Reconstructing semileptonic top-pairs using different strategies

Since at the LHC are taking place $p\bar{p}$ collisions in the center of ATLAS detector with energies of $\sqrt{s} = 13$ TeV, the production rate of top quarks is higher than ever. Due to its massive nature, top quark is the last discovered quark and nowadays, with the potential given by the LHC, many top production processes are accessible for precise and extended measurements of its properties. Besides of research interest as individual, better understanding of tops' nature is important in searches for new particles because SM processes involving top quark production, consist a very strong background for new physics. One of the most interesting top production processes, is the semileptonic $t\bar{t}$ channel, the study of which could be challenging. This project focuses on the comparison of 3 different top reconstruction techniques using jets given by 2 different jet reconstruction algorithms. This report will provide reader with information concering why a good MET guess is decisive, which reconstruction technique seems to be better for unfolding this process and if, at the end, the accuracy of $t\bar{t}$ reconstruction strongly depends on jets' reconstruction accuracy.