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Measuring the Source “Size” (HBT). 1D: overall rough “size”. y 1. x 1. K . y 2. ~1 m. x 2. R out. R side. ~5 fm. 3D decomposition of relative momentum provides handle on shape and time as well as size. HBT and the Phase Transition. with transition. without transition. “ e ”.

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  1. Measuring the Source “Size” (HBT) 1D: overall rough “size” y1 x1 K y2 ~1 m x2 Rout Rside ~5 fm 3D decomposition of relative momentum provides handle on shape and time as well as size

  2. HBT and the Phase Transition with transition without transition “e” ec Generic prediction of 3D hydrodynamic models ~ emission timescale Rischke & Gyulassy NPA 608, 479 (1996) PrimaryHBT “signature” of QGP Phase transition  longer lifetime; Rout/Rside ~ 1 + (bt)/Rside

  3. Correlation function for identical bosons: 1d projections of 3d Bertsch-Pratt 12% most central out of 170k events Coulomb corrected |y| < 1, 0.125 < pt < 0.225 Two-particle interferometry (HBT) qout STAR preliminary qlong STAR preliminary

  4. Radii dependence on centrality and kt y (fm) x (fm) central collisions low kT p- p+ STAR preliminary • Radii increase with multiplicity - Just geometry (?) • Radii decrease with kt – Evidence of flow (?) “multiplicity”

  5. Pion HBT Excitation Function Compilation of world 3D -HBT parameters as a function of s STAR Preliminary • Central AuAu (PbPb) • Decreasing  parameter • Decreased correlation strength • More baryon resonances ? • Saturation in radii • Geometric or dynamic (thermal/flow) saturation • No jump in effective lifetime • No significant rise in size of the  emitting source • Lower energy running needed!

  6. The ROut/RSide Ratio Emission duration for transparent sources: STAR Preliminary Tomášik, Heinz nucl-th/9805016 =0.0 =0.5 opaqueness Small radii + short emission time + opaqueness short freeze-out

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