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Peter Christiansen Profile

Peter Christiansen

Professor

Peter Christiansen Profile

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

Author

  • A. Adare
  • C. Aidala
  • N. N. Ajitanand
  • Y. Akiba
  • R. Akimoto
  • J J Alexander
  • Peter Christiansen
  • Hans-Åke Gustafsson
  • Eva Haslum
  • Anders Oskarsson
  • David Silvermyr
  • Evert Stenlund
Show all

Summary, in English

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. © 2018 American Physical Society.

Department/s

  • eSSENCE: The e-Science Collaboration
  • Particle and nuclear physics
  • Department of Physics

Publishing year

2018

Language

English

Publication/Series

Physical Review C

Volume

97

Issue

6

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 2469-9985