5 research outputs found
Neutrino Oscillations and Collider Test of the R-parity Violating Minimal Supergravity Model
We study the R-parity violating minimal supergravity models accounting for
the observed neutrino masses and mixing, which can be tested in future collider
experiments. The bi-large mixing can be explained by allowing five dominant
tri-linear couplings and . The desired ratio
of the atmospheric and solar neutrino mass-squared differences can be obtained
in a very limited parameter space where the tree-level contribution is tuned to
be suppressed. In this allowed region, we quantify the correlation between the
three neutrino mixing angles and the tri-linear R-parity violating couplings.
Qualitatively, the relations , and are required by the large
atmospheric neutrino mixing angle and the small angle
, and the large solar neutrino mixing angle ,
respectively. Such a prediction on the couplings can be tested in the next
linear colliders by observing the branching ratios of the lightest
supersymmetric particle (LSP). For the stau or the neutralino LSP, the ratio
can be measured
by establishing or , respectively. The
information on the couplings can be drawn by measuring if the neutralino LSP is heavier than the top
quark.Comment: RevTex, 25 pages, 8 eps figure
Electron Electric Dipole Moment from Lepton Flavor Violation
The general Minimal Supersymmetric Standard Model introduces new sources for
Lepton Flavor Violation (LFV) as well as CP-violation. In this paper, we show
that when both sources are present, the electric dipole moment of the electron,
, receives a contribution from the phase of the trilinear -term of
staus, . For , the value of ,
depending on the ratios of the LFV mass elements, can range between zero and
three orders of magnitude above the present bound. We show that the present
bound on rules out a large portion of the CP-violating and the LFV
parameter space which is consistent with the bounds on the LFV rare decays.
We show that studying the correlation between and the P-odd asymmetry
in helps us to derive a more conclusive bound on
We also discuss the possibility of cancelation among the contributions of
different CP-violating phases to .Comment: 35 pages, 9 figure