[Rivet] setSumOfWeights

[Andy Buckley]

That seems simpler to me! No obvious issues: this way I think it's guaranteed that the sum(w) and sum(w**2) terms will both be accurate, and they should combine together consistently when you merge.

Cheers,
Andy

Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
Particle Physics Experiment Group, University of Glasgow

On Mar 15 2018, at 6:49 pm, Silvan Kuttimalai <silvan at slac.stanford.edu> wrote:
>
> Hi Andy,
> thanks for the quick response! If I understand the issue correctly, then
> we might just as well re-set the total cross sections for our
> sub-contributions and leave the sum of weights untouched. To me this
> even seems like to conceptually better way of doing it. I just ran a
> test and it appears to work for us. Would you see any issues in this
> approach?
>
> Best regards,
> Silvan
>
> On 03/15/2018 03:55 AM, Andy Buckley wrote:
> > Hi Silvan,
> >
> > The issue is that more than the sum of weights alone is needed now.
> > Can you also supply the sum of squared weights? If so, I'll add an
> > extra argument and an implementation to version 2.6.1.
> >
> > Andy
> > *Dr Andy Buckley, Lecturer / Royal Society University Research Fellow*
> > Particle Physics Experiment Group, University of Glasgow
> >
> >
> >
> > On Mar 14 2018, at 11:45 pm, Silvan Kuttimalai
> > <silvan at slac.stanford.edu> wrote:
> >
> >
> > Dear Rivet Authors,
> > we noted that in Rivet version 2.6.0 the method
> > AnalysisHandler::setSumOfWeights is not present anymore. We used this
> > method in Sherpa in order to automatically split up our rivet analysis
> > output by contributions from H and S events in MC at NLO for example. To
> > get the normalization of these sub contributions right, we set the sum
> > of weights explicitly at the end of the run. Is there an
> > alternative for
> > this procedure in the new version?
> >
> > Many thanks,
> > Silvan
> > _______________________________________________
> > Rivet mailing list
> > Rivet at projects.hepforge.org
> > https://www.hepforge.org/lists/listinfo/rivet
>
>

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