Search for new physics with razor kinematic variables at √s=13 TeV using Ultra Legacy samples

In this thesis, a detailed analysis of Supersymmetry (SUSY) using the razor kinematic variables with the Run-2 Ultra-Legacy (UL) dataset is presented. By exploiting the distinctive kinematic fea-tures of SUSY events, the razor analysis allows for the discrimination between signal and background processes. The UL dataset provides a comprehensive collection of data from proton- proton collisions at √s = 13 TeV, recorded by the CMS detector with an integrated luminosity of 137 fb−1. The sensitivity achieved with the UL dataset provides valuable insights into the potential existence of new physics beyond the Standard Model. The analysis strategy involves event selection based on specific razor variables, MR and R2. Additionally, dedicated background estimation techniques and systematic uncertainty studies are performed to ensure accurate predictions of the Standard Model backgrounds. The results are interpreted in the context of simplified SUSY models, focusing on producing gluinos and squarks decaying to various final states for both RPV and RPC cases.