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Looking in gamma_ana.txt, I found the exact cuts that Eric was using. Namely, the prefilters that were being applied before the cut efficiencies were evaluated. I've listed them here for completeness. One slightly troubling detail is the dependence on CTBCore > 0.1 (which has not yet been defined in the Pass8 analysis). Another is that the irreducible background filter does not seem to cut out the Earth10 photons which come standard in the background mix.
nSig | nBkg |
---|---|
~9x10^5 | ~4x10^6 |
Name | Purpose | Gamma Efficiency | Bkg Efficiency | Cut | ||
---|---|---|---|---|---|---|
IrrFilter | Remove irreducible bkg events | 0% | 13% |
| ||
TkrCalCore | Take only "good" events | 6.2% | 2.2% |
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AcdEngFilter | Only events with moderate signal in the ACD | 0% | 47% |
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Prefilter | Only select relevant events | 6.2% | 1.2% |
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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. I've also listed, in parentheses, the background efficiency removing the Earth10 photon contamination.
Name | Purpose | Gamma Efficiency | Bkg Efficiency | Cut | ||
---|---|---|---|---|---|---|
BasicTileCut | Reject events with track pointing at struck tile. | 95.2% | 7.85 (7.85% 37)% |
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RibbonCut | Reject events with track pointing at struck ribbon. | 94.9% | 7.43% 43 (6.95)% |
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TotalTileEnergyCut | Reject events with excess ACD total energy. | 89.3% | 1.17% 17 (1.04)% |
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CornerCut | Reject events in the corner gap of the ACD. | 88.4% | 1.15 (1.15% 03)% |
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TileEdgeCut | Reject events at tile edges with decreased signal. | 88.3% | 1.15 (1.15% 03)% |
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