[Halld-offline] HDGeant4 Meeting Notes, July 20, 2018

[Mark Ito]

Folks,

Find the notes below and here 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_July_20,_2018#Notes>.

   -- Mark

________________


  HDGeant4 Meeting Notes, July 20, 2018

Present:

  * *FSU: * Sean Dobbs
  * *JLab: * Alex Austregesilo, Thomas Britton, Mark Ito (chair), Justin
    Stevens, Simon Taylor, Beni Zihlmann
  * *Regina: * Zisis Papandreou
  * *UConn: * Richard Jones

There is a recording of this meeting <https://bluejeans.com/s/PCm4D/> on 
the BlueJeans site. Use your JLab credentials.


      Review of notes from last time

  * Notes
    <https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_July_6,_2018#Notes>
    were reviewed


      Review of first round of simulation results

  * Thomas showed list of plots
    <https://halldweb.jlab.org/gluex_sim/G3G4_Comparisons/ver01/>.
      o email announcement of plots
        <https://mailman.jlab.org/pipermail/halld-offline/2018-July/003259.html>
  * Much time spent discussion of one plot:

Prot 4 15 Hist Reconstruction.png 
<https://halldweb.jlab.org/wiki/index.php/File:Prot_4_15_Hist_Reconstruction.png> 


  * Sean: geometry could be the cause
  * Richard: would like help isolating problem to simulation or to
    reconstruction
      o Thomas will put together a plug-in to explore
  * Thomas: both FDC and CDC hits are missing
  * question: are truth hits along real track trajectory
      o can be explored with event viewer
      o Beni volunteers
  * This is an issue on GitHub
    <https://github.com/JeffersonLab/HDGeant4/issues/54>


      Other Issues

  * Maria Patsyuk reported overlaps in the geometry
    <https://groups.google.com/forum/#%21topic/gluex-software/VOnAjfCf3r4>
      o Richard will work on this
  * Richard: issues with roll-your-own event generators
      o interaction z and t are correlated by machine bunch structure
      o decay of long-lived particles can lead to double counting
        (parent and daughter particles both appear in final state)
      o [added in press] Richard wrote new wiki page describing best
        practices
        <https://halldweb.jlab.org/wiki/index.php/Guide_to_Monte_Carlo_event_timing_and_detached_vertices_in_HDGeant/4>.

          + There is a related issue on GitHub
            <https://github.com/JeffersonLab/HDGeant4/issues/55>
  * Sean added an additional plot on the time shift in FCAL showers
    issue <https://github.com/JeffersonLab/HDGeant4/issues/10>. He sees
    a difference in hit times vs. shower times.


      Meeting Time

No one objects to meeting on Tuesdays at 2 pm, every other week.

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  * This page was last modified on 21 July 2018, at 12:54.

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