Latest revision as of 18:36, 1 March 2017

Meeting Time and Place

The meeting will be on Wednesday March 1, 2017 at 2:15 pm EDT. For those people at Jefferson Lab, the meeting will be in room F326-327.

Meeting Connections

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Reconstruction & Analysis Studies Status

• Spring 2016
• Fall 2016
• Spring 2017

Agenda

1. Announcements
2. Data Production
3. Analysis Focus
4. This Week's Studies
5. Any other studies
6. Upcoming Study Schedule

This Week's Topics

• Talks: Summary/overviews only. Detailed discussions should be held in the appropriate working groups.
• Talks should be limited to 10 + 5 minutes.

Data Production

1. Monitoring Update --- Thomas Britton
2. Calibration Update --- Sean Dobbs
3. Processing Update --- Alex Austregesilo

Analysis Focus: Total Cross Sections

1. J/&Psi, [2]; --- Lubomir
2. η, ρ, ω, φ --- Simon
3. Any others?

Studies: Beamline & Triggering

Updates on experiment, simulation, and the comparison between the two.

1. Flux --- Justin log entry
2. Beam energy --- Beamline Group - log entry
3. Polarization (TPOL & lineshape) --- Beamline Group
4. Trigger emulation --- Alex Somov
5. Triggering efficiency --- Alex Somov

Upcoming Study Schedule

• Updates on experiment, simulation, and the comparison between the two.
• Summary/overviews only. Detailed discussions should be held in the appropriate working groups.
• All talks should be limited to 10 + 5 minutes.
• Next Week: Hit Efficiencies (i.e. Is the detector working?)

1. CDC Hit Efficiencies --- Naomi Jarvis
2. FDC Hit Efficiencies --- Alex Austregesilo
3. BCAL Hit Efficiencies --- Elton Smith
4. FCAL Hit Efficiencies --- Jon Zarling

• Week after next: Alignment & Track/Shower Efficiencies (i.e. Is the reconstruction working?)

1. Drift chamber alignment --- Mike Staib
2. Tracking Efficiencies --- Paul Mattione
3. BCAL Shower Efficiencies --- BCAL Group
4. FCAL Shower Efficiencies --- FCAL Group

• The following week: Other (Any of below if update ready)

1. Track / Hit Matching: BCAL, FCAL, TOF, SC
2. Efficiencies: TOF, SC
3. Means & Resolutions (time, energy, dE/dx): Tracking, BCAL, FCAL, SC, TOF
4. Uncertainties: PID (BCAL, FCAL, TOF), Kinfit (BCAL, FCAL, tracking)
5. Channel/Analysis Studies: Branching ratios, cross sections, SDMEs, beam asymmetries
6. Other reconstruction/analysis issues

Minutes

Data Production

• Thomas and Paul reported that the monitoring shows that their haven't been any serious issues in the data. In the reconstruction tests, the yields of ω and ρ events have been cut in half, but that's because a cut has now been placed on the beam energy at 7 GeV. This also cuts away ~all of the π⁰'s hitting the BCAL for the ω analysis.
• Sean reported that the calibrations for Spring 2016 are OK. For the current run, the detectors are aligned and most detector channels are aligned. The calorimeters are in the process of doing more detailed calibrations; the drift chambers need to be checked. The TAGM with new fibers is looking much improved. He is also making pi0, non-physics trigger, etc. skims.
• The goal is to start our next monitoring launch (first 5 files) over the Spring 2017 data on Friday.
• For the Spring 2016 data, after Mike's DC alignment studies are completed, we will perform our final reconstruction and analysis launches over the golden period of the data (runs 11366 - 11555).

Analysis Focus: Total Cross Sections

• Lubomir reviewed the status of the J/ψ total cross section measurements. There are a number of studies that need to be done, such as understanding the offset from 1 in the E/p for e+/- hitting the BCAL & FCAL, getting a better MC generation distribution, understanding the large discrepancy in the φ→e⁺e^- cross section at the coherent peak compared to a parameterization of old measurements, removing the cut on the kinematic fit confidence level, etc.
• Simon briefly reviewed the status of his studies of the ρ, ω, η, and φ cross sections. They are different between different decay modes, and there seems to be a humped structure that is consistent between the various channels. Simon will try not using the kinematic fit, will look into using Justin's flux measurements, as well as studying the cross section vs. t to take into account any issues with the acceptance corrections due to possibly having the wrong simulated t-slope.
• Other users are also encouraged to do their own cross section studies, and to present their results at these meetings.

Studies: Beamline & Triggering

• Justin presented the current status of his flux studies for the Spring 2017 data. He is primarily waiting on an improved tagger time alignment, which should be ready soon. He will also use David's new DBeamCurrent class in sim-recon to calculate the average flux for when the beam is on, instead of for the entire run.
• The flux no longer seems to depend on the orientation of the diamond, indicating that the beam is solidly on the diamond for this run period.
• Justin is using the PS acceptance determined from the Spring 2016 TAC runs, and when Alex Somov updates it for 2017 Justin can update his results.
• Sean reported that Alex D. has been studying the beam energy, and it seems that the corrections that were necessary for Spring 2016 are no longer necessary. He's working with the accelerator group to understand what has changed.
• Nathan has been looking at the flux from the TPOL, and it seems to be consistently in the 35 - 40% range. He will give an update at a future meeting.
• Alex Somov is working on simulating the trigger at the hit-energy level in GEANT, and he is getting close to being ready.
• To study the triggering efficiency for specific channels, the people who are analyzing those channels should work with Alex S. on measuring those efficiencies.
• Alex Somov will determine how much experimental data is needed for non-production-trigger events in order to study the channel-by-channel triggering efficiencies of the production triggers, so that way we can plan the run accordingly.
• Matt asked about detector noise simulation in the MC. Currently the plan is to mix in random trigger events, which covers backgrounds out of time of beam bunches, but in-time backgrounds need to be studied and perhaps included as well. Sean will continue to coordinate these activities.