[Rivet] Phone/Skype meeting

[Jonathan Butterworth]

Hi all,

I can't make 12th. 13th would ok and I would like to join if possible. 
Any chance?

Frank Siegert wrote:
> Andy Buckley, Thursday 01 October 2009:
>> Since Hendrik is moving to Durham at the moment, and some of us
>> including me will be at an Atlas week next week, I suggest that we have
>> a DESY phone conf. or Skype (preferences?) meeting on the afternoon of
>> Monday 12 October.
> 
> 12 October is fine with me. I'd prefer Skype (poor Durham Uni doesn't have 
> outgoing phone lines in PhD offices).
> 
>>   * Properly addressing the cross-section/normalisation issue
>> (hopefully I'll have fixed the bug in extracting the x-sec from HepMC
>> by then!). I would really like to remove all the hard-coded cross-secs
>> from Rivet before we next use it "seriously".
> 
> I don't know if you saw my comment to #323: This isn't actually a bug, but 
> simply a missing feature in the HepMC python interface, namely the 
> inability to access the new (2.05) cross section object. I guess it's 
> quite trivial to fix for somebody who knows the python interface stuff, so 
> ... unfortunately (for you) I'm not going^w^w^w you'll have to be 
> supplying all of it ;)

On what we are trying to achieve here - what JetWeb used to do was treat 
normalisation as a free parameter for a given process, but have a single 
normalisation per process rather than per plot. This makes sense for LO 
generators where the normalisation is not really reliable anyway.

I don't think we want to start doing any fitting in rivet, but I do 
think having the facility to provide a single normalisaton per sample 
rather than per plot is the first place to start, and then to make this 
available to professor etc for tuning.


>>   * Getting some manpower on the histogramming upgrade for the
>> next-to-next release. I think we need to have a good think about how
>> much of the histogramming normalisation, chopping, scaling, etc. should
>> be inside Rivet and how much should be in (Python) post-processing
>> scripts.
> 
> I would definitely be willing to contribute to that and would be very 
> happy if we discussed especially the question of how much of the 
> normalisation should be done a posteriori. This is in particular relevant 
> for me because I want to merge (equivalent!) generator runs to increase 
> statistics.
> I have also worked on and used the plotting tools quite a bit recently in 
> different use cases, so I have a fairly clear perception of what I would 
> want it to work like (much of which is already possible, but a little bit 
> cumbersome).
> What about the actual histogramming package (independent of Rivet), is it 
> already in good shape? What is still needed and how efficient/useful would 
> you expect it to be if somebody else helped working on it?
> 
>> PS. One *very* important issue: I'd like to make our next release
>> "1.2.0" rather than "1.1.4". Two reasons: first, there is a major and
>> incompatible change to the plugin system; second, our current use of
>> the release numbering is so conservative that I fear it makes us look
>> like a bunch of lazy "slow patchers", while other HEP tools rocket
>> through the version numbers like there's no tomorrow. Just psychology,
>> but I think no less important for that ;) Any opposition/comments? (I
>> would expect the SHERPAs on the list to have some comments about
>> conservative version incrementing!)
> 
> Very much in favour of 1.2.0. :)

me 2


> 
> Frank
> 
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-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Prof. Jonathan Butterworth,              http://www.hep.ucl.ac.uk/~jmb/
Physics and Astronomy Department                  Tel: +44 20 7679 3444
ATLAS, CERN                                       Tel: +41 22 76  72340
University College London                 Gower St, London WC1E 6BT, UK
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