Manifestation of Nuclear Effects in the Fractal Analysis AMPTA of AuAu Events at 200 GeV by the SePaC Method

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In this paper, the manifestation of nuclear effects in the fractal analysis of Monte Carlo AMPT AuAu events at an energy √ s_NN = 200 GeV was studied. The transverse momenta p_t of particles were analyzed by SePaC method in five centrality classes. It was established that the selected fractal events have a complex p_t spectrum, and the spectrum of non-fractal events can be fitted with an exponential function in the interval from 2 to 4 GeV/c and has the same slope for the events with a centrality of 0–30%. When final-state interaction and nuclear shadowing are turned off, spectrum slope constancy is violated. The generation of quark “back-to-back” jets increases the slope of the p_t spectrum of non-fractal events and the yield of hadrons in the region of 2.2–3.0 GeV/c in fractal events. The production of quark-antiquark jets accompanied by pions does not change the behavior of p_t spectra of fractal events but decreases the slope of the spectrum of non-fractal events in peripheral collisions.