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Introduction

I've gone back to Eric's old page with the hope of picking up where he left off. Of course, this leads to the always enjoyable task of replicating the work that he has already done. The working directory for the previous analysis is:

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nSig

nBkg

Before Prefilters

~9x10^5

~4x10^6

After Prefilters

55015

48614

Pass 6 Performance

After applying the prefilters (which cut out a large portion of un-reconstructable events, I apply the ACD background rejection cuts, omitting the CT analysis to the files that I generated with Eric's scripts.

Name

Purpose

Gamma Efficiency
(5783)

Bkg Efficiency
(3784)

Cut

BasicTileCut

Reject events with track pointing at struck tile.

95.2%

7.85%

Code Block
(Tkr1SSDVeto == 0 && AcdTkr1ActiveDist > -16 && 
AcdTkr1ActDistTileEnergy > .4)

RibbonCut

Reject events with track pointing at struck ribbon.

94.9%

7.43%

Code Block
(AcdRibbonActDist > -(2 +350/sqrt(max(20,CTBBestEnergy))) && 
Tkr1SSDVeto < 3 && AcdRibbonEnergy > .05 )

TotalTileEnergyCut

Reject events with excess ACD total energy.

89.3%

1.17%

Code Block
(AcdTotalTileEventEnergyRatio > .8 || (AcdTkr1ActiveDistENorm > -300 && 
AcdTotalTileEventEnergyRatio > max(.005, .1 - .0001*AcdTkr1ActiveDistENorm)))

CornerCut

Reject events in the corner gap of the ACD.

88.4%

1.15%

Code Block
((Tkr1LATEdge/1.5) ^ 2 + (AcdCornerDocaENorm - 10)^ 2 < 3800 || 
(Tkr1LATEdge < 80 && abs(AcdCornerDocaENorm-2) < 4)) && Tkr1SSDVeto < 3

TileEdgeCut

Reject events at tile edges with decreased signal.

88.3%

1.15%

Code Block
(abs(AcdTkr1ActiveDistENorm) < 15 && AcdTotalTileEventEnergyRatio > .005)

These numbers seem to agree well with Eric's results. However, it naively seems like there are still some photons sneaking into the bkg sample. This is because selecting !(IrrFilter) will return True if McCharge == 0 (leaving about ~50 gamma events out of ~550). Putting a cut on McCharge, we now get a background rejection of 1.03%.

Pass 7 Performance

Moving on to Pass7, the ACD analysis has be modified a fair amount. I rebuild GR v17r35p10