Revision as of 16:10, 23 February 2023

1. meeting link to zoomgov
2. meeting page

Thu 2/23/2023 2pm

Agenda

1. Detector status:
   • CDC
   • FDC
   • GEM-TRD
2. Tracking
   • Differences between run periods
     • Ratios of for production for the different beam times and batches. Ratios are always taken with respect to full 2018-08 data.File:L1520 cs ratios.pdf
     • Same ratios vs beam current * radiator thickness
       

       xs/xs(fall 2018) vs nA.um
     • Alex's rho xs update, dependence on beam current in 2017 SDMEs
       
     • Thoughts:
       1. Run monitoring histograms (CDC_Efficiency, CDC_dedx what else?) over bggen
       2. Are the random triggers enough to simulate the extra DC hits (from photons) in 2017 before the W foil was added? We might be able to identify these from integral/amplitude.
       3. For the higher intensity runs we might be able to use the quality codes from the timing algo, it identifies pulses w too high pedestal.
       4. What is already in the MC, that we aren't using properly? Pedestal width? Straw efficiency?
3. AOB

Scrappy Minutes that will be tidied

CDC is ok FDC has a non-critical problem that Lubomir is aware of, he will be back in a few days

Tracking Peter's plots.

std dev on plots is about 5%

fall 2018 is within that last 2 batches of sp 18 arent 2017 low/hi looks dramatically significant

Alex's old plot shows diffs, wasn't split into l/h sdmes l/h 17 show sig diffs in unpol sdmes most likely to be affected by abs norm.

looks like sim is not perfect.

AA proposes to include this as systematic.

hit efficiency for cdc is modelled as 1/0 can we see the difference w beam current

W foil added before 42228 between spring and fall 18.

so maybe that's not a clue.

spring 17 had a different reconstruction version

Peter will compare hi & low intensity for rest v4.

what about efficiency with straw number.

compare overall and indiv. straw eff for spring and fall 17.

naomi will make a ccdb with the straw eff built in, give to Peter & Alex for xsections.

find out what the cdc hvb currents were in spring 17. compare to recent data if hvbi spring 17 ~ hvb recent then would tell us if randoms are approximating noise with and wo W foil.

Sean: tag and probe eff study for delta ++ would be helpful. Idk who could do this. Jon might have a MC config file. 2017 trees with looser PID timing cuts could be useful - need a new analysis launch (start w high intensity 17)

Monitoring launch over bggen for diff run periods might reveal something useful. Last did this a long time ago. Worth revisiting w new samples. Alex will do this.

Pedestal width. Could look at sigma for diff run periods.

We need to look at the QF codes from the timing algo for the recent very high intensity runs, we might be able to do some bad-hit recovery. This is interesting but not immediately urgent.

naomi can try to make xs plots for phi.

could we cut off cdc data after 100ns? **** forgot to mention this. but this would be a good but drastic way to eliminate CDC bad gas issues sp 18