Hi, To be more specific, the disabling FSR is concerning QED only and it is to get born level electrons. I agree it is unfortunate,it was not my decision and should be changed for the next round of w+c analysis. I tried to tune the selection such that it is very close to born,it should be 1-2% accurate judging from 10000 events cutflow comparing the born level to the rivet code. Best Kristin <div class="gmail_quote">Am 23.11.2014 18:56 schrieb "Andy Buckley" <<a href="mailto:andy.buckley@cern.ch">andy.buckley@cern.ch</a>>: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">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 > > > > _______________________________________________ > Rivet mailing list > <a href="mailto:Rivet@projects.hepforge.org">Rivet@projects.hepforge.org</a> > <a href="https://www.hepforge.org/lists/listinfo/rivet" target="_blank">https://www.hepforge.org/lists/listinfo/rivet</a> > -- Dr Andy Buckley, Royal Society University Research Fellow Particle Physics Expt Group, University of Glasgow / PH Dept, CERN </blockquote></div>