Better limit by adding one more systematic

Roofit and RooStats
1

Hello,

I have two workspaces where one has one more systematic. While calculating the limit with toys using the StandardHypoestInvert tool: Sign in to CERN. I have a better limit with the workspace that contains one extra systematic. Do you know how this can be explained, please? I noticed the same effect with the asymptotic limit too.
Here are the two workspaces:
withSyst.zip (164.8 KB)
withoutSyst.zip (159.9 KB)
I run the asymptotic limit using this code:
runAsymptoticsCLs.C (53.3 KB)

Thanks a lot in advance.

Best,

Diallo.

2

Hi @diboye; maybe @moneta can help here.

Cheers,
J.

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