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HBT Radii and Space-Momentum Correlation at RHIC

HBT Radii and Space-Momentum Correlation at RHIC. Jingbo Zhang Department of Physics, Harbin Institute of Technology July 11, 2008 @ Hefei. P. (. k. ,. k. ). =. 2. 1. 2. C. (. k. ,. k. ). 1. 2. P. (. k. ). P. (. k. ). 1. 1. 1. 2. P. (. k. ,. k. ). :. two.

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HBT Radii and Space-Momentum Correlation at RHIC

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  1. HBT Radii and Space-Momentum Correlation at RHIC Jingbo Zhang Department of Physics, Harbin Institute of Technology July 11, 2008 @ Hefei

  2. P ( k , k ) = 2 1 2 C ( k , k ) 1 2 P ( k ) P ( k ) 1 1 1 2 P ( k , k ) : two particle distributi on, P ( k ) : single particle distributi on 2 1 2 1 1 Two particle correlation function HBT effect uses to find the size of the fireball from a measurement of two particle correlation function.

  3. Transverse mass dependence: Au+Au LPSW(05) - DATA in color-- experimentalist’s plot

  4. Transverse mass dependence: elementary collisions DELPHI - e+e- annihilation mT dependencein elementary collisions (e.g. OPAL, DELPHI, E735) usually attributed to • String fragmentation • Resonance contribution • Heisenberg uncertainty G. Alexander, hep-ph/0302130

  5. Transverse mass dependence: p+p p+p: HBT radii decrease with increase of mT STAR data • flow not expected in such a small system as p+p Shuryak: hep-ph/0405066 • mT dependence of HBT radii in pp is not generated by the transverse flow, but by the transverse temperature inhomegeneities of hadron-hadron collisions due to the freezing scale –Csorgo et al.: hep-ph/0406042

  6. Surprising Scaling All pT(mT) dependences of HBT radii observed bySTAR scale with pp although it’s expected that different origins drivethese dependences

  7. RQMD + Correlation after a burner

  8. mt-dependence due to collective flow? or space-momentum correlation?

  9. Single-particle mt-spectra

  10. Slope Parameter

  11. Radial Expansion Velocity

  12. Single-particle mt-spectra II

  13. HBT Radii without SMC

  14. Summary • The mt-dependence of HBT appears in both heavy-ion and elementary collisions • The different mechanism may drive such a dependence. • However, it can be considered as a universal reason: space-momentum correlation. • The “surprising scaling” of HBT radii suggests that the SMC should be studied in detailed.

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