[Rivet] setSumOfWeights

[Andy Buckley]

Hi Silvan,

I was just following up on this, and we do have setCrossSection methods on Run, AnalysisHandler, and Analysis: are you not able to use these? I may have missed something: can you let me know what the issue is, please?
Thanks,
Andy

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

On Mar 15 2018, at 9:47 pm, Silvan Kuttimalai <silvan at slac.stanford.edu> wrote:
>
> Ok, then we will implement it in this way. The only caveat I can see is
> that the cross section error cannot be set externally. It's probably not
> huge issue but the error on the cross section shown in the output of
> "MC_XS" would be off, for example. Would you be able to add such a function?
>
> Best,
> Silvan
>
> On 03/15/2018 01:16 PM, Andy Buckley wrote:
> > 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
> > _______________________________________________
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> > Rivet at projects.hepforge.org
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>
>

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