How to get the error of the maximum of a RooFFTConvPdf?

Roofit and RooStats
1

Dear all,

I would like to know if it’s possible to get the error of the maximum of a RooFFTConvPdf.
My fit fonction is a convolution of a Landau and a Gaussian distribution.
I get the maximum value with this code :
TF1 * f = pdf->asTF( RooArgList(*x) );
double xmax = f->GetMaximumX();

Do you have any ideas?

Thanks in advance for your help,
Louis