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SUMMARY:A SPECIFIC HEAT OF NUCLEAR MEDIUM  PROBED BY $K_S^0$ MESONS PRODUC
 ED  IN $Au+Au$ COLLISIONS AT RHIC
DTSTART;VALUE=DATE-TIME:20220713T130000Z
DTEND;VALUE=DATE-TIME:20220713T132000Z
DTSTAMP;VALUE=DATE-TIME:20260608T121740Z
UID:indico-contribution-553@events.sinp.msu.ru
DESCRIPTION:Speakers: Mikhail Tokarev (Join Institute for Nuclear Research
 )\nThe data [1] on spectra of $K_S^0$ mesons measured by the STAR Collabor
 ation in Au+Au collisions at various centralities characterized by differe
 nt multiplicity densities of negative particles were analyzed in the $z$-s
 caling approach [2\,3]. The transverse momentum distributions obtained in 
 the BES-I program at RHIC were accumulated in seven centrality classes fro
 m the most central 0-5% to peripheral 60-80% collisions in the rapidity ra
 nge $|y|<0.5$. These data and the earlier STAR data at $\\sqrt {s_{NN}}=$ 
 62\, 130 and 200 GeV allow us a detail study of the energy and centrality 
 dependence of $K_S^0$-meson production in a wide range of $\\sqrt {s_{NN}}
 =$ 7.7–200 GeV.\nThe scaling function $\\psi(z)$ was constructed and the
  self-similarity of $K_S^0$-meson production was confirmed. It was found t
 hat the model parameter $c_{AuAu}$ interpreted as a specific heat of produ
 ced medium depends on collision energy. The scaling behavior is consistent
  with an abrupt decrease of $c_{AuAu}$ from the value of 0.16 at $\\sqrt {
 s_{NN}}=$ 7.7 and 11.5 GeV to about 0.09 at the top RHIC energy. At $\\sqr
 t {s_{NN}}=$39 GeV\, a kink in the significant drop of this parameter is o
 bserved\, as well as an indication of its flattening at higher $\\sqrt {s_
 {NN}}$. The non-trivial dependence of $c_{AuAu}$  on the collision energy 
 obtained from the $z$-scaling of $K_S^0$-meson production shows that the s
 trange probe is much more sensitive to properties of nuclear medium than a
  non-identified negative hadron [3]. The irregularities in the behavior of
  the specific heat parameter cAuAu could indicate existence of a phase tra
 nsition in nuclear matter.\n\n1. J. Adam et al. (STAR Collaboration)\, Phy
 s. Rev. C 102\, 034909 (2020).\n2. M. Tokarev et al.\, Phys. Part. Nucl. 5
 1\, 141 (2020).\n3. M. Tokarev\, A. Kechechyan\, I. Zborovský\, Nucl. Phy
 s. A 993\, 121646 (2020).\n\nhttps://events.sinp.msu.ru/event/8/contributi
 ons/553/
LOCATION: НИИЯФ\, ЮК\, ауд. 3-13
URL:https://events.sinp.msu.ru/event/8/contributions/553/
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