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Philip Rodrigues Oxford MINOS Group Meeting 5 Feb 08

Data/Monte Carlo disagreement for Rustem’s Signal Fluctuation variable in the Far Detector (Working Title) Part 2. Philip Rodrigues Oxford MINOS Group Meeting 5 Feb 08. Low/High variable. Rationale: muon tracks small variation between planes, non-muon tracks larger variation Construction:

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Philip Rodrigues Oxford MINOS Group Meeting 5 Feb 08

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  1. Data/Monte Carlo disagreement for Rustem’s Signal Fluctuation variable in the Far Detector(Working Title)Part 2 Philip Rodrigues Oxford MINOS Group Meeting 5 Feb 08

  2. Low/High variable • Rationale: muon tracks small variation between planes, non-muon tracks larger variation • Construction: • Exclude first 30% of track planes (to veto shower) • Find window around reco’d track: ±4 strips, ±40ns • Take all strips in this window (track and non-track) • Sort these strips by PH • Find mean PH of lower half, mean PH of upper half • Low/High = mean of lower half / mean of upper half

  3. Outline • ND Low/High problem fairly well studied • FD still uncertain • Various ad hoc cuts help • Crosstalk looks promising • This week: • Is it track modelling or detector modelling?

  4. Crosstalk • Fixes up low/high distribution • Doesn’t fix up everything else • Not conclusive: • model is more complicated than the one param I changed!

  5. A suggestive distribution • Additional small hits are at ±1-2 strips from track • Diagonal xtalk can jump 1 strip • But so can physics

  6. ( ) A mini mystery • Excess of tiny (<0.6 pe) hits in data • Looks like crosstalk

  7. (De)Muxing Tubes 0,2 Tube 1

  8. Crosstalk vs Physics • Muxing pattern helps: • Simplistic way: P(hit on pixel i | hit on pixel j ) • Data/MC:

  9. Crosstalk vs Physics 2 • Less simplistic: P(small hit on pixel i | track hit on pixel j) • 9/6 pair goes opposite way on different tubes! • Not very significant (see backup slides)

  10. More stats! • Cosmics could improve significance, but angular dist, etc • ND PMTs, electronics different, but physics should still show… NN xtalk/afterpulsing No ±1 strip excess! (Normalized to #events)

  11. Tentative conclusion • Extra hits at ±1 strip consistent with crosstalk • But low stats crosstalk map seems to disagree • ND shows no extra hits at ±1 strip • Not physics • Believe the ND over my ad hoc crosstalk map: • Effect is not physics

  12. Backup • Pull plots for small given track

  13. Backup 2 • Pull plots for any given any

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