Dear RooFit experts,
The mean value from pull distribution shifted from 0 when I used the RooCBShape as a pdf model, however it seemed normal when RooGuassian was used as a pdf model.
I tried a lot of ways to solve including fixed the tail parameters like alpha, n, unfotunately, it remains. Could you tell me how to solve the above problem. Thank you much for your help.
The code can be seen in the attachment. Thank you so much for your reply.toymc_test.py (1.7 KB)