20200501-PREX2-Analysis

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Agenda

1. Tao : update on block level and polarity averages.HAPLOG 4092

PREX Respin 2, CREX Respin 1

We are close to ready for another round of respins. For these the changes are as follows:

1. Burp cut changes:
   • Loosen the burp cut so that the modulation data does not trip the burp cut
   • Increase the BPM cut from 0.35 mm to 0.6mm and that seems to rescue the BMOD data from cutting with minimal harm
   • A presentation on this can be made soon by either Quinn, Victoria, or Cameron
   • Unclear if this is needed for CREX yet
2. Change in the normalizing BCM:
   • The combination "(2*bcm_an_us + bcm_an_ds)/3" will be used for the normalizinf BCM, except for runs 3594-3573 which will use bcm_dg_ds
3. Pedestal updates:
   • Pedestals for BCM vs. unser, and everything vs. that BCM have been obtained for PREX and CREX
4. Use of combined BPM 11 & 12 in both regression and dithering for PREX, 1X instead of 4aX for CREX
5. AT detectors added to global error flag:
   • Doing this would allow our normal dithering and regression analysis to work for the ATs in all runs
   • Devi has looked at this, and including them for all two-arm runs would just result in losing 13155 total multiplet patterns from our grand statistics which is ~1.5 miniruns
6. Include Transverse running data and all NeedCut and Suspicious runs in the respin

Analysis projects

1. BCM double difference study
2. BPM resolution https://prex.jlab.org/DocDB/0004/000436/001/Dithering_CREX_presentation_05012020.pdf
3. Pedestal / Normalization BCM history
4. Events/ Patterns Counter
5. Dithering sensitivity/Quality re-check
6. Grand statistics re-check
7. Linearity check

Present

Excused

Paul K