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?

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

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