What invariant one-particle multiplicity distributions and two-particle correlations are telling us about relativistic heavy-ion collisions

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The authors have used a nine-parameter expanding source model that includes special relativity, quantum statistics, resonance decays, and freeze-out on a realistic hypersurface in spacetime to analyze in detail invariant {pi}{sup +}, K{sup +}, and K{sup {minus}} one-particle multiplicity distributions and {pi}{sup +} and {pi}{sup {minus}} two-particle correlations in nearly central collisions of Pb + Pb at p{sub lab}/A = 158 GeV/c. These studies confirm an earlier conclusion for nearly central collisions of Si + Au at p{sub lab}/A = 14.6 GeV/c that the freeze-out temperature is less than 100 meV and that both the longitudinal and transverse collective velocities ... continued below

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11 p.

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Nix, J.R.; Strottman, D.; Hecke, H.W. van; Schlei, B.R.; Sullivan, J.P. & Murray, M.J. February 1, 1998.

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The authors have used a nine-parameter expanding source model that includes special relativity, quantum statistics, resonance decays, and freeze-out on a realistic hypersurface in spacetime to analyze in detail invariant {pi}{sup +}, K{sup +}, and K{sup {minus}} one-particle multiplicity distributions and {pi}{sup +} and {pi}{sup {minus}} two-particle correlations in nearly central collisions of Pb + Pb at p{sub lab}/A = 158 GeV/c. These studies confirm an earlier conclusion for nearly central collisions of Si + Au at p{sub lab}/A = 14.6 GeV/c that the freeze-out temperature is less than 100 meV and that both the longitudinal and transverse collective velocities -- which are anti-correlated with the temperature -- are substantial. The authors also reconciled their current results with those of previous analyses that yielded a much higher freeze-out temperature of approximately 140 meV for both Pb + Pb collisions at p{sub lab}/A = 158 GeV/c and other reactions. One type of analysis was based upon the use of a heuristic equation that neglects relativity to extrapolate slope parameters to zero particle mass. Another type of analysis utilized a thermal model in which there was an accumulation of effects from several approximations. The future should witness the arrival of much new data on invariant one-particle multiplicity distributions and two-particle correlations as functions of bombarding energy and/or size of the colliding nuclei. The proper analysis of these data in terms of a realistic model could yield accurate values for the density, temperature, collective velocity, size, and other properties of the expanding matter as it freezes out into a collection of noninteracting hadrons. A sharp discontinuity in the value of one or more of these properties could conceivably be the long-awaited signal for the formation of a quark-gluon plasma or other new physics.

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11 p.

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INIS; OSTI as DE98005645

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  • 14. winter workshop on nuclear dynamics, Snowbird, UT (United States), 1-7 Feb 1998

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  • Other: DE98005645
  • Report No.: LA-UR--98-170
  • Report No.: CONF-980239--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 672054
  • Archival Resource Key: ark:/67531/metadc708945

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  • February 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • March 2, 2016, 1:01 p.m.

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Nix, J.R.; Strottman, D.; Hecke, H.W. van; Schlei, B.R.; Sullivan, J.P. & Murray, M.J. What invariant one-particle multiplicity distributions and two-particle correlations are telling us about relativistic heavy-ion collisions, article, February 1, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc708945/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.