Majorana Fermions and CP Violation from 5-dimensional Theories; a Systematic Approach

Details Majorana Fermions and CP Violation from 5-dimensional Theories; a Systematic Approach Majorana Fermions and CP Violation from 5-dimensional Theories; a Systematic Approach

2005-01-26

arxiv.org/abs/hep-ph/0501238v1

Phys.Rev. D72 (2005) 125012

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1103/PhysRevD.72.125012

Within five-dimensional compactified theories we discuss generalized periodicity and orbifold boundary conditions that allow for mixing between particles and anti-particles after a shift by the size of extra dimensions or after the orbifold reflection. A systematic strategy for constructing 4-dimensional models is presented, in particular we find a general form of the periodicity and orbifold conditions that are allowed by consistency requirements. We formulate general conditions for a presence of massless Kaluza-Klein modes and discuss remaining gauge symmetry of the zero-mode sector. It is shown that if the orbifold twist operation transforms particles into anti-particles then the zero-mode fermions are 4-dimensional Majorana fermions. The possibility of explicit and spontaneous CP violation is discussed. General considerations are illustrated by many Abelian and non-Abelian examples.

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