Self-similarity of K.sub.S./sub..sup.0./sup.-meson production in Au plus Au collisions from BES-I at STAR and anomaly of 'specific heat' and entropy

0560215 - ÚJF 2023 RIV NL eng J - Journal Article
Tokarev, M. V. - Zborovský, Imrich
Self-similarity of K_S⁰-meson production in Au plus Au collisions from BES-I at STAR and anomaly of 'specific heat' and entropy.
Nuclear Physics. A. Roč. 1025, SEP (2022), č. článku 122492. ISSN 0375-9474. E-ISSN 1873-1554
R&D Projects: GA MŠMT LTT19005
Institutional support: RVO:61389005
Keywords : high energy * strange particle * scaling * energy loss * heat capacity * entropy
OECD category: Nuclear physics
Impact factor: 1.4, year: 2022
Method of publishing: Limited access
https://doi.org/10.1016/j.nuclphysa.2022.122492

We present results of analysis of K-S(0)-meson spectra in Au + Au collisions obtained by the STAR Collaboration in the first phase of the Beam Energy Scan program at RHIC using the z-scaling approach. The analyzed data on inclusive cross sections were measured over a wide range of collision energy root s(NN) = 7.7 - 200 GeV and transverse momentum of produced particles for different centralities in the rapidity range vertical bar y vertical bar < 0.5. A scaling behavior of the spectra in z-presentation is observed. The concept of the z-scaling is based on fundamental principles of self-similarity, locality, and fractality of hadron interactions at a constituent level. Structure of the colliding nuclei and fragmentation process in final state are described by fractal dimensions delta(A) and is an element of(AA), respectively. Produced medium is characterized by a 'specific heat' c(AA). Onset of constant delta(A), smooth increase of is an element of(AA) and anomalous behavior of c(AA) with collision energy in the scaling regime are observed. The self-similarity of fractal structure of nuclei and fragmentation processes with K-S(0) probe is demonstrated. The energy loss as a function of the collision energy, centrality and transverse momentum of the inclusive particle is estimated. An anomaly in the entropy behavior of system configurations in the region root s(NN) similar to 30 - 40 GeV at low pT in the central collisions is found. A possible signature of phase transition indicated by the peculiarities of specific heat and entropy as ingredients of the z-scaling of K-S(0)-meson production is discussed.
Permanent Link: https://hdl.handle.net/11104/0333224