news from may cosmics gc jacques & yasmine
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News from May Cosmics GC Jacques & Yasmine. 16 mai 2008. Plan for the discussion. « It’s all about timing » Yasmine has a plane to take @ 18h50 :-) 1Zone by zone analysis needs brainstorming 2Efficiency of the selection We have an explanation - PowerPoint PPT PresentationTRANSCRIPT
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News from May Cosmics GC
Jacques & Yasmine16 mai 2008
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Plan for the discussion
« It’s all about timing » Yasmine has a plane to take @ 18h50 :-)
• 1Zone by zone analysis needs brainstorming
• 2Efficiency of the selection We have an explanation
• 3High multiplicity events Irina suggests in her mail a way of understanding this.
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data
• Run 22476 from GC May 08.• We started to worry because:• We noticed that the rms of the asymmetry Was worse then what we had in the
previous run (10/04/08).We made the same plots as usual ref: mail
from Jacques Jeudi 8 mai only we seperate them for each zone of the ECAL and the HCAL see slide 3-12.
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HCALCurrent/Next Outer
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HCALCurrent/Prev Outer
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HCALCurrent/Next Inner
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HCALCurrent/Prev Inner
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Up to now the HCAL
• HCAL:
• The behaviour of the HCAL seems fine:1We have roughly the same
number of events in the Current/Next or Current/Prev.
2 the difference of the statistics between the Outer and the inner zone is consistent with the geometry of both regions.
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ECALCurrent/Next Outer
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ECALCurrent/Prev Outer
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ECALCurrent/Next Middle
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ECALCurrent/Prev Middle
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ECALCurrent/Next Inner
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ECALCurrent/Prev Inner
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Up to now ECAL ouch!
• The middle ECAL seems fine.
• The outer ECAL is strange we see only 25 Current/Next events for 600 events in the Current/Prev!
• The amount of selected events in the inner ECAL is really small 8 Current/Next events and 0 Current/Prev events!!!
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Conclusion for Part 1
From looking at the same distributions for different regions of the XCAL we learn a lot!
ex: the number of events in Current/Prev and Current/Next is really different!!
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Old remaining pbs!
• We go back to the run of march A side 20876
• We start with 13686 and we end up with 663 for the coincidence the efficiency
of the whole selection is 4.8 % while from the trigger side we know that we should have 95% good cosmics.
Question: Where do we loose them?
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What we do in detail
For each cell: ADC(P)+ADC(C) > 150 or
ADC(C)+ADC(N) > 150 for the ECAL (resp 20 HCAL)
For each Event : Condition2: Hits >1 Condition3: |R|<0.8 We always have two sets of events, events which
appear in the Current/Next or Current/Prev.Note: In the following the conditions 1,2,3 will be Refered as C1, C2,C3.
Condition 1
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Selection in detailRun 14 Mars
• ECAL – Current/Prev
• After C1: 4524• After C2: 3796• After C3: 968
– Current/Next:• After C1: 7286• After C2: 6420• After C3: 27
• HCAL– Current/Prev:
– After C1 : 5965– After C2: 5084– After C3: 3259
– Current/Next:– After C1: 6828– After C2: 5105– After C3: 148
Note: Within in ECAL events 32 are not usuable # of hits>60.
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So
• For the Current/Prev Events we loose a lot !This is explained by the fact that in this run we had a +7 ns offset computed from the fit.
• For the Current/Next Event we loose almost everything because of the extra L0DU delay that we had in this run! In the analysis we looked at Prev1/Current/Next1 but really the cosmics were in Prev2/Prev1/Current!
• To validate these hypothesis, we should look at the selection efficiency for a run where the offsets in the TTCRx were corrected and where we have no pb with the
L0DUNext slide
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10 April Run C side But the offsetin the TTCRx
were corrected• ECAL
– Current/Next • After C1:5752• After C2: 4921• After C3:2955
• Current/Prev• After C1: 4985• After C2: 4467• After C3: 2888
• HCAL– Current/Prev
• After C1: 5808• After C2:5097• After C3:3375
– Current/Next• After C1 : 4636• After C2: 3911• After C3: 2918
Conclusion for part 2:We Start with 10893 Events out of which 2907 were used for the coincidence studyWe have 28% of efficiency which sounds reasonable!
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22 Event 588 Run 22476
Either a super nova? but most probably something that we need to understand!
We saw this previously in March.
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Summary of events with mutiplicity > 60
• 9 events in total. • 8 are always in the same Y region
according to Irina these events might be actually LED Events.
• 1 Event doesn’t belong to this region see event display in the following
slide.
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Event 21408
Bremsstralhung??
Prs Ecal Hcal
From Olivier
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Back up slides
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To understand the strange behaviour of the inner ecal:
ECALCurrent/Next InnerEvent display
And we use the « eye» pattern recognition !
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27Event 2043 Run 22476
Cosmic
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28Event 2528 Run 22476
Cosmic
Cosmic
The direction In the ecal and The hcal does not make any sense!!!!
Yasmine’s Culpa !!!!Thanks Olivier for the cross check!
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29Event 2528 Run 22476
Cosmic
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30Event 2643 Run 22476
Cosmic
Cosmic
Noise??
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31Event 1313 Run 22476
Cosmic
Cosmic??Why not!