[Halld-offline] HDGeant4 Meeting Minutes, August 28, 2018
marki at jlab.org
Tue Aug 28 16:11:48 EDT 2018
Please find the minutes below and by clicking here
Minutes, HDGeant4 Meeting, August 28, 2018
* *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.
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
* 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
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.
* 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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