Mattione Update 11072011

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Revision as of 12:57, 7 November 2011 by Pmatt (Talk | contribs) (Problems)

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Procedure

  • Reconstruct π(1600) -> b1π events with t-slope = 2.0 using both the 334 and 1234 segmentations
  • Plot Δβ vs p for π+ candidates to see proton, π+ separation.

π(1600) -> b1pi Events

p vs. θ

  • p vs. θ
    • NOTE: time improvement only at forward angles, so will be negligible for protons in this reaction.
π+'s
protons

π+ BCAL Δβ vs p

Δβ = βp - βt = p/sqrt(p*p + m*m) - path/(c*TOF)

334 Segmentation


  • π(1600) -> b1pi Events, π+ Candidates, BCAL Δβ vs p, 334 Segmentation
p = 1.2 GeV/c, 334 Segmentation
p = 1.4 GeV/c, 334 Segmentation
p = 1.5 GeV/c, 334 Segmentation
p = 1.6 GeV/c, 334 Segmentation

Problems

  • π+ Reconstructed BCAL Time Resolution
    • NOTE: The shower time was smeared by: σsmear = sqrt(σ2t_1234_Target - σ2t_334_NoSmear), where σt_1234_Target = σt_334*Improvement_Ratio, Improvement_Ratio = σt_1234 / σt_334
Mattione Update 11072011 BCALPiPlusSigmaTCompare Bin1.gif


Reference

  • Fit the results of David's study: Fit γ BCAL σt_1234 / σt_334 vs. θ in dE bins:
    • Don't trust fits at low-θ, so linearly-interpolate between 12 and 16 degrees.
Mattione Update 10312011 BCALPhotonTimeResolutionRatio Fits1.gif