597 research outputs found
Radiative CP Phases in Supergravity Theories
In this letter, we point out that possible sources of CP violation originate
from radiative corrections to soft terms which are ubiquitous in supergravity
theories and also in other high-energy frameworks of supersymmetry breaking.
With these radiative phases of gaugino masses and scalar couplings, a complex
phase of Higgs holomorphic mass parameter is generated via
renormalization-group running down to low energy. It is found that its phase
value is mainly controlled by wino as well as gluino, which generally receive
different radiative corrections to their complex phases, even if the leading
part of mass parameters follow from the universality hypothesis. The
radiatively generated phases are constrained by the existing experimental
bounds on electric dipole moments, and may be detectable in future
measurements. They are also found to be available for the cancellation
mechanism to be worked.Comment: 14 pages, 5 figures, references adde
Higgs mass, muon g-2, and LHC prospects in gauge mediation models with vector-like matters
Recently the ATLAS and CMS collaborations presented preliminary results of
Standard Model Higgs searches and reported excesses of events for a Higgs boson
at 124-126 GeV. Such a Higgs mass can be naturally realized, simultaneously
explaining the muon g-2 anomaly, in gauge-mediated SUSY breaking models with
extra vector-like matters. Upper bounds are obtained on the gluino mass,
m_{\tilde g}\lesssim 1.2 (1.8) TeV, and on the extra vector-like quark mass,
M_{Q'} \lesssim 1.0 (1.8) GeV, in the parameter region where the Higgs boson
mass is 124-126 GeV and the muon g-2 is consistent with the experimental value
at the 1 sigma (2 sigma) level. The LHC prospects are explored in the parameter
region. It is found that some of the regions are already excluded by the LHC,
and most of the parameter space is expected to be covered at \sqrt{s} = 14 TeV.
A study on the extra vector-like quarks, especially current bounds on their
masses and prospects for future searches, is also included.Comment: 28 pages, 10 figure
Probing minimal SUSY scenarios in the light of muon and dark matter
We study supersymmetric (SUSY) models in which the muon discrepancy and
the dark matter relic abundance are simultaneously explained. The muon
discrepancy, or a 3 deviation between the experimental and theoretical
results of the muon anomalous magnetic moment, can be resolved by SUSY models,
which implies at least three SUSY multiplets have masses of
. In particular, models with the
bino, higgsino and slepton having
masses are not only capable to explain the muon discrepancy but naturally
contains the neutralino dark matter with the observed relic abundance. We study
constraints and future prospects of such models; in particular, we find that
the LHC search for events with two hadronic taus and missing transverse
momentum can probe this scenario through chargino/neutralino production. It is
shown that almost all the parameter space of the scenario can be probed at the
high-luminosity LHC, and a large part can also be tested at the XENON1T
experiment as well as at the ILC.Comment: 16 pages, 5 figures; the published versio
Low-scale Gaugino Mass Unification
We study a new class of scenarios with the gaugino mass unification at the
weak scale. The general condition is first derived for the unification to
occur. Among the general cases, a particular attention is drawn to the mirage
gauge mediation where the low-energy mass spectrum is governed by the mirage of
unified gauge coupling which is seen by low-energy observers. The gaugino
masses have natural and stable low-scale unification. The mass parameters of
scalar quarks and leptons are given by gauge couplings but exhibit no large
mass hierarchy. They are non-universal even when mediated at the gauge coupling
unification scale. In addition, the gravitino is rather heavy and not the
lightest superparticle. These facts are in contrast to existing gauge and
mirage mediation models. We also present several explicit models for
dynamically realizing the TeV-scale unification.Comment: 31 pages, 1 figure, references adde
Reconstructing Supersymmetric Contribution to Muon Anomalous Magnetic Dipole Moment at ILC
We study the possibility to determine the supersymmetric (SUSY) contribution
to the muon anomalous magnetic dipole moment by using ILC measurements of the
properties of superparticles. Assuming that the contribution is as large as the
current discrepancy between the result of the Brookhaven E821 experiment and
the standard-model prediction, we discuss how and how accurately the SUSY
contribution can be reconstructed. We will show that, in a sample point, the
reconstruction can be performed with the accuracy of ~ 13 % with the
center-of-mass energy 500 GeV and the integrated luminosity ~ 500-1000 fb-1.Comment: 18 pages, 2 figures, 2 tables; references added, to be published in
Phys.Lett.
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