ma5_expert normalization

[annaprzybyl]

Question

Hello!

My question has to do with the ma5_expert plugin available for MadAnalysis5. I am imposing a cut that is not possible to do in the normal mode of MadAnalysis5, which is why I am currently learning expert mode. When I use the ma5_expert plugin to create histograms (following the instructions here), I see that the normalization is messed up.

Below is an example of the problem. I generated an analysis in the normal mode of Madanalysis5 with a (normal mode) cut, and then plotted the same plots using the ma5_expert plugin. I normalized to the same luminosity and set the cross section to be the same in each case. Before imposing any cuts the results look the same (the root rendered plot is MadAnalysis5 normal mode and the python rendered plot is expert mode ma5_expert):

But after imposing the cut, the results no longer match:

Is there a way to normalize plots using the ma5_expert plugin with cuts?

[jackaraz]

Hi @annaprzybyl, you can set weight normalisation for each histogram as follows

h = ma5.histogram.Collection("histos.saf", xsec=..., lumi=...)
my_hist = h["my_hist"]
my_hist.weight_normalisation = 3.

Hope it helps.

Cheers