[Rivet] Normalisation of histograms in MC_Z* analyses

[Andy Buckley]

I've fixed these on the trunk now. Thanks for the reports -- no idea
what I was thinking.

Andy


On 16/04/15 13:45, Frank Siegert wrote:
> Hi all,
> 
>> when running some of the MC_Z* analyses, I observed differences in the way
>> histograms are normalised. E.g. in the analysis MC_ZJETS all histograms
>> inherited from the MC_JetAnalysis are normalised using  Scale(hist,
>> crossSection()/sumOfWeights()) which in my opinion seems to be the correct
>> approach. On the contrary, the two histograms Z_jet1_dR and Z_jet1_deta are
>> normalised using normalize(hist, crossSection()/picobarn) which can be quite
>> misleading in my opinion.
> 
> I agree, these histograms should definitely be using scale(hist,
> xs/sumOfWeights()) and not normalize. This also used to be the case,
> but was changed a while ago:
> https://rivet.hepforge.org/trac/changeset/8c96bd39e1f006b308af846dfd2dac361f11aca5#file26
> 
> Andy, do you remember why?
> 
>> Also, the description of MC_ZJETS (data/anainfo/
>> MC_ZJETS.info) is a bit outdated as e.g. the Z mass distribution is not
>> available.
> 
> Right, that has been moved to the MC_ZINC when the analyses were
> split, and I must have forgot to update the descriptions, sorry!
> 
> Cheers,
> Frank
> 


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