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Title: Correspondence between Hanbury-Brown-Twiss radii and the emission zone in noncentral heavy ion collisions

Abstract

In noncentral collisions between ultrarelativistic heavy ions, the freeze-out distribution is anisotropic, and its major longitudinal axis may be tilted away from the beam direction. The shape and orientation of this distribution are particularly interesting, as they provide a snapshot of the evolving source and reflect the space-time aspect of anisotropic flow. Experimentally, this information is extracted by measuring pion Hanbury-Brown-Twiss (HBT) radii as a function of angle with respect to the reaction plane. The connection between measured radius oscillations and the underlying geometry is necessarily model-dependent; many existing formulas are strictly valid only for Gaussian sources with no collective flow. With a realistic transport model of the collision, which generates flow and non-Gaussian sources, we find that these formulas approximately reflect the anisotropy of the freeze-out distribution.

Authors:
;  [1]; ;  [2];  [2]
  1. Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States)
  2. Frankfurt Institute for Advanced Studies, Frankfurt am Main (Germany)
Publication Date:
OSTI Identifier:
21596605
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.84.014908; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ANISOTROPY; COLLISIONS; DISTRIBUTION; EMISSION; HEAVY ION REACTIONS; HEAVY IONS; OSCILLATIONS; PIONS; RELATIVISTIC RANGE; SPACE-TIME; TRANSPORT THEORY; BOSONS; CHARGED PARTICLES; ELEMENTARY PARTICLES; ENERGY RANGE; HADRONS; IONS; MESONS; NUCLEAR REACTIONS; PSEUDOSCALAR MESONS

Citation Formats

Mount, E, Lisa, M A, Graef, G, Bleicher, M, Institut fuer Theoretische Physik, Goethe-Universitaet, Frankfurt am Main, and Mitrovski, M. Correspondence between Hanbury-Brown-Twiss radii and the emission zone in noncentral heavy ion collisions. United States: N. p., 2011. Web. doi:10.1103/PHYSREVC.84.014908.
Mount, E, Lisa, M A, Graef, G, Bleicher, M, Institut fuer Theoretische Physik, Goethe-Universitaet, Frankfurt am Main, & Mitrovski, M. Correspondence between Hanbury-Brown-Twiss radii and the emission zone in noncentral heavy ion collisions. United States. doi:10.1103/PHYSREVC.84.014908.
Mount, E, Lisa, M A, Graef, G, Bleicher, M, Institut fuer Theoretische Physik, Goethe-Universitaet, Frankfurt am Main, and Mitrovski, M. Fri . "Correspondence between Hanbury-Brown-Twiss radii and the emission zone in noncentral heavy ion collisions". United States. doi:10.1103/PHYSREVC.84.014908.
@article{osti_21596605,
title = {Correspondence between Hanbury-Brown-Twiss radii and the emission zone in noncentral heavy ion collisions},
author = {Mount, E and Lisa, M A and Graef, G and Bleicher, M and Institut fuer Theoretische Physik, Goethe-Universitaet, Frankfurt am Main and Mitrovski, M},
abstractNote = {In noncentral collisions between ultrarelativistic heavy ions, the freeze-out distribution is anisotropic, and its major longitudinal axis may be tilted away from the beam direction. The shape and orientation of this distribution are particularly interesting, as they provide a snapshot of the evolving source and reflect the space-time aspect of anisotropic flow. Experimentally, this information is extracted by measuring pion Hanbury-Brown-Twiss (HBT) radii as a function of angle with respect to the reaction plane. The connection between measured radius oscillations and the underlying geometry is necessarily model-dependent; many existing formulas are strictly valid only for Gaussian sources with no collective flow. With a realistic transport model of the collision, which generates flow and non-Gaussian sources, we find that these formulas approximately reflect the anisotropy of the freeze-out distribution.},
doi = {10.1103/PHYSREVC.84.014908},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 1,
volume = 84,
place = {United States},
year = {2011},
month = {7}
}