JEF meeting, June 3, 2022
From GlueXWiki
meeting time and location
- 9:30 am EST (JLab time) remote only
- Zoom meeting ID: 161 050 9142 Passcode: 004965
Agenda
- Simulations/Analysis
- Background simulation update-- Simon
- eta to ggpi0 update -- ig
- diphoton separation plots (files tagged as 'MAY30') -- Tegan
- Preparation of parts for FCAL2 modules -- Sasha
- Module fabrication -- Sasha
- Light Monitoring System -- Arshak
Minutes
Attendees: Sasha,Bill,Liping,Phil,Olga,Jon,Igal,Daniel,Tegan,Susan,Jane,Arshak,Jaden,Dax,Vadim,Jared,Adam,Gavin,S.T.
- S.T. gave an update on simulation of the π0π0 background for η→π0γγ
- Goal is to understand the shape and scale of the background
- New generator genScalarRegge with parameters tuned to existing FCAL2 data
- Use to estimate background for FCAL2 in anticipation of possible submission to PAC next year
- Igal has been looking at shower seperations between π0 and bachelor γ for the golden JEF channel
- Finds different distributions depending on how the decay post-processor evtgen is used
- Some evidence that shower shape in Island Algorithm (IA) for lead glass blocks may not be correct
- The default (DA) shower reconstruction algorithm does not work well when the showers are too close
- The Island algorithm reproduces reasonably well the thrown separation when using the center-of-gravity (actually a fitted position)
- The log-weighting method fails for close clusters for both algorithms, with a pronounced peak near zero separation for IA
- Compared IA and default algorithm reconstruction of π0γγ relative to η→3π0 background
- Peak in simulation at η mass looks sharper for FCAL2 compared to FCAL1
- TOF veto reduces signal by factor of 4 but does suppress η→2γ peaking background
- Tegan showed some shower separation plots from his di-photon studies
- Confirmed poor performance of log-weighting method for position if the clusters are too close
- IA works better than DA for center-of-gravity position method
- Could in principle check IA using real data in CCAL following Ilya's scheme for mixing events used for PrimeX
- No news regarding moving FCAL2 module fabrication setup to new building
- Olga delivered a batch of cookies from GWU
- PRs can now proceed: PMT sockets, integrating sphere
- Got permission to move CRYTUR crystals from JLab pool to us
- Students now at lab working on various stages of module fabrication, encouraged to give updates at this meeting
- Checked 112 NPS replacement (SICCAS) crystals for color, bubbles, dimensions
- Work on wrapping, cutting ESR/Tedlar,etc.
- Need to glue/wrap light guides (1127 needed)
- Grand total of 459 modules fabricated