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In-depth Analysis of HCBC and TOF Elastic Data: Timing Offsets and Yield Comparisons

This analysis discusses the findings from various elastic scattering experiments conducted in April and December. Key focus areas include timing offsets, yield comparisons, and the methodology used for extracting position offsets with wire chambers. The study emphasizes the importance of improving resolution through better re-timing methods, particularly analyzing the stability of flasher functions over time. With a significant increase in dataset density and a reduction in projected errors, this work aims to enhance the understanding of particle interactions and refine experimental techniques.

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In-depth Analysis of HCBC and TOF Elastic Data: Timing Offsets and Yield Comparisons

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Presentation Transcript

  1. H(e,e’p) Analysis Chris Crawford Blast Analysis Meeting 2004/09/24

  2. elastic cuts Helastic based on Dec out-bending Hcbc – wire chambers for April in-bending data Hpt – TOF elastic new timing offsets for Feb,April data background comparison of yields TOF only, WC AL,R, m GE/GM , PbPt projected errors Outline

  3. Hcbc – Wire Chambers • [p,q,f,z]e, [p,q,f,z]p)q,f,z (5 extras) • pe:qe pp:qpqe:qpfe:fp ze:zp pmiss • need better resolution (current re-crunch)

  4. Timing Offsets • flasher unstable for April runs • retiming method • refit flasher peaks • aligned elastic timing peak in sets of 5k events • overall relative offsets from cosmics • use WC f to extract position offsets, slope

  5. secondary peak

  6. Hpt TOF elastic cuts • cut on 48 TOF paddle combinations/side • fit (ptr+ptl):(ttr-ttl) to 2-d gaussian • elliptical cuts with parameter ns

  7. Background Comparison background (%) # events/C • Helastic • Hcbc • Hpt

  8. Yields Comparison • TOF cuts only (lr ntuple) • MC includes WC acceptance (see forward paddles)

  9. Super-ratio Method 2 equations in P, R for fixed bin j independent polarization in each bin! 2n parameters Pj, Rj Global Fit Method fit ALj, ARj to above formalism with P, Rj n+1 parameters n+2 (+spin angle?) same advantage as super-ratio method PbPt still cancels i = left,right j = Q2 bin (1..n) b = spin angle Fit Method

  10. Outbending Data (Dec)

  11. Inbending Data(Feb, Apr)

  12. Combined Datasets with Projected Errors • based on additional 325kC of data • 32% increase in density • 3.2£ reduction in errors compared with 50kC in April

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