data/monte carlo disagreement for rustem’s signal fluctuation variable in the far detector...
TRANSCRIPT
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Data/Monte Carlo disagreement for Rustem’s Signal Fluctuation
variable in the Far Detector(Working Title)
Part 2
Philip RodriguesOxford MINOS Group Meeting
5 Feb 08
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2
Low/High variable
• Rationale: muon tracks small variation between planes, non-muon tracks larger variation
• Construction:1. Exclude first 30% of track planes (to veto shower)2. Find window around reco’d track: ±4 strips, ±40ns3. Take all strips in this window (track and non-track)4. Sort these strips by PH5. Find mean PH of lower half, mean PH of upper half6. Low/High = mean of lower half / mean of upper half
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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?
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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!
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5
A suggestive distribution
• Additional small hits are at ±1-2 strips from track
• Diagonal xtalk can jump 1 strip• But so can physics
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6
A mini mystery
• Excess of tiny (<0.6 pe) hits in data
• Looks like crosstalk
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7
(De)Muxing
Tubes 0,2 Tube 1
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8
Crosstalk vs Physics
• Muxing pattern helps:• Simplistic way: P(hit on pixel i | hit on
pixel j )• Data/MC:
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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)
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10
More stats!• Cosmics could improve significance, but
angular dist, etc• ND PMTs, electronics different, but physics
should still show…
No ±1 strip excess!NN xtalk/afterpulsing
(Normalized to #events)
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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
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12
Backup
• Pull plots for small given track
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13
Backup 2
• Pull plots for any given any