Ph.D Thesis


Ph.D StudentAviad Roitgrund
SubjectThe Left-Right Symmetric Model as an Extension of the
Standard Model: Implications for the LHC
DepartmentDepartment of Physics
Supervisors Professor Emeritus Eilam Gad
Dr. Bar Shalom Shaouly
Full Thesis textFull thesis text - English Version


Abstract

We present an implementation of the manifest left-right symmetric model (LRSM) in FeynRules. The different aspects of the model are described alongside the corresponding elements of the model file. We performed a wide range of validation tests for the model, confronting it with known results in the literature. The model file can be easily translated to matrix element generators such as MadGraph, CalcHep, Sherpa, etc. The LRSM implementation presented in this work can serve as a useful tool for the search for new physics at the LHC era. Indeed, as a demonstration, we use the model implementation file to investigate the widely studied lepton number violating (LNV) signal of like-sign dileptons and two jets at the 14 TeV LHC, i.e., pp à e± e± jj, and show that, for an integrated luminosity of 300 fb-1, the right-handed boson W?R and the right-handed electron neutrino Ne can be observed if their masses are smaller than 5.2 TeV and 3.6 TeV, respectively. Apart from direct searches for the LRSM, we also study its effects on precision electroweak data (PEWD) observables such as ∆r, δρ and the W-boson mass. Indeed, we show that such indirect probes of the LRSM can be useful in constraining its free parameter space. We also study the contribution of the LRSM doubly-charged Higgs δR?±± to the dilepton e± e± jj signal and find that the maximal sensitivity to δR?±± is obtained for M (δR??±± ) ≈ 1.3 TeV with a luminosity of 300 fb-1..