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Normalization of RooSimultaneous

Dear experts,

I have been working on a plot where I want to display the background pdf of my model and its 1sigma error band as well as a curve with an artificial signal. I have been facing two different problems (see in the figure attached):

  1. The background and signal curve do not have the same normalization: the bigger the signal, the lower the signal curve lies. I would expect the signal curve to be in the same position as the background curve.
  2. The error band of the background curve seems to be zero where the signal would be expected. I would expect the error band to have at least some width at that position.

Here is an example of what I would rather like to achieve:


Iā€™m attaching the dummy code that leads to the initial result:
sinal_plot_dummy.C (8.8 KB)

Thank you very much in advance for trying to help!

I think @moneta or @jonas can give you some hints

Thanks! I hope someone will be able to help.


I have tried what is suggested in Normalization uncertainties in VisualizeError - #4 by bibsession and it does not work in this case probably because the plots are projections from a RooSimultaneous pdf.
For a simple case adding the Normalization option works fine.
I will re-open https://sft.its.cern.ch/jira/browse/ROOT-9971 to track this problem


1 Like

Thank you, Lorenzo!

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