Dear RooFit experts,
I have the following problem I would like to submit to your attention:
I would like to make a 2D-fit to mass and phi angle variables
The likelihood is: nS * (f*P1(m) + (1-f)P2(m)) * F(phi) + nBP3(m)
The fit is extended maximum likelihood:
- nS is the yield of the signal
- nB is the yield of the background
- f is the fraction of the probability P1
- 1-f is the fraction of the probability P2
- F is the pdf for the phi angle
- P3 is the pdf for the background
I would like to fit the data in subrange of the mass, let’s call it “massSub” AND I would like to fit the data in subrange of the phi angle let’s call it “phiSub”
My problem is that I don’t know how to tell RooFit how make the fit in these sub-ranges and properly plot the projections. I’m confused about how to use:
Range(…)
SumCoefRange(…)
SplitRange(…)
fixCoefRange(…)
(A) Can you please tell me how would you configure the fitTo(…) method in order to properly execute the fit I just described ?
(B) Can you please tell me how would you plot the mass projection superimposing data and the fit result ?
© Can you please tell me how would you plot the phi angle projection superimposing data and the fit result ?
Thank you very much.
Kind Regards,
- Mauro.