57 research outputs found
Majorana CP Violation in Approximately \mu-\tau Symmetric Models with det(M_\nu)=0
We discuss effects of Majorana CP violation in a model-independent way for a
given phase structure of flavor neutrino masses. To be more predictive, we
confine ourselves to models with , where is a flavor
neutrino mass matrix, and to be consistent with observed results of the
neutrino oscillation, the models are subject to an approximate -
symmetry. There are two categories of approximately - symmetric
models classified as (C1) yielding and
and (C2) yielding and
, where stands for
the mixing of massive neutrinos and ( and ) and
() stands for the mass squared
difference for atmospheric (solar) neutrinos. The Majorana phase can be large
for the normal mass hierarchy and for the inverted mass hierarchy with
only realized in (C1) while they are generically small for
the inverted mass hierarchy with in both (C1) and (C2). These
results do not depend on a specific choice of phases in but hold true
in any models with because of the rephasing invariance.Comment: 28 pages, 7 Figures, typos in equations and references corrected,
version to appear in Prog. Theor. Phys. 123, No. 4 (2010, April
Dynamically Favored Chiral Symmetry Breakings in Supersymmetric Quantum Chromodynamics
By the use of an effective superpotential in supersymmetric quantum
chromodynamics (SQCD) with N_f flavors and N_c colors of quarks for N_f>=N_c+2,
the influence of soft supersymmetry (SUSY) breakings is examined to clarify
dynamics of chiral symmetry breakings near the SUSY limit. In case that SQCD
triggers spontaneous chiral symmetry breakings, it is possible to show that our
superpotential dynamically favors the successive formation of condensates,
leaving either SU(N_f-N_c) or SU(N_f-N_c+1) unbroken as a chiral nonabelian
symmetry.Comment: 7 pages by RevTeX (with a note added
- …