Speaker
Description
We present a measurement of the Branching Fraction $\mathcal{B}(B^+\rightarrow \overline{D^0} K^+)$ using $186.75 \,\, \text{fb}^{-1}$ of $\Upsilon(4S)$ Belle II data gathered from 2019 to 2021. To extract the signal yield, we fit over reconstructed events corresponding to $B^+ \rightarrow \overline{D^0} K^+$ with $\overline{D^0} \rightarrow K^+ \pi^-$ which are distributed over the $beam$ to $B$ energy deviations at center-of-mass, $\Delta E$. The beam energy furthermore constrains the invariant mass of the $B$ products.
Our focus lies on the appropriate fitting analysis methods used on a Monte Carlo simulated event dataset and how its analysis can serve to obtain a reliably unbiased measurement of a branching fraction from a real dataset.
