Peak Value on ConvFFT Roofit

Dear all

Thanks in advance for your help. I want to ask ( I guess it has been already asked many times but I haven’t find a solution yet) how to get the Peak value of a convoluted pdf in Roofit?

I am making histograms like this

and I am trying to get back from the fitted function the peak value. I am doing something like:

RooFFTConvPdf pl(“pl”,“landau (X) gauss”,x,landau,gauss) ;
x.setVal(xpeak) ;
pl.getVal() ; // returns unormalized value = 511
pl.getVal(RooArgSet(x)) ; // returns normalized value = 0.211

but nothing gives me back something like 130 that I am expecting.

Any suggestions?

Thanks, George