[Rivet] submission of analysis ATLAS_2014_I1282447

[Andy Buckley]

Hi Kristin,

Thanks! I've copied in Roman L as the current ATLAS Rivet contact, and
James & Monica since I don't know if the system has changed at all with
the shift to the new PMG group.

Just to clarify, when you say "FSR must be turned off", do you mean that
*QED* FSR must be turned off? That should have less impact than
disabling QCD FSR, which I really hope isn't what you meant, but is
still a bit against the Rivet ethos.

Assuming that you do mean QED FSR, I thought that all ATLAS SM EW
results were now meant to use dressed leptons, plus Born ones if
necessary -- in existing EW measurements such as the Z pT and phi*
observables, and even the Z underlying event, we only implemented the
dressed version in Rivet because there isn't any portable definition of
Born leptons. Requiring that no QED FSR is enabled is one way to force a
portable Born definition, but a) it means this analysis can't be used in
the same MC run as other 7 TeV pp W analyses, and b) I guess that matrix
elements containing higher-order QED corrections are also not usable
with this analysis, since the _ME_ is then providing the sort of QED
correction that you're labelling as "FSR", and there really is no "Born"
W to compare to?

If all this is unavoidable, then we just deal with it and of course any
analysis code is better than none, but since the MC/theory technology is
ever-improving if this analysis can be made more future proof using the
existing data then now is the time to do so.

Thanks again,
Andy



On 22/11/14 23:37, Kristin Lohwasser wrote:
> Dear all,
> 
> herewith I would like to submit ATLAS analysis ATLAS_2014_I1282447
> (W+charm production)
> 
> Two things to note:
> -- some part of the measurements are ratios (also to Winclusive
> production), this is a bit harder to implement and not possible in one
> go, therefore I have put a description at the start of the .cc file
> (thinking about it, also the W+/W- histograms probably will work only
> for post-processing in the case of generators only producing one
> charge). [however the most interesting plots can ge gotten out straigh
> away]
> -- THE CODE SHOULD BE RUN WITH FSR TURNED OFF!!!
> 
> It has been tested with the ATLAS version of Rivet 2.x.
> 
> Please let me know, once this is uploaded to your website.
> 
> Best
> Kristin
> 
> 
> 
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-- 
Dr Andy Buckley, Royal Society University Research Fellow
Particle Physics Expt Group, University of Glasgow / PH Dept, CERN