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Nuclear Transparency in Exclusive r 0 Production at HERMES

Nuclear Transparency in Exclusive r 0 Production at HERMES. W. Lorenzon (Michigan) Collaboration. Introduction Diffractive r 0 production Nuclear Effects b N (Q 2 ) variation ( g shrinkage) coherent/incoherent cross section ratios l c -dependence

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Nuclear Transparency in Exclusive r 0 Production at HERMES

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  1. Nuclear Transparency in Exclusive r0 Production at HERMES W. Lorenzon (Michigan) Collaboration • Introduction • Diffractive r0 production • Nuclear Effects • bN(Q2) variation (g shrinkage) • coherent/incoherent cross section ratios • lc-dependence • Q2-dependence (Color Transparency) • Summary

  2. HERMES Experiment at HERA (2003)

  3. The HERMES Detector

  4. Exclusive Diffractive r0 Electroproduction

  5. Evolution of Virtual Quantum States

  6. Color Transparency

  7. “Charge Screening” Ionization

  8. Color Transparency in A(p,2p) – BNL Results

  9. Color Transparency in A(e,e’p) – SLAC/JLab Results

  10. Color Transparency in A(m,m’r0) – FNAL Results

  11. Color Transparency in A(p,di-jet) – FNAL Results

  12. Color Transparency

  13. Color Transparency and r0 Leptoproduction

  14. Exclusive Diffractive r0

  15. t’ Distributions

  16. Size of Nuclei

  17. bN (Q2) –“Photon Shrinkage”

  18. Q2 dependence of scoh / sincoh

  19. Coherence Length Dependence of ISI

  20. Incoherent Nuclear Transparency TA

  21. Coherence Length Effects

  22. HERMES acceptance in Q2 vs lc

  23. Color Transparency

  24. Summary

  25. A and Q2 dependence of scoh / sincoh

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