[Rivet] histogram normalization for a CMS analysis

[Andy Buckley]

On 01/11/11 15:16, Albert Knutsson wrote:
> Dear Rivet developers,
>
> we are about to finish a Rivet plugin for "Measurement of BB Angular
> Correlations"
> http://cdsweb.cern.ch/record/1329400/files/BPH-10-010-arxiv.pdf
>
> We are a bit unsure about how to do the normalization of the MC in the
> Rivet plugin.
>
> In the publication only a shape comparison is made: The MC is normalized
> to the data in a certain region, and a 47% common systematic
> normalization error is not included on the data points.
>
> Would you prefer to have the MC in the rivet plugin normalized as in the
> publication (for shape comparison)?
>
> or
>
> Would you prefer to have a MC cross-section prediction from the plug-in?
> 47% uncert extra uncert then need to be added on the points in the data
> aida-file.

Hi Albert,

Our "policy" is (at least for now) to output the MC normalizations from 
Rivet analyses -- the user is then free to do "post-processing" 
normalisation changes with the method of their choice. I think it's 
probably good enough to say explicitly that there should be an extra 47% 
uncertainty in the Description field in the .info file.

As with everything else, this will probably be reviewed when we finally 
get our improved histogramming interface into action!

Hope that helps!
Andy

-- 
Dr Andy Buckley
SUPA Advanced Research Fellow
Particle Physics Experiment Group, University of Edinburgh

The University of Edinburgh is a charitable body, registered in
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