikonov, A.V. Taranenko, C. Greiner, D. B. Blaschke and G. M. Zinovjev, Eur. Phys. J. A 54, 100 (2018).
