טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
Ph.D Thesis
Ph.D StudentGemintern Alexander
SubjectConstraints on "New Physics" Parameters from Current and
Future Experiments
DepartmentDepartment of Physics
Supervisor Professor Emeritus Gad Eilam


Abstract

The thesis is devoted to the supersymmetry (SUSY) without R-parity. R-parity is the multiplicative quantum number equal to 1 for all the particles required by the Standard Model (SM) and to -1 for all the new particles required by SUSY. This means that in the SM R-parity is conserved. If it continues to be the case in SUSY, then it would have physical consequences. For example, the new particles required by SUSY would come necessarily in pairs, and the lightest of them would be stable. However, the situation may be different if R-parity is violated. In this case, new particles may be singly produced, and the LSP is no more stable. In the thesis, three types of R-parity violating processes are studied. The first one is the decay of the top quark into the charmed one and the lightest Higgs boson (SUSY requires several Higgs bosons to exist). This process is tiny in the Standard Model, and appears to be considerably enhanced in SUSY, both with and without R-parity. The second one is the decay of the heavier lepton into the lighter one and two photons. To treat this process, new diagrams were elaborated which make this kind of processes not merely a correction to the one-photon ones. The third process studied in the thesis is the decay of the bottom quark into the strange one and two photons. It can proceed either as an inclusive decay of the B boson or as an exclusive decay of the Bs boson. Here the diagrams mentioned above are elaborated as well.