[Halld-offline] HDGeant4 Meeting Minutes, May 18, 2021

[Mark Ito]

Friends,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_May_18,_2021#Minutes> 
and below.

   -- Mark

      ________________________________


    HDGeant4 Meeting, May 18, 2021, Minutes

Present: Alex Austregesilo, Tegan Beattie, Sean Dobbs, Mark Ito (chair), 
Igal Jaegle, Lubomir Pentchev, Simon Taylor, Beni Zihlmann

There is a recording of this meeting 
<https://bluejeans.com/s/Ac1OaTgcBKW/> on the BlueJeans site. Log into 
the BlueJeans site <https://jlab.bluejeans.com> first to gain access 
(use your JLab credentials).


      Review of minutes from the last meeting

We went over the minutes from the meeting on May 4th 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_May_4,_2021#Minutes> 
without much comment.


      FCAL Calibration

Igal reports that the PrimEx working group is going to develop a scheme 
to calibrate Monte Carlo in the same way as data is calibrated, using 
π^0 s. In this way they hope to help explain the effect seen by Andrew 
Schick, where the elasticity for Bethe-Heitler events comes out 4 to 5% 
lower than unity in the data. Lubomir applies an energy correction for 
electrons from 6 to 11 GeV in the J/ψ analysis, likely to compensate for 
the same effect.


      FDC Efficiency

Lubomir showed a plot demonstrating that there is not a lot of 
dependence on threshold in the shape of the hit efficiency as a function 
of DOCA. The overall level of efficiency does vary, but it may be 
adequate to use a representative shape for the efficiency and scale it 
based on comparison with data for use in simulation.


      Charged Hadrons and the BCAL

Tegan obtained a significant, if not overwhelming, yield on his 
simulation of a million events each for G3 and G4 on the JLab farm using 
using software from analysis launch version 38. He flashed several of 
the resulting plots from those posted on the DocDB 
<https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=4878>. 
He will contact Richard Jones to transmit the results and plan the next 
steps.

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