1 / 16

Crosstalk Removal to Improve Muon dE/dX Measurements

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

lulu
Download Presentation

Crosstalk Removal to Improve Muon dE/dX Measurements

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Crosstalk Removal to Improve Muon dE/dX Measurements Leo Jenner, UCL UCL 2nd Year Talk

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

  3. A Cosmic Ray Muon Crosstalk removal helps with Tracking and is also important for correcting muon dE/dX for relative calibration of the MINOS detectors. UCL 2nd Year Talk

  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 if 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 energy deposition combined with photon statistics can lead to crosstalk with very comparable energy to real hits The Crosstalker currently runs as a module before the CalDet muon tracking code Testing is taking place on Crosstalking Monte Carlo UCL 2nd Year Talk

  5. Number of Crosstalk hits: Truth vs Tracked • The crosstalker finds about 82% of the crosstalk hits as I’ve opted for a high purity (>90%) UCL 2nd Year Talk

  6. dE/dX from Monte Carlo (Truth and Tracked) UCL 2nd Year Talk

  7. Comparison of MC truth to MC+Tracking • For the most part there is good agreement… UCL 2nd Year Talk

  8. 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… UCL 2nd Year Talk

  9. Last Plane Hit • Some of the hits at the end of the track seem to go missing after tracking… UCL 2nd Year Talk

  10. 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 • Noise also creates spurious hits at the end of the track UCL 2nd Year Talk

  11. Preliminary comparison to data • Quite low statistics but it still looks a bit odd UCL 2nd Year Talk

  12. Data - Last Plane Hit • Even with cut: 10<first strip hit <13 ‘PS’ Muons, Other off momentum muons coming down the beampipe UCL 2nd Year Talk

  13. Conclusion • More work to do to optimise Tracking and Crosstalk removal using Monte Carlo • Fold crosstalk back into real hits to further improve MC dE/dX • Apply crosstalk removal to data UCL 2nd Year Talk

  14. UCL 2nd Year Talk

  15. 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 UCL 2nd Year Talk

  16. Number of Hits Truth vs Tracked UCL 2nd Year Talk

More Related