Vyvoj optimalnich algoritmu pro selekci ridkych semimionovych B rozpadu v detektoru ATLAS

In this thesis we propose the trigger algorithm for the semimuonic rare B decay selection in ATLAS experiment and we study its performance using the Monte Carlo sample of $\Lambda_b\to\Lambda^0\mu^+\mu^-$. The cut optimisation has been performed in order to obtain the optimal cut values and the signal rate for the process was estimated. The feasibility and performance of the tag-and-probe method for the calibration of di-muon triggers is investigated, too. Effects of the systematic uncertainties of the method on the measurements of J/$\psi$ polarisation and the forward-backward asymmetry of $\Lambda_b\to\Lambda^0 mu^+\mu^-$ were studied.