Mattione Update 10242011

Procedure

• Fit David's γ σ_t Improvement: Make dE, θ map
• Fit the π^- BCAL σ_t vs θ in dE bins, will apply improvement % to this resolution.
• Generate, simulate, smear, and reconstruct X(2000) -> b1π events
  • For 1234 Segmentation, disabled BCAL hit t-smear in mc_smear, smear reconstructed shower time as a function of dE & &theta during reconstruction to reach improved resolution.
    • Proton, π⁺'s, π^-'s all smeared the same.
• Plot Δβ vs p for π⁺ candidates to see proton, π⁺ separation.

David's BCAL Photon Time Resolution Studies

• γ BCAL σ_t vs. dE (GeV):

Time Resolution Segmentation Ratio

• γ BCAL σ_{t_1234} / σ_{t_334} vs. dE (GeV):

• Fits to γ BCAL σ_{t_1234} / σ_{t_334} vs. θ in dE bins:
• Don't trust fits at low-θ, so linearly-interpolate between 12 and 16 degrees.

BCAL π^- 334 Segmentation σ_t Fits

• BCAL π^- 334 Segmentation σ_t Fits vs. θ in dE bins:

X(2000) -> b1pi Events, π⁺ BCAL Δβ vs p

Δβ = β_p - β_t = p/sqrt(p*p + m*m) - path/(c*TOF)

• X(2000) -> b1pi Events, π⁺ BCAL Δβ vs p, 334 Segmentation:

• X(2000) -> b1pi Events, π⁺ BCAL Δβ vs p, 1234 Segmentation: