Ph.D Thesis

Ph.D StudentSurujon Ze'ev
SubjectPhenomenology beyond the Standard Model
DepartmentDepartment of Physics
Supervisors PROF. Yael Shadmi
MR Yuval Grossman
Full Thesis textFull thesis text - English Version


In this thesis we explore extensions of the Standard Model and discuss their phenomenological consequences.   In particular we study the following four directions of research.

We begin by proposing a new way to place an experimental bound on Lorentz violating interactions.   Exploiting the strong dependence of dispersion relations on Lorentz invariance, we suggest using pions from cosmic rays, as well as an on going experiment at Brookhaven, for bounding the Lorentz violating decay rate of muons in flight.   We obtain bounds which are three orders of magnitude stronger than previous ones from other types of experiments.

Another work is aimed at probing the breakdown of time reversal in nature, which, within relativistic quantum field theory, is equivalent to CP violation.   We show how to improve the measurement of the Standard Model CP violating phase and discuss its sensitivity to new physics beyond the Standard Model.

CP violation is a crucial ingredient in another fundamental puzzle, namely that of understanding the apparent matter-antimatter asymmetry in the universe.   A popular mechanism which solves this puzzle is Leptogenesis, where lepton asymmetry is produced in the decay of hypothesized heavy particles, and then induces baryon asymmetry via dynamical effects.   We show that Leptogenesis is often robust in predicting an asymmetry, irrespective of the particular initial state of the plasma just before the decays occur.

Last, we propose a new type of warped extra dimensions models which explains the hierarchy among the fermion masses and flavor parameters, and in the same time features new physics at energies low enough to be probed by the Large Hadron Collider at CERN.