20200403-PREX2-Analysis

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Logistic information

Meeting room at JLab: REMOTE ONLY

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Agenda

1. Tao : still investigating large chi-square and non-zero null asymmetry for the last wien.
   • Tao : seeing differences in main detector regressed asymmetries between different octet pattern polarity
   • KK : sounds like a 30 Hz , KP: it can be pairsync/pedestal pickup.
   • PK : it would be interesting to see central values by reversing one of the pattern polarity.
   • Tao: will check these.
2. Devi : AT analysis [HAPLOG 4061]
   • KK: we are focusing atl1 and usl differences. Do we have dithering correction results?
   • KP: some of dithering slopes are not yet qualified and the fine splitting of run range is still in progress.
   • DA: current dithering correction shows similar with regression. KP: the first wien/ihwp shows better chi/ndf in dithering than regression.
   • KK: we should document these and have an offline discussion
   • KP: we need to prove if main detectors saw false asymmetries or not.
3. Caryn : BCM resolution [HAPLOG 4060]
   • KP: BCM correlated noise get canceled by "2/3 + 1/3" BCM combination.
   • CP: we are trying to apply this combined BCM for entire run for respin2
   • CP: digital BCM shows current dependent Aq error in PITA scan
   • CP: we also saw intermittent correlate noise in BCM during the run.
   • CP: the resolution is calculated by solving and subtracting out charge asymmetry fluctuation from each BCM.
   • KK: I saw a 15 ppm hard floor in resolution and a few outliers below the floor. PS: it maybe just a very short run.
   • CP: we will clean up outliers after respin.
   • KK: I would like to know the systematic error as well.
4. Respin2
   • PK: need to set up combined BCM for charge normalization
5. CREX status:
   • CC: Plan was discussed on Wednesday WAC meeting.
   • CC: CREX respin will come after PREX respin2

Analysis projects

1. BCM double difference study
2. BPM resolution
3. Pedestal / Normalization BCM history
4. Events/ Patterns Counter
5. Dithering sensitivity/Quality re-check
6. Grand statistics re-check
7. Linearity check

Present

Kent P, Adam Z, Amali P, Bob M, Cameron C, Carrington M, Caryn P, Ciprian G, Devi A, Dmitrii N, Dustin M, Guido U, Iris H, Juliette M, KK, Paul S, Paul K, Quinn C, Robert R, Ryan R, Sanghwa P, Siyu J, Tao Y, Weibin Z, Ye T.