[Primexd] PrimEx-eta Weekly Meeting Cancellation

[gasparan at jlab.org]

  Sorry, I am in airports and not able to connect to the meeting,
 Ashot


> Dear All,
>
> As we have no presentations planned for today’s meeting, and due to the
> proximity to the July 4th holiday, I propose that we cancel today’s PrimEx
> meeting in order to focus our time and efforts on producing some results.
> Please let me know if there’s any objection to this, or if anyone has a
> pressing matter to discuss.
>
> As for a brief update to add to last week’s meeting:
>
>   *   Richard updated the e+e- pair production generator that he built
> into hdgeant4 for atomic nuclei. Using his generator, the cross section
> for pair and triplet production on Beryllium is within 5% of the NIST
> tables. I am currently producing a large sample of pairs to replace the
> previous simulation I used in the Compton analysis, which I expect will
> provide a milder dependence of the extracted Compton scattering cross
> section on the elasticity cut. I am also running a comparison using just
> geant4 to produce e+e- pairs by shooting photons on the target and only
> recording the events where the first interaction in the target was e+e-
> pair production. I will show this comparison next week when I have more
> results.
>   *   Igal is working to correct a number of technical issues in the
> simulation for the Lead target (CPP data). Whenever those simulations
> are ready, we will be able to compare the pi0 angular distribution
> between data and simulation in order to study/tune the angular
> resolution of the FCAL.
>
> Best Regards,
> Drew
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