8,455 research outputs found
Mutual cosideration of and in supersymmetric SO(10) grand unification
We compare the branching ratios for and
in terms of constraining the parameter space in
supersymmetric SO(10) grand unification models where supersymmetry is broken
softly near the Planck scale by generationally symmetric operators. We observe
two general cases. One with small and the other one with large
having third generation Yukawa coupling unification at the GUT
scale. \newline\indent We show that for small the branching ratio
constraints allow only a smaller region of parameter space for compared
to for gluino mass \alt 500 GeV.
With large , we find acceptable regions of parameter space with
\left|\mu \right|\alt 1 TeV only for . The dominant constraint on
large with parameter space is found to be given by the
branching ratio