[Halld-offline] HDGeant4 Meeting Minutes, August 28, 2018

[Mark Ito]

People,

Please find the minutes below and by clicking here 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_August_28,_2018#Minutes>.

   -- Mark

_____________


    Minutes, HDGeant4 Meeting, August 28, 2018

Present:

  * *FSU: * Sean Dobbs
  * *JLab: * Thomas Britton, Mark Ito (chair), Simon Taylor, Beni Zihlmann
  * *UConn: * Richard Jones
  * *W&M: * Justin Stevens

There is a recording of this meeting <https://bluejeans.com/s/IGvQ6/> on 
the BlueJeans site. Use your JLab credentials.


      Announcement

Thomas reported a bug in mcsmear that has recently been identified and 
fixed. See Pull Request #9 for halld_sim 
<https://github.com/JeffersonLab/halld_sim/pull/9>. The BCAL smearing 
parameters were being used uninitialized. That resulted in random 
behavior, e. g., varying widths in energy resolution from run to run of 
the mcsmear executable. Recent simulations generated for comparison 
between HDG3 and HDG4 may have the disease.


      Review of notes from last time

We went over the notes 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_August_14,_2018#Notes>. 


  * The JANA_CALIB_CONTEXT-not-set warning that was recently added
    appears to be warning whether JANA_CALIB_CONTEXT is set or not.
  * The change in the treatment of the time-to-distance relation
    discussed last time has been implemented on a branch of halld_sim.
    Thomas and Simon are testing it. Once it has been merged to the
    master, Richard will have to re-implement the scheme in HDG4.


      Issues on GitHub

We reviewed the list of issues 
<https://github.com/JeffersonLab/HDGeant4/issues>. Justin entered a new 
one <https://github.com/JeffersonLab/HDGeant4/issues/65> last Friday 
where optical photons have inconsistent propagation distance vs. 
propagation time depending on whether or not they cross certain material 
boundaries. Richard will be looking into this one.


      pi0/eta -> 2g masses

Sean showed plots 
<https://halldweb.jlab.org/wiki/images/2/29/Sdobbs_HDG4_082818.pdf> 
showing a slight shift (5 MeV) in the location of the two photon 
invariant mass for neutral pions and eta's when comparing HDG3 with 
HDG4. The origin is unclear at present.

We agreed that, in principle, problems like these should not be solved 
by smearing parameters in mcsmear that depend on whether the simulated 
data is generated by HDG3 or by HDG4.

Retrieved from 
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  * This page was last modified on 28 August 2018, at 16:09.

-- 
Mark Ito, marki at jlab.org, (757)269-5295

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