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Bill Atwood, SCIPP/UCSC, Dec., 2003 GLAST ALL GAMMAs using the New Recons First runs of ALL GAMMA – from glast-ts and SLAC Unix farm glast-ts sample: no.

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Presentation on theme: "Bill Atwood, SCIPP/UCSC, Dec., 2003 GLAST ALL GAMMAs using the New Recons First runs of ALL GAMMA – from glast-ts and SLAC Unix farm glast-ts sample: no."— Presentation transcript:

1 Bill Atwood, SCIPP/UCSC, Dec., 2003 GLAST ALL GAMMAs using the New Recons First runs of ALL GAMMA – from glast-ts and SLAC Unix farm glast-ts sample: no cuts – cal. only events, "NoCal" events, + regular 200K SLAC Unix Farm: cuts - TkrNumTracks > 0 940K (Sat.) + 510K (Sun.) Available.... ftp://ftp-gla st.slac.stanford.edu/glast.u06/richard/allGamma-20050618/merit-200506-pruned-2.root There are new nTuple Variables for both Tracker & Cal

2 Exercise Goals 1)Begin re-building 1)"GoodEnergy" Analysis 2)PSF Analysis 3)Back Ground Rejection Analysis 2)Exercise the MC Pipeline ( For DC2 estimate 5x10 8 background events) 3) Provide data for DC2 workshop ( Background events coming this week) ALL GAMMA Definition: Disk generation area = 6m 2 ; Soild angle: 2  str. A eff x  = 37.7 m 2 -str. (SR: 2.0 m 2 -str)

3 GoodEnergy Analysis Step 0: Look at the data! Events in nTuple 54878 (10.3 m 2 -str) No Cuts TkrNumTracks > 0 Events: 30117 ( 5.68 m 2 -str) SR: Convert > 65% of  s

4 Switch to  cos(  ) CsI RLnGap Fraction

5 Angle between Tracker Dir and Cal Dir Max. Energy in Single Xtal Tracker Dir - Cal Dir Comparison Energy "Zeros" near LAT Edge

6 Moments Analysis: Say a Moment of Inertial (see Goldstein). Showers form figures of revolutions about the shower axis. Two larger moments are approx. equal. and a small moment (moment about shower axis). Eigenvector associated with smallest moment is the shower axis. Capture Moments Information by :

7 A First Gamma Selection: CalTotalCorr < 3.5 & CalDeadTotRat <.15 & CalGapFraction <.30 & CalTransRms < 60 & CalLRmsAsym > 0. & CalCsIRLn > 4 & CalEnergyRaw > 5. ~ 300 Events/Bin A eff x  = 2.8 m 2 -str Aeff vs Log(E MC )

8 Step 1: Re-do the Energy and cos(  ) dependencies

9 That's as far as its gone so far. GOOD PROGRESS! Lot's of puzzles to solved. No "Show Stoppers" observed And... The re-write of the Recons is a Success! Go see for yourselves!

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