Reversed Crystal Ball function fit

Dear All,

I would like to fit a histogram with a reversed Crystal Ball function : having one tail on the higher rather than the lower side.
Is there anyway to do this in Roofit?

Hi,
as fas as I known you have to use a negative value of the transition point (alpha) between the gaussian and the power law tail

1 Like

Hey,

It worked perfectly with the negative value of alpha. Thank you for the tip :slight_smile:

Simon