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/).

Energy dependence of intermittency for charged hadrons in Au+Au collisions at RHIC

S. Fazio;
2023-01-01

Abstract

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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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/360956
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