Supersymmetric Top Quarks and Systematic Uncertainties

In this project, the most important kinematic variables of ttbar events will be studied at truth level. The behaviour of each distribution by changing the choice of the matrix element or showering generators or the choice of renormalisation or factorization scales will be investigated.The aim of this project is to identify those variables that show large difference for different generator or scales choices, and therefore are characterized by large theoretical uncertainties, and provide useful recommendation to the analysis with a dominant ttbar background.