Minutes - XEM Minutes

Meeting Information

Meeting Place: Virtual - Bluejeans

Meeting Time: Tuesday, 11:30 EST

Meeting Link: Refer to the weekly reminder email or calendar event for connection information.

Previous Meeting Minutes

Abishek

Plotting in xi different Q2 values for this setting.

Still working on ratio vs. density

Look at dummy and carbon target to map out any ytar dependence.

Ryan may be sharing densities for next week.

John's OG calculation, Dave's PRL values, recent values

Ryan's density extraction technique

Casey

Parameterizing kinematically forbidden contribution to cryo targs

Get resolution at X=2 from SIMC using a 'heavy' proton.

Check 5.1GeV hydrogen at X>1 to check kinematically forbidden events.

Cameron

Cherenkov Cal. documentation

PMTs are fine with lower HV and better voltages.

Dave's comment on cer cal:

Simply fit the HGC photoelectron peak and move on. (with reasonable timing cuts)

Follow Simona's second technique for the NGC.

FADCs aren't great for Cerenkov. Integrating ADCs would be better because they integrate the whole distribution.

Cer is always run in mode 10 during pion_lt exp, which saves everything. (Can treat fADCs like IADCs this way)

Current Tasks

Burcu

Looking at pi/e- ratios for X>1 data.

• x>1 data is well above the pion threshold of 4.65 GeV and the pion sample is contaminated.
• Based on the study need to decide on Noble Gas Cherenkov gas mix, unless we opt out using it (hopefully for upcoming week).

Casey

Write-up calibration procedures for XEM hodoscope, and calorimeter.

• Illustrate the usefulness of the diagnostic plots.

Run the XEM model for all EMC settings

Find what is happening to the YTrack= -2.5 blocks pulseInt

Open the reference time windows for the 2019 data slightly. Include random hits, which should be removed by good electron cuts.

Work on tracking in 2018 data. Pruning algorithm work

• Ali from Pion_LT running has some scripts / plots to help in this process.
• Possibly narrow the windows to select just the main peak?

Dave

EMC ratio anomaly, where it is not yet correct.

Abishek

Working on the point-to-point dependence of the error on acceptance.

Must add ‘added error’ to all momentum settings.

• Added error is until the Chi-2 value goes to ~1 per DOF. This is the ideal value, and this will give us an idea of the point-to-point error associated with the acceptance. **
• Possibly combine the two settings that have okay ratios (Data/MC) across the acceptance.

Systematic tracking efficiency is hard to pin down. Rel. Uncert. Comes from Deb’s study from rate dependence.

Cameron

Work through reference time and timing window cuts.

Recently Completed

Aishek

Isotopic purity assessment of boron targets

Carbon target EMC ratio with Dave M's boiling slopes. (still 2% off)

Looked at the EMC ratios with mc-single-arm detector checks turned off.

Dave

Log entry on cryo target density uncertainty

Look at target boiling difference between Dave Mack and our values.

Burcu

Reproduced Abishek's pion contamination (PC) study with the 21 deg EMC data (C and LD2).

Discussed the impact of the pre-shower and trigger cuts (ELHI and ELLO) on the PC study.

Casey

Set up analysis location on CDAQ machine (XEM-2022).

Ran the hodoscope calibration and improved the fit range of velocity and cable length difference.

Looked at possible problems with X>1 calorimeter calibration.

Checked 2019 kinematicaly forbidden range

Cameron

Many, many shifts.