Mattione Update 09212011

Summary

• OBJECTIVE: I'm updating the reconstruction uncertainties to improve the particle-ID algorithms and support the kinematic fitting analyses.

• PLAN: I'm comparing the generated and reconstructed track parameters in the TOF, BCAL, and FCAL systems to determine the uncertainties.

• STATUS: TOF Uncertainties are below.

TOF Time Uncertainty

π^- hits in both TOF planes

• Δt vs. x, y, average dE

Δt vs. x

Δt vs. y

Δt vs. avg. dE

• Fit the Δt distributions to Gaussian functions, σ_t's are fit below.

σ_t vs. x

σ_t vs. y

σ_t vs. avg. dE

π^- hit only in the horizontal plane

• Δt vs. x, y, dE

Δt vs. x

Δt vs. dE

• Fit the Δt distributions to Gaussian functions, σ_t's are fit below.

σ_t vs. x

σ_t vs. dE

π^- hit only in the vertical plane

• Δt vs. x, y, dE

Δt vs. y

Δt vs. dE

• Fit the Δt distributions to Gaussian functions, σ_t's are fit below.

σ_t vs. y

σ_t vs. dE

TOF Deposited Energy Uncertainty

π^- hits in both TOF planes

• ΔdE (Measured Average - Most Probable) vs. Most Probable (NOT True) dE

ΔdE vs. Most Probable dE

• ΔdE (Measured Average - Most Probable) vs. Measured Average dE

ΔdE vs. Measured Avg. dE

• Most probable deposited energy calculated via Equation 27.10 in Section 27.2.7 of the RPP.

• Perhaps the best way to do it is to look at the dE distribution as a function of track βγ, and get the uncertainty from the width of that distribution. How would the energy uncertainty be calibrated using real data?

TOF X Uncertainty

π^- hits in both TOF planes

• Δx vs. x

Δx vs. x

• Fit the Δx distributions to Gaussian functions, means are shown below.

μ_x vs. x

• I'm not sure, but I think the skews may be due to the cut used to identify when the hits matched between planes.