Hello,
I made pdf for Relative Breit-Wigner using RooClassFactory::makePdf().
Then I have tested it like this.
{
gSystem->Load("libRooFit");
using namespace RooFit;
gSystem->Load("RooRelBW_cxx");
RooRealVar x("x", "x", 1, 3);
RooRealVar mass("mass","mass",1.530, 1.0, 3.0);
RooRealVar width("width","width",0.336, 0.2, 0.4);
RooRealVar mdau1("mdau1", "mdau1", 0.9382720);
RooRealVar mdau2("mdau2", "mdau2", 0.139570);
RooRealVar Lmin("Lmin", "Lmin", 1);
RooRealVar hp("hp", "hp", 0);
RooRelBW relBW("relBW", "relative Breit-Wigner", x, mass, width, mdau1, mdau2, Lmin, hp);
RooAbsData* data = relBW.generate(x, 10000);
RooFitResult* r = relBW.fitTo(*data, Save());
RooPlot* xframe = x.frame();
data->plotOn(xframe);
relBW.plotOn(xframe);
relBW.paramOn(xframe, Format("NEU", AutoPrecision(4)));
xframe->Draw();
//r->Print("v");
} FCN=-1260.83 FROM MINOS STATUS=SUCCESSFUL 39 CALLS 80 TOTAL
EDM=2.233e-05 STRATEGY= 1 ERROR MATRIX ACCURATE
EXT PARAMETER PARABOLIC MINOS ERRORS
NO. NAME VALUE ERROR NEGATIVE POSITIVE
1 mass 1.53006e+00 2.03063e-03 -2.02618e-03 2.03544e-03
2 width 3.30644e-01 5.53109e-03 -5.45690e-03 5.61460e-03
ERR DEF= 0.5Why is NLL(FCN) minus?
P.S. Are there some parameters to judge the fit quality like chi^2/ndf and C.L. in mn_fit?
RooRelBW.cxx (3 KB)
RooRelBW.h (1.69 KB)