Agenda

  1.  Pass2  (some will be basic “All OK, nothing to say” items.)
    1. ECAL                                             — Holly
      1. ECAL Geometry - status
    2. SVT                                               — Sho
    3. DST                                               — Omar
    4. Tracking                                         — Omar & Matt
    5. B-Field                                           — Norman & Omar
    6. Processing + Resources               — Nathan
    7. Database                                       — Jeremy
  2. Pass-N 
    1. How much data to keep?              — All
    2. Which filters should we set up?    — All

Notes

Key discussions during the meeting:

New ECAL position

The new survey results seem to indicate that the ECAL is shifted by only 1mm, not the 3 mm that we had for the Pass1 processing. This number still needs to be finalized. There was some discussion whether this should delay starting pass 2. The consensus we came to was that it would be worth having the survey results included, if it does not delay the start of pass 2 by too much. It is already clear that there will be a pass 3 processing of the unblinded data anyway in the not too distant future, and if not ready by Wednesday morning, we can start pass 2 and save the ECAL survey shift for pass 3. 

Omar noted that if we move the ECAL then we will need to adjust the cluster matching cuts, otherwise we risk having too few matches. This may be needed anyway because the fringe field in the new field map shows the field is not perfectly in the y direction but has x and z components, which would steer the beam in the y direction.

We will run a new pass 2 test very soon (today?) and take a look at the output with the new field and see if any adjustments are needed.

 Tracking

 There were many changes to the tracking code, which Omar reported on:

  • A major change is that 3 additional tracking strategies are run. Each strategy will create its own track collection, which means that these collections will have duplicate tracks. The "Matched Track" collection of old will still exist.
  • Recon particle driver needed many changes due to the multiple track collections.
    • The different track collections all go in to the same list.
    • Omar will provide a filter example (in Java) to select a particular track collection
  • Vertex of e- e- pairs will be included as "Moller Candidates". There is top+bottom requirement for these vertexes.
  • There will be a track state added for the track at the ECAL face.
  • Add a track type, which will include what strategy created the track, and whether it was GBL constrained. This will go into the DST.
  • Sho made a significant improvement in the speed of the tracking code.
B-Field

The new magnetic field is now available. See Norman's slides. It was decided that if the Pass 2 test works out OK, this will be included in  Pass2.

Database and Timestamp

Jeremy has the basic code for the new time stamp, based on a ns accurate epoch time, ready. There was some concern that this change would break various bits of code that depend on the way the getTime() method is currently implemented. It seemed best to leave the current definition until we have a better understanding on how well a switch to the new time will work.

Action Items:

  1. We will run a Pass 2 Test as soon as possible. This test will include the new B-field.
  2. If the Orsay group can finalize the ECAL survey before Wednesday, the new ECAL position can be included in Pass 2, otherwise it will go in the next pass.
  3. We will start Pass2 on Wednesday.
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