Study of Sensitive Variables for dim-8 EFT Operators in Same Charge WWjj Scattering

The weak vector boson scattering (VBS) at the Large Hadron Collider provides an excellent source of information on the structure of quartic gauge coupling and possible effects of physics beyond the Standard Model (SM) on electroweak symmetry breaking. By introducing Effective field theory (EFT) operators of higher mass dimension into a so called effective Lagrangian a wide variety of Beyond SM physics can be studied. For the scattering of two same sign 𝑊± bosons the lowest important operators are of dimension 8. This thesis investigates the sensi- tivity of different variables to dim-8 EFT operators. Monte Carlo Simulations based on the Run 2 proton-proton collisions with VBS signature as input data are used. After identifying the most sensitive variables, a bin optimization algorithm is performed. Clipping, the rec- ommended method for the unitarisation of Beyond Standard Model effects, is introduced and applied to different center-of-mass energies of the 𝑊±𝑊±-scattering. Using a fitting frame- work, limits on the coupling coefficients of the EFT operators are extracted. By comparing the limits to theoretical unitarity bounds, a range of validity with regards to unitarity is identified for the individual EFT operators.