1,147 research outputs found
Phenomenology of Mixed Modulus-Anomaly Mediation in Fluxed String Compactifications and Brane Models
In some string compactifications, for instance the recently proposed KKLT
set-up, light moduli are stabilized by nonperturbative effects at
supersymmetric AdS vacuum which is lifted to a dS vacuum by supersymmetry
breaking uplifting potential. In such models, soft supersymmetry breaking terms
are determined by a specific mixed modulus-anomaly mediation in which the two
mediations typically give comparable contributions to soft parameters. Similar
pattern of soft terms can arise also in brane models to stabilize the radion by
nonperturbative effects. We examine some phenomenological consequences of this
mixed modulus-anomaly mediation, including the pattern of low energy sparticle
spectrum and the possibility of electroweak symmetry breaking. It is noted that
adding the anomaly-mediated contributions at amounts to replacing the
messenger scale of the modulus mediation by a mirage messenger scale
where
for denoting the
modulus-mediated contribution to the gaugino mass at . The minimal
KKLT set-up predicts . As a consequence, for ,
the model can lead to a highly distinctive pattern of sparticle masses at TeV
scale, particularly when .Comment: 20 pages, 15 figures, some notations are changed, typos are corrected
and discussions on the CP phase from and B are adde
Precision SUSY Measurements at LHC
If supersymmetry exists at the electroweak scale, then it should be
discovered at the LHC. Determining masses, of supersymmetric particles however,
is more difficult. In this paper, methods are discussed to determine
combinations of masses and of branching ratios precisely from experimentally
observable distributions. In many cases such measurements alone can greatly
constrain the particular supersymmetric model and determine its parameters with
an accuracy of a few percent. Most of the results shown correspond to one year
of running at LHC at ``low luminosity'.Comment: 52 pages, Latex with 42 postscript figures. Postscript version also
at http://www-physics.lbl.gov/www/theorygroup/papers/39412.p
Scherk-Schwarz Supersymmetry Breaking for Quasi-localized Matter Fields and Supersymmetry Flavor Violation
We examine the soft supersymmetry breaking parameters induced by the
Scherk-Schwarz (SS) boundary condition in 5-dimensional orbifold field theory
in which the quark and lepton zero modes are quasi-localized at the orbifold
fixed points to generate the hierarchical Yukawa couplings. In such theories,
the radion corresponds to a flavon to generate the flavor hierarchy and at the
same time plays the role of the messenger of supersymmetry breaking. As a
consequence, the resulting soft scalar masses and trilinear -parameters of
matter zero modes at the compactification scale are highly flavor-dependent,
thereby can lead to dangerous flavor violations at low energy scales. We
analyze in detail the low energy flavor violations in SS-dominated
supersymmetry breaking scenario under the assumption that the compactification
scale is close to the grand unification scale and the 4-dimensional effective
theory below the compactification scale is given by the minimal supersymmetric
standard model. Our analysis can be applied to any supersymmetry breaking
mechanism giving a sizable -component of the radion superfield, e.g. the
hidden gaugino condensation model.Comment: revtex4, 22 pages, some numerical errors are corrected in
phenomenological analysis, main conclusion does not chang
SUSY Parameter Analysis at TeV and Planck Scales
Coherent analyses at future LHC and LC experiments can be used to explore the
breaking mechanism of supersymmetry and to reconstruct the fundamental theory
at high energies, in particular at the grand unification scale. This will be
exemplified for minimal supergravity.Comment: 7 pages, 3 figures, uses espcrc2.sty (included), Proceedings, Loops
and Legs 2004, Zinnowitz on Usedo
Relaxed fine-tuning in models with non-universal gaugino masses
We study, in a bottom-up approach, the fine-tuning problem between soft SUSY
breaking parameters and the -term for the successful electroweak symmetry
breaking in the minimal supersymmetric standard model. It is shown that certain
nontrivial ratios between gaugino masses, that is non-universal gaugino masses,
are necessary at the GUT scale, in order for the fine-tuning to be reduced
