[Rivet] Atlas ET flow Rivet routine

[Hendrik Hoeth]

Hi Peter,

I'm not familiar with that analysis, so I can only provide general
guidance. We'd like to have all histograms normalised in the same way
the published data is. If the published data histogram is normalised to
some arbitrary number (e.g. 1), then there is no other option for the MC
histograms. If a histogram is showing a (differential) cross-section,
then we'd like to have it normalised that way. The Monte Carlo
cross-section is available in Rivet, so the typical line in the
finalize() method would be something like
scale(_h_W_pT, crossSection()/sumOfWeights());

The issue of merging runs will soon be solved. The next Rivet release
(this month) will be the last release based on the current histogram
system. Future releases are based on a different histogramming backend
that supports proper merging of runs.

I hope that helps.

Cheers,

    Hendrik

-- 
Man is the best computer we can put aboard a spacecraft, and
the only one that can be mass produced with unskilled labor.
                                        -- Wernher von Braun