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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 |
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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 | Bkg Efficiency | Cut | ||
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BasicTileCut | Reject events with track pointing at struck tile. | 95.2% | 7.85% |
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RibbonCut | Reject events with track pointing at struck ribbon. | 94.9% | 7.43% |
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TotalTileEnergyCut | Reject events with excess ACD total energy. | 89.3% | 1.17% |
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CornerCut | Reject events in the corner gap of the ACD. | 88.4% | 1.15% |
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TileEdgeCut | Reject events at tile edges with decreased signal. | 88.3% | 1.15% |
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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