Journal
PHYSICS LETTERS B
Volume 845, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2023.138165
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This article reports the first measurement of density fluctuations near the QCD critical point in Au+Au collisions via an intermittency analysis. The results show a power-law behavior of scaled factorial moments and a decreasing scaling exponent v from peripheral to central collisions. The energy dependence of v exhibits a non-monotonic pattern, reaching a minimum at around root s(NN) = 27 GeV.
Density fluctuations near the QCD critical point can be probed via an intermittency analysis in relativistic heavy-ion collisions. We report the first measurement of intermittency in Au+Au collisions at root s(NN) = 7.7-200 GeV measured by the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The scaled factorial moments of identified charged hadrons are analyzed at mid-rapidity and within the transverse momentum phase space. We observe a power-law behavior of scaled factorial moments in Au+Au collisions and a decrease in the extracted scaling exponent (v) from peripheral to central collisions. The v is consistent with a constant for different collisions energies in the mid-central (10-40%) collisions. Moreover, the v in the 0-5% most central Au+Au collisions exhibits a non-monotonic energy dependence that reaches a minimum around root s(NN) = 27 GeV. The physics implications on the QCD phase structure are discussed. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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