טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentNatalia Shuhmaher
SubjectProbing Fundamental Physics Using B Decays
DepartmentDepartment of Physics
Supervisors Professor Emeritus Gronau Michael
Mr. Grossman Yuval


Abstract

The main aim of this thesis is to investigate what can be learned from decays where the D meson is observed in several decay modes. These channels, as other B decays, are sensitive to CP violating parameters. Therefore, they can be used for testing the Standard Model, currently the best model for Nature's laws. Further tests are required to verify its predictions and extend the picture to higher energies. We present a new method, which shows that the CP violating angle can be completely determined in the range , using only untagged decays. Compared to known methods that use tagged decays, our method makes use of events that cannot be tagged or even events that are mis-tagged, regaining a significant part of the sensitivity lost due to the low tagging efficiency. In order to reduce the uncertainty in , we suggest combining information from and from untagged decays, where the D meson is observed in common decay modes. Both two and three body D decays are explored. The formalism for time dependent decays where a D meson is observed in a three body final state is worked out as well. In the high statistic limit these measurements provide enough information for fitting all of the weak phases and resolving the two-fold ambiguity of ,. Further reduction of the statistical error can be obtained by assuming isospin symmetry and by neglecting an annihilation contribution in , which allows for reducing the number of hadronic parameters when information from charged and neutral B decays is combined.