Lévy-stable two-pion Bose-Einstein correlations in root(s)NN = 200 GeV Au+Au collisions

Adare, A. and Makek, Mihael and Zou, L. (PHENIX Collaboration) (2018) Lévy-stable two-pion Bose-Einstein correlations in root(s)NN = 200 GeV Au+Au collisions. Physical Review C, 97 (6). pp. 64911-22. ISSN 2469-9985

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Abstract

We present a detailed measurement of charged two- pion correlation functions in 0–30% centrality sNN=200 GeV Au+Au collisions by the PHENIX experiment at the Relativistic Heavy Ion Collider. The data are well described by Bose- Einstein correlation functions stemming from Lévy-stable source distributions. Using a fine transverse momentum binning, we extract the correlation strength parameter λ, the Lévy index of stability α, and the Lévy length scale parameter R as a function of average transverse mass of the pair mT. We find that the positively and the negatively charged pion pairs yield consistent results, and their correlation functions are represented, within uncertainties, by the same Lévy-stable source functions. The λ(mT) measurements indicate a decrease of the strength of the correlations at low mT. The Lévy length scale parameter R(mT) decreases with increasing mT, following a hydrodynamically predicted type of scaling behavior. The values of the Lévy index of stability α are found to be significantly lower than the Gaussian case of α=2, but also significantly larger than the conjectured value that may characterize the critical point of a second-order quark-hadron phase transition.

Item Type: Article
Keywords: Bose-Einstein correlations ; Quark-gluon plasma ; Au+Au collisions ; 200 GeV ; PHENIX, RHIC
Date: 14 June 2018
Number of Pages: 22
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2018 American Physical Society. Received 19 September 2017; published 14 June 2018.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 16 Jul 2018 09:00
Last Modified: 16 Jul 2018 09:02
URI: http://digre.pmf.unizg.hr/id/eprint/5829

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