Search for dark matter: Dark photon and Z' boson
LE3 .A278 2014
Bachelor of Science
The presence of dark matter suggests the possible existence of new particles, such as weakly interacting massive particles (WIMPs). Based on Standard Model (SM), new elementary particles can be introduced as mimics of SM particles with di erent physical parameters, such as mass and coupling. In this research a hypothetical pho- ton mimic (dark photon) and a Z boson mimic (Z') were introduced. Depending on the consistence between theoretical prediction and the experimental measurements, exclusion plots of e +e+ ! + + and e +e ! e +e channels were made to represent possible physical parameters for these new particles. Next to the Leading Order (NLO) level Feynman calculus is introduced to provide exclusion plots with higher precision. Renormalization and soft Bremsstrahlung are introduced to solve ultraviolet and inferred divergences. All calculations were oper- ated on Mathematica 5.2 platform. Exclusion plots were generated on Mathematica 8. Results of the exclusion plots have shown great consistence between two di erent channels for each new physics particle. However, further research is needed to discover dark photon and Z' boson.
The author grants permission to the University Librarian at Acadia University to reproduce, loan or distribute copies of my thesis in microform, paper or electronic formats on a non-profit basis. The author retains the copyright of the thesis.