December 13, 2023 Calorimeter

Meeting Day/Time: every 4th WEDNESDAY at 11:00 a.m. JLab time (monthly frequency during the long shutdown)

Connection instructions

Connect to ZoomGov Meetings

References

1. FCAL HDFCAL log book
2. ECAL HDECAL log book
3. BCAL HDBCAL log book
4. CCAL HDCCAL log book
5. Calibrations: 2020 Data Production; RunPeriod-2019-11 Validation; Offline Monitoring Data Validation
6. Photon Reconstruction Task Force
7. BCAL calibration links, 2020, PrimEx, SRC

Goals for Calorimetry Group

1. Determine preliminary photon reconstruction efficiencies as a function of E, phi and theta in data and simulation with a point-to-point precision of at least 5%.
2. Measure systematics of pi0/eta mass calibration as a function of detector position to a precision of at least 5 MeV.
3. Demonstrate agreement of photon resolution between data and simulation as a function of E, phi and theta to within 5%.
4. Demonstrate agreement of photon reconstruction efficiency between data and simulation as a function of E, phi and theta to within 5%.

Action Items

1. Short term CALWG Items
2. Long term items
3. Calorimeter work packages
4. AI - BCAL Monitoring:
   1. Hydra Real-Time Dashboard
   2. Hydra 24-hr Monitoring Logs

Tentative Agenda

1. Announcements
2. Calibration
3. Any other business

Minutes

Attendees: Ilya, Rory, Jon, Sean, Igal, Simon, Malte, Mark, Alex, Zisis"

1. Announcements: this is a dedicated meeting on calibration, with presentations by Ilya and Igal.
2. Calibration:
   1. Ilya: he summarized his work on CPP/NPP calibration. See his previous postings: GlueX-doc-5877 and GlueX-doc-6216. The first one includes considerable details. Ilya has derived new calibration constants but have not been uploaded yet. The high Z targets here mean different e/m background as compared to nominal GlueX running; pi+/pi- vertex helps with e/m background and results in good pi0 in the centre of FCAL. The BCAL obscures the outer FCAL regions. Ilya said that the pi0 skims are ok, but could we do better? Typically, 10 iterations are needed. Energy linearity was examined up to 6 GeV photons: asymmetric pi0->gg were used, with g1 between 1.5-2 GeV and g2 scanned up to 4.5 GeV. Also omega->pi0g was used and g went up to 8 GeV. LED corrections to the pi0 gain were not successful; jumpy LED channels. Ilya did not use cooked data, just skim filers. It would be good to implement Ilya's code using omega skims and apply to PrimEx/GlueX. Ilya and Igal will collaborate offline and share their constants.
   2. Igal covered his standard approach, as can be seen, for example, in GlueX-doc-6293. PrimEx is quite clean!
3. Any other business: none.