RooSimPdfBuilder constraints in category splitting

[StephanH]

Hi @VukanJ,

I am not familiar with the SimPdfBuilder. With a quick look, I found that it’s apparently superseded by the RooSimWSTool. That reminded me of a different thread where RooCustomizer was the solution.
RooCustomizer

Check out my last answer in this post:

Combined Fits w/ RooSimWSTool

No code as I’m still trying to figure out if RooSimWSTool is the right tool for this job. I need to simultaneously fit a bunch of the same pdfs with a few key differences. I understand that the mean and sigmas can be changed in the workspace via category tagging. But the yield for the gaussians needs to be a RooFormulaVar that relates the yield of every gaussian to a common mass. I’m just wondering how to change a RooFormulaVar the same way you can set values via tagging or something? Or if tha…

Maybe this is what you were looking for.