Soft/hard boundary?

• At SPS ( )

  • Hydrodynamic models.
  • pQCD(X.N.Wang, hep-ph/9804357)
  • at SPS : both works.
  • Small jet cross-section, measure only to

• At RHIC ( )

  • increase , larger jet cross-section,measure to high pt ( ).
  • Angular correlation

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