Dear Rooters,
I cannot fit an histogram with a Breit Wigner. I created a function with
two parameters ant fited the histogram:
TF1 *bw = new TF1("bw","[0]/((x-[1])*(x-[1])+[0]/4)",0,1.4);
h->Fit("bw");
but the fit gives a line in the bottom of my plot and bad parameters.
I also created a C++ function which initialize the TF1 object (like in
the manual with the Lorenzian+background example (pages 66-67) but I get
the same result.
Then, I redefined the TF1 Object with 4 parameters:
TF1 *bw = new TF1("bw","[0]/((x-[2])*(x-[3])+[1]/4)",0,1.4);
h->Fit("bw");
The fit look great in the screen, except that the parameters 0 and 1 or
2 and 3 are totally different.
I use Root 3.0 on a Linux machine (RedHat 6.2)
Thanks for your help,
Antoine Cazes
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