- #1
Floyd_13
- 10
- 3
I'm currently reading various papers on the violation of Lepton Flavour Universality in rare B-decays and I would appreciate some help in understanding the methodology for measuring the ratios in these decays.
Here is a quote from a recent paper from the LHCb collaboration (p.5):
My question is how exactly are the yields extracted from the fits performed on the mass data points using maximum likelihood estimations? Does this mean that the fitted function has to be a function of the yield N? If yes, how is this achieved?
Here is a quote from a recent paper from the LHCb collaboration (p.5):
An unbinned extended maximum-likelihood fit to the m(K+e+e−) and m(K+µ+µ−) distributions of nonresonant candidates is used to determine RK [the ratio]. In order to take into account the correlation between the selection efficiencies, the different trigger categories and data-taking periods are fitted simultaneously. The resonant decay mode yields are incorporated as constraints in this fit, such that the B+→K+µ+µ- yield and RK are fit parameters.
My question is how exactly are the yields extracted from the fits performed on the mass data points using maximum likelihood estimations? Does this mean that the fitted function has to be a function of the yield N? If yes, how is this achieved?