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Crosstalk Removal to Improve dE/dX measurements

Crosstalk Removal to Improve dE/dX measurements. Leo Jenner, UCL. In brief. Crosstalk removal algorithm Comparison of MC truth to Tracking + Crosstalking Some hitches… Preliminary comparison of MC to data. A Cosmic Ray Muon. Crosstalk removal helps with Tracking

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Crosstalk Removal to Improve dE/dX measurements

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  1. Crosstalk Removal to Improve dE/dX measurements Leo Jenner, UCL

  2. In brief • Crosstalk removal algorithm • Comparison of MC truth to Tracking + Crosstalking • Some hitches… • Preliminary comparison of MC to data

  3. A Cosmic Ray Muon Crosstalk removal helps with Tracking And is also important for correcting dE/dX For relative calibration of the detectors

  4. CrossTalk Algorithm • Work through all the hits in a given pair of planes and look at the 8 pixel window around each ‘test’ hit • Sum the charge and identify the largest hit in the window • The test hit is flagged as crosstalk it its charge is less than the sum of the pixels around it, multiplied by a user definable factor. This is usually set to 1 for beam/cosmic muons since low eneryg deposition combined with photon statistics can lead to crosstalk with very comparable energy to real hits • The Crosstalker currently runs as a module in Chris Smith’s CalDetTracker muon tracking code • Testing is taking place on Mike Kordosky’s Crosstalking Monte Carlo

  5. Number of Crosstalk hits: Truth vs Tracked • The crosstalker finds about 82% of the crosstalks hits as I’ve opted for a high purity (>90%)

  6. Comparison of MC truth to MC+Tracking • For the most part there is good agreement…

  7. Number of Hits: Tracked/Truth A close up of the last few planes Shows the discrepancy increasing • But only 0.32% of events go to plane 54 or more

  8. Last Plane Hit • Some of the hits at the end of the track seem to go missing after tracking…

  9. Very curvy muons • In the third plot along the two blue hits at the end of the track are genuine track hits • Maybe the muon curves sharply to the left and travels in the air gap between planes • The tracker doesn’t nominally find the last hit because it falls outside of the search window

  10. Anomalies • Entry: 2340943 Record: 3107 End: A Plane: 48 Strip: 8 HitBit: 786432 PE: 5.86536 TrackEnd: B Plane: 48 Strip: 8 HitBit: 786432 PE: 7.3501 • Entry: 2340944 Record: 3107 eventnum: 3107 Entry: 2340945 Record: 3107 eventnum: 3107 : End: B Plane: 54 Strip: 10 HitBit: 0 PE: 0.935773 • Entry: 2340946 Record: 3107 eventnum: 3107 There is an unphysical hit of nearly 1pe… it’s ignored by the truth (see above) but the tracker finds it

  11. Preliminary comparison to data • Quite low statistics but it still looks a bit odd

  12. Data - Last Plane Hit • Even with cut: 10<first strip hit <13 PS Muons, Other off momentum muons coming down the beampipe

  13. Conclusion • More work to do to optimise Tracking and Crosstalk removal using Monte Carlo • Fold crosstalk back into real hits to furter improve MC dE/dX • Apply crosstalk removal to data

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