A sensitivity study of the B${}^0$→K${}^{\ast }$(892)${}^0$μ${}^{+}$μ${}^{-}$ decay at the Belle II experiment

Although the Standard Model of particle physics is well established by many experiments some phenomena are observed that cannot be explained by the Standard Model alone. Furthermore recent evaluations of experimental data yield results deviating from the Standard Model's predictions with a significance of up to 4$\sigma$ - 5$\sigma$. The B${}^0$→K${}^{\ast 0}$l${}^{+}$l${}^{-}$ decay is one of those where new physics might arise. The Belle detector is being upgraded in order to achieve more precise measurements of many variables and to cope with the higher luminosity of the superKEKB collider. In this thesis the sensitivity of the B${}^0$→K${}^{\ast 0}$μ${}^{+}$μ${}^{-}$ decay at the new experimental setup, with the upgraded Belle II detector and superKEKB collider, is analyzed using data from Monte Carlo simulations of the Belle II group. The studies show that, even for the integrated luminosity of the Belle dataset, a higher amount of signal events and better statistical significance can be expected of the new setup. Even more so for a final integrated luminosity, which is 50 times higher than that of the previous experiment.