Π polarizability Meeting Apr 15, 2020
Meeting Time And Location
9:00 EST (JLab time)
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- Previous meeting: Apr 8, 2020
- Update on Engineering/Design
- Data Analysis - Andrew
- BH sensitivity to form factors (Rory)
- Preparations for Jeopardy
- Instructions for Jeopardy (Rory)
- Other business
- Next meeting
Attendees: Albert F., Andrew S., Elton S., Iliya L., Mark I., Rory M., Nick B., Vambow
- Tim sent e-mail a few days ago asking about alignment requirements of absorbers and chambers
- is +/-4mm good enough
- what about reproducibility if platform must be moved
- General consensus was that 4mm will not be accurate enough given the size of the beam spot and holes.
- Some top-of-the-head estimates that we'll need at least +/-2mm and possibly even better
- Elton noted that +/-1mm will probably be pretty difficult but we'll need to discuss it with Tim
- Iliya suggested a different spec. for the upstream Pb absorber than other components may be an option since that will be stopping most of the low energy beam halo
- Rory will respond to Tim's e-mail and ask if we can schedule a meeting next week to discuss it
- Andrew has made some progress in calculating the acceptance of e+e- events as a function of invariant mass.
- expanded cut on θ to be >0.75o as opposed to previous cut of >0.1o
- acceptance peak dropped to below 1.0 (previously it had been >3)
- discussed the possibility of floating point round off errors, but unable to clearly identify that as source.
- Some work has started on MVA
- Suggested schedule from Bob M. was to keep new proposals due June 1st (no change) and give Jeopardy proposals an extra 2 weeks (June 15th).
- Schedule not finalized yet and will depend on negotiations between PAC members and lab management
- Rory will set up LateX document with outline so we can start working on it.