Mattione Update 12142011

Summary

• DC dE/dx determination is done and checked into svn. Confidence levels are flat for protons, pions, and kaons, in both the FDC and CDC.

K⁺'s

• FDC K⁺ dE/dx μ & σ
  • σ is dependent on amount of information: # hits USED (= 1/2 of total # hits: reject largest dE/dx hits to remove Landau tail)

FDC, K+, μ

FDC, K+, σ

• CDC K⁺ dE/dx μ & σ
  • σ is dependent on amount of information: # hits USED (= 1/2 of total # hits: reject largest dE/dx hits to remove Landau tail)

CDC, K+, μ

CDC, K+, σ

Particle Overlay

• dE/dx μ vs p for different particle types & CDC/FDC (error bar is overall σ (particles generated uniformly across θ & p))
  • 2nd plot is zoomed in version of 1st plot
  • Low momentum kaons overlap pions because they decayed: dE/dx χ² not evaluated for kaons in this region.

Same plot, but zoomed in.

Confidence Levels

• Confidence Levels for FDC/CDC dE/dx for protons, pions, and kaons:

Protons, FDC	Protons, CDC
PiPlus, FDC	PiPlus, CDC
KPlus, FDC	KPlus, CDC