Some material for the discussion today
https://dl.dropboxusercontent.com/u/45977020/ProfGENIE_20161122.pdf
https://dl.dropboxusercontent.com/u/45977020/GENIEv3_characterization_v1.0.pdf
cheers
Costas
On 21 Nov 2016, at 23:35, Costas Andreopoulos <[log in to unmask]<mailto:[log in to unmask]>> wrote:
Yes, of course we could do that, if someone is willing to invest the effort.
Our core mission is to deliver improved versions of the generator and generator tunes.
In comparison, supporting generator-related analysis tasks in experiments is secondary.
The latter should not interfere with the former. So I would like to avoid resistance in including in our tunes parameters
which are non-reweightable in principle (or parameters for which reweighing code has not been written yet) on the basis
that uncertainties can not be propagated using event reweighing.
cheers
C
On 21 Nov 2016, at 23:02, Gabriel Nathan Perdue <[log in to unmask]<mailto:[log in to unmask]><mailto:[log in to unmask]>> wrote:
On Nov 21, 2016, at 2:47 PM, Costas Andreopoulos <[log in to unmask]<mailto:[log in to unmask]><mailto:[log in to unmask]>> wrote:
The GENIE reweighting needs a major upgrade to properly initialise itself with configuration data stored in the event file it reweighs. Otherwise, it is all too easy for differences to creep in. I always wanted to do this upgrade, which is very substantial, but i do not see the motivation for this any more. Professor does not need reweighting, so our tunes won't depend critically upon it. So it is certain that there will be a increasingly widening gap between the amount of tuning and error estimation done in GENIE, and the amount of it that can be supported via reweighting. Users need to develop own solutions for their analysis needs.
This is all true, but the re-weighting facilities are a premier feature in GENIE and we should strongly consider continuing to modernize and support them at a high level.
Gabriel Perdue
Associate Scientist
Scientific Computing Division
Fermi National Accelerator Laboratory
PO Box 500, MS 234, Batavia, IL 60510, USA
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