A decay of a D0 to charged kaons and leptons

Plot the mass distribution of a neutral $D^0$ which decays to a combination of $K^+\pi^-$ or $K^-π^+$ :

$D^0 \longrightarrow K^+\pi^- \quad\text{or}\quad D^0 → K^-\pi^+$

You will find a peak at a mass of $D^0$ at 1.86 $\mathrm{GeV}/c^2$

Probability for a production of $D^0$ is very small.

You will have to process at least 100.000 events.

Exercise 7