1. Tower A: A First Look Finding the Data: Login: THIS ONE! user: glast
pw: glast
THIS ONE!

2. Down Load this one ( ~ 68 MB)
~ a long ways down
Down Load this one ( ~ 68 MB)
A minor discrepancy: What arrived was events
(according to Run List: events)
Name of File: recon-EM2-v1r0_ _merit_merit.root

3. Found Tracks: Phase Space
Events Selection: TkrNumTracks > 0 and Tkr1X0 & Y0 within Tower Limits
Yield: 100K Events f
cos(q) Z0

4. Found Tracks: Phase Space (continued)

5. Single Tracks: Finding the DEAD STRIPS
Merit Variables: Trk1FirstGapPlane and Tkr1XGap, Tkr1YGap
Single Strip
Clearly Seen

6. Single Tracks in the Calorimeter
Events Selection: CalEnergySum > 5 MeV
Yield: 23.9K Events
Expected
MIP Events

7. More Calorimeter
Events Selection: CalXtalsTrunc > 7 & < 11
Yield: 9400 Events
MIP Signal SHOULD BE
~ 100 MeV (Oooppss!)
Layer-by-Layer

8. Finding the Gammas Used Merit Variable Tkr1SSDVeto TKR Track
Projection
This variable is a count of the
number of silicon planes the
projected track crosses
Allows using the SSDs in the
tracker as an ACD
Found Track
CAL
Require: Tkr1SSDVeto > 0 &
CalEnergySum > 50
Yield: 12 K Events
Vertex Events are cleaner
Keep These
Keep These

9. Are the remaining events gs? Resulting Distributions of First Layers
Good g events
point to
Calorimeter Energy
Keep These
Are the remaining events gs?
Resulting Distributions of First Layers
213 Events
Expect step from Thin-to-Thick = 1:4.3
Estimate Background to be ~ 14%