above 10 % order. In addition, when all the gaugino masses should be regarded
as independent ones in their origins, a small gluino mass
GeV and a non-vanishing -term associated to top squarks
are also required at the GUT scale as well as the non-universality. On the
other hand, when we consider some UV theory, which fixes ratios of soft SUSY
breaking parameters as certain values with the overall magnitude, heavier
spectra are allowed. It is favored that the gluino and wino masses are almost
degenerate at the weak scale, while wider region of bino mass is favorable.Comment: 17 pages, 29 figure
Results from the Japan's 2018 Report Card on Physical Activity for Children and Youth
Background/Objective: The momentum to promote physical activity (PA) by various government agencies such as the Japan Sports Agency established in 2015, academic organizations, and companies is increasing towards the Tokyo Olympic and Paralympic Games. The goal of the 2018 Japan Report Card on Physical Activity for Children and Youth is to assess and track levels of health behaviors related to PA in Japanese children and youth, facilitators and barriers for PA, and related health outcomes. Methods: Nationally representative data were used to score the indicators. Results: The 2018 Japan Report Card on Physical Activity for Children and Youth consists of health behaviors and outcomes (7 indicators), and influences on health behaviors (4 indicators). The key four health behaviors and outcomes (Organized Sport Participation: B-; Active Transportation: A-; Physical fitness: A, Weight status: A) were favorable. Sedentary Behavior received C- grade, while 2 indicators (Overall Physical Activity, and Active Play) could not be graded. In the Influences domain, Family Influence and Community were graded as C-, while School (B+), Community and Environment (B-), and Government Strategies and Investments (B) were favorable. Conclusions: The 2018 Japan Report Card on Physical Activity for Children and Youth shows that Japanese children and youth have favorable levels of organized sport participation, active transportation to and from school, and physical fitness and weight status. Future nationally representative surveys on overall PA and active play are needed
Effect of an RRRR dimension 5 operator on the proton decay in the minimal SU(5) SUGRA GUT model
We reanalyze the proton decay in the minimal SU(5) SUGRA GUT model. Unlike
previous analyses, we take into account a Higgsino dressing diagram of
dimension 5 operator with right-handed matter fields ( operator). It is
shown that this diagram gives a dominant contribution for over that from operator, and decay rate of this mode
can be comparable with that of which is dominated by
the contribution. It is found that we cannot reduce both the decay rate
of and that of simultaneously
by adjusting relative phases between Yukawa couplings at colored Higgs
interactions. Constraints on the colored Higgs mass and a typical squark
and slepton mass from Super-Kamiokande limit become
considerably stronger due to the Higgsino dressing diagram of the
operator: M_C > 6.5 \times 10^{16}\gev for m_{\tilde{f}} < 1 \tev, and
m_{\tilde{f}} > 2.5 \tev for M_C < 2.5 \times 10^{16} \gev.Comment: 32 pages, 5 figures, an appendix added, a reference adde
Flavor mixing in the gluino coupling and the nucleon decay
Flavor mixing in the quark-squark-gluino coupling is studied for the minimal
SU(5) SUGRA-GUT model and applied to evaluation of the nucleon lifetime. All
off-diagonal (generation mixing) elements of Yukawa coupling matrices and of
squark/slepton mass matrices are included in solving numerically one-loop
renormalization group equations for MSSM parameters, and the parameter region
consistent with the radiative electroweak symmetry breaking condition is
searched. It is shown that the flavor mixing in the gluino coupling for a large
is of the same order of magnitude as the corresponding
Kobayashi-Maskawa matrix element in both up-type and down-type sector. There
exist parameter regions where the nucleon decay amplitudes for charged lepton
modes are dominated by the gluino dressing process, while for all the examined
regions the neutrino mode amplitudes are dominated by the wino dressing over
the gluino dressing.Comment: 24 pages, LaTeX, figures are available upon request.
ICRR-Report-317-94-1
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