Abstract
Negative particle yields in Au + Au collisions obtained by the STAR Collaboration from BES-I at RHIC are analyzed in the framework of the z-scaling approach. The spectra were measured over a wide range of collision energy $\sqrt {{s_{NN}}} = 7.7 - 200\,{\rm{GeV}}$ and transverse momentum of produced particles for different centralities at $\left| \eta \right| \lt 0.5$. The scaling behavior of the spectra as a function of the collision energy and centrality in z-presentation is verified. The constituent energy loss in dependence on the energy and centrality of collision and transverse momentum of inclusive particle is estimated. New indication on self-similarity of fractal structure of nuclei and fragmentation process is found. A discontinuity of the model parameters - fractal and fragmentation dimensions and specific heat - is considered from the point of view of a phase transition in nuclear matter.
Highlights
Experimental results obtained at RHIC support the hypothesis that a strongly-coupled nuclear medium with parton degrees of freedom, namely in heavy-ion collisions in the high energy region t√hesNQNua=rk6-2Gl−uo2n00PlGasemVa[1(Q–3G]P. )A, ims ocnregatthede properties of the new medium there is opacity characterized by the suppression of particle yields and viscosity which is found to be such small that the matter looks like an ideal liquid rather than a gas of free quarks and gluons
The determination of features of the phase diagram of nuclear matter created at various temperatures and energy densities is one of the main goals of investigation performed in the heavy ion program at RHIC
In the paper we present new results of analysis of the Beam Energy Scan (BES)-I STAR data on spectra of negative hadrons produced in Au + Au collisions [5]
Summary
Experimental results obtained at RHIC support the hypothesis that a strongly-coupled nuclear medium with parton degrees of freedom, namely in heavy-ion collisions in the high energy region t√hesNQNua=rk6-2Gl−uo2n00PlGasemVa[1(Q–3G]P. )A, ims ocnregatthede properties of the new medium there is opacity characterized by the suppression of particle yields and viscosity which is found to be such small that the matter looks like an ideal liquid rather than a gas of free quarks and gluons. Experimental results obtained at RHIC support the hypothesis that a strongly-coupled nuclear medium with parton degrees of freedom, namely in heavy-ion collisions in the high energy region t√hesNQNua=rk6-2Gl−uo2n00PlGasemVa[1(Q–3G]P. The determination of features of the phase diagram of nuclear matter created at various temperatures and energy densities is one of the main goals of investigation performed in the heavy ion program at RHIC. In the paper we present new results of analysis of the BES-I STAR data on spectra of negative hadrons produced in Au + Au collisions [5]. The scaling properties of the data z-presentation and the characteristics of the constituent subprocess (momentum fractions, recoil mass and energy loss) are studied in dependence on the energy and centrality of collisions
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