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Lévy-stable two-pion Bose-Einstein correlations in sNN=200 GeV Au+Au collisions
- Source :
- Physical Review C. 97
- Publication Year :
- 2018
- Publisher :
- American Physical Society (APS), 2018.
-
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 Levy-stable source distributions. Using a fine transverse momentum binning, we extract the correlation strength parameter λ, the Levy index of stability α, and the Levy 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 Levy-stable source functions. The λ(mT) measurements indicate a decrease of the strength of the correlations at low mT. The Levy length scale parameter R(mT) decreases with increasing mT, following a hydrodynamically predicted type of scaling behavior. The values of the Levy 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.
- Subjects :
- Length scale
Physics
Particle physics
010308 nuclear & particles physics
Bose–Einstein correlations
01 natural sciences
Nuclear physics
Pion
Critical point (thermodynamics)
0103 physical sciences
Quark–gluon plasma
Transverse mass
Nuclear Experiment
010306 general physics
Relativistic Heavy Ion Collider
Scaling
Subjects
Details
- ISSN :
- 24699993 and 24699985
- Volume :
- 97
- Database :
- OpenAIRE
- Journal :
- Physical Review C
- Accession number :
- edsair.doi...........7b462f1d543f250f29c004a4a7da6a55