Difference between revisions of "August 30, 2017, Production & Analysis Working Group"

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(Analysis Focus: Total Cross Sections, Acceptance Corrections)
(Analysis Focus: Total Cross Sections, Acceptance Corrections)
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# ω --- Cristiano
 
# ω --- Cristiano
 
# [http://www-meg.phys.cmu.edu/~schumach/LambdaAntiLambda_CMU_Analysis_v1.pdf {Anti-Λ Λ} first observation] --- Reinhard
 
# [http://www-meg.phys.cmu.edu/~schumach/LambdaAntiLambda_CMU_Analysis_v1.pdf {Anti-Λ Λ} first observation] --- Reinhard
 +
# [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=3381 {Anti-Λ Λ} first observation] --- Reinhard
 
# [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=3380 All neutral events with no charged tracks] Beni
 
# [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=3380 All neutral events with no charged tracks] Beni
 
# Any others?
 
# Any others?

Revision as of 16:22, 30 August 2017

Meeting Time and Place

The meeting will be on Wednesday August 30, 2017 at 2:00 pm EDT. For those people at Jefferson Lab, the meeting will be in room F326.

Meeting Connections

  1. To join via a Web Browser, go to the page [1] https://bluejeans.com/115815824.
  2. To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 115815824.
  3. To join via phone, use one of the following numbers and the Conference ID: 115815824.
    • US or Canada: +1 408 740 7256 or
    • US or Canada: +1 888 240 2560
  4. More information on connecting to bluejeans is available.

Reconstruction & Analysis Studies Status

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. Processing Update --- Alex Austregesilo
  3. Calibration Update --- Sean Dobbs
  4. Simulations Update --- Sean Dobbs

Simulation Reports

15 Minute summaries of progress and future plans on the 2017 mcsmear Workplan.

Analysis Focus: Total Cross Sections, Acceptance Corrections

  1. J/Ψ, φ --- Lubomir
  2. η, ρ, ω, φ spring 16/ spring 17 comparison --- Simon
  3. φ --- Thomas
  4. ω --- Cristiano
  5. {Anti-Λ Λ} first observation --- Reinhard
  6. {Anti-Λ Λ} first observation --- Reinhard
  7. All neutral events with no charged tracks Beni
  8. Any others?

Studies: Beamline & Triggering

  1. Flux --- Justin
  2. Beam energy --- Beamline Group
  3. Polarization (TPOL & lineshape) --- Beamline Group
  4. Beam Asymmetries --- Alex Austregesilo

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 & Triggering (i.e. Is the detector working?) Updates on experiment, simulation, and the comparison between the two.

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

The week after next: Alignment & Track/Shower Efficiencies (i.e. Is the detector working?) Updates on experiment, simulation, and the comparison between the two.

  1. Drift chamber alignment --- Mike Staib, Alex Barnes
  2. Tracking Efficiencies --- Paul Mattione, Cristiano Fanelli
  3. BCAL Shower Efficiencies --- Elton Smith
  4. FCAL Shower Efficiencies --- Jon Zarling

The following week: Other Updates on experiment, simulation, and the comparison between the two.

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

Minutes

Data Production

  1. Processing Update --- We are almost done processing the rest of the 2016 data. More analysis launches can be done as desired.
    • Paul: When next monitoring launch? Sean: Let's do one next Friday (9/8), will be useful prep for next reconstruction launch.
    • Justin: When should the next reconstruction launch be? Discussion: Certainly after DNP, potentially before the next run. Want to make sure there are enough improvements to use cycles on this. Focus is still mainly on simulations. Will revisit in two weeks.
    • Paul: Still fixing some edge cases before releasing the new Analysis library
  2. Calibration Update --- Naomi's
    • Want to include more skims when processing for the next run. Will send out some emails, feel free to make suggestions.
    • Important to check rates and errors to see what needs to be fixed for next production run.
  3. Simulations Update --- Simulation talks generated lots of good dicussion, currently collecting those and trying to get a simulation version together next week for testing. Aiming at large-scale simulations by the mid/end of September.

Analysis Focus: Total Cross Sections, Acceptance Corrections

  1. J/Ψ, φ --- Still need input from higher-statistics decay modes about the differences between data sets.
  2. η, ρ, ω, φ spring 16/ spring 17 comparison --- Simon showed some comparisons of phi cross sections between different data sets. For phi -> 3pi, the 2016 and low-intensity 2017 data are comparable, but the cross sections for high-intensity 2017 data are ~30% lower.
    • Many suggestions were made, including looking at the effect of varying the CL cut and looking at how the efficiency and background in simulation changes for the various conditions
  3. φ --- Thomas is in the process of redoing his results, should have them in a day or two.
  4. {Anti-Λ Λ} first observation --- Reinhard gave a nice overview of a study of gamma p -> p Lambda anti-Lambda
    • This reaction has never been seen before, most of the work was done by undergrad Samuel Dai
    • Various dE/dx, timing, and kinematic fit CL cuts are used.
    • Clear Lambda and anti-Lambda peaks are seen. Paul: These are probably okay, but need to study how the kinematic fit is shaping these distributions.
    • Lambdas appear to be produced forward and backwards, anti-Lambdas only produced in the forward direction. There was discussion about needing to understand the backgrounds to distributions such as these.
    • Flight distance distributions give consistent lifetimes for lambda and anti-lambda, smaller value than known value. Paul: the old analysis library used for this results is known to cut off events at large flight distance because it doesn't completely correct for the displaced vertices. This is fixed in the newer library
    • Lots of physics can be done with this reaction
  5. (All neutral events with no charged tracks) Beni looked at events with neutral particles in the calorimeter and a very low-momentum proton, measured by a hit in the start counter.
    • He is able to reconstruct several final states
    • He sees exclusive pi0 events at very low t, but very few events
    • He sees a large number of omega -> gamma pi0 events, potential for interesting studies
    • He also sees a robust signal for f2(1270) -> pi0 pi0

Studies: Beamline & Triggering

  1. Flux --- Justin
  2. Beam energy --- Beamline Group
  3. Polarization (TPOL & lineshape) --- Beamline Group
  4. Beam Asymmetries --- Alex Austregesilo