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Some Attempts to The Separation of Coherent and Incoherent ψ Production

Some Attempts to The Separation of Coherent and Incoherent ψ Production. Po-Ju Lin August 3,2004. Contents. Coherent – Incoherent - definition - t-dependence ν- correlation The mysterious band t and t_LD2/t_LH2 distribution Summary.

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Some Attempts to The Separation of Coherent and Incoherent ψ Production

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  1. Some Attempts to The Separation of Coherent and Incoherent ψ Production Po-Ju Lin August 3,2004

  2. Contents • Coherent – Incoherent - definition - t-dependence • ν- correlation • The mysterious band • t and t_LD2/t_LH2 distribution • Summary

  3. 1. Coherent - Incoherent • Definition • Coherent ψ production : The incoming photons interact with nucleus as a whole. • Incoherent ψ production : Photons penetrate into nucleus and interact with nucleon i.e. proton.

  4. 1. Coherent - Incoherent • Characteristic t-dependence Due to the resolving ability of particles exchanged: • High-| t | region: Incoherent process dominates • Low-| t | region: Coherent process dominates

  5. 1. Coherent - Incoherent • Our goal is to separate coherent and incoherent event from LD2 data • We use LH2 data as pure incoherent sample to make comparison

  6. Distribution Diagrams of LD2 and LH2 Data

  7. Incoherent vs. Coherent Plot of LD2 and LH2

  8. Comparison of LD2 and LH2 Distribution for coherent and incoherent events.

  9. 2. Correlation between Energy Transfer and Three Momentum Transfer • From the conservation of four momentum, we acquire this correlation: Where = energy transfer = three momentum transfer = nucleus mass = proton mass

  10. ν vs. Distribution Plots for LD2

  11. ν vs. Distribution Plots for LH2

  12. Step Zoom In step size: = 0.2 = 0.1

  13. 3. The Mysterious band • The band above the incoherent interaction line in both LD2 and LH2 diagrams. • Property analysis • Colliding mass : direct fit from diagram using correlation formula. • Missing mass

  14. Colliding-Mass of The Mysterious Band

  15. Missing Mass of The Mysterious Band Figure 1 - LD2 Figure 2 - LH2

  16. 4. Momentum Transfer t for LD2 and LH2

  17. t_LD2/t_LH2 Ratio Plot

  18. Photon-energy vs. t for LD2 and LH2

  19. t_LD2/t/LH2 plots for Different Photon Energy Bin Bin size : 0.2 E-gamma :1.5 ~ 2.5

  20. Overlapped t_LD2/t_LH2 of Different Photon Energy Bin Figure 3 – original scaleFigure 4 – Zoom in

  21. Summary • No really useful present method can efficiently separate coherent and incoherent events.

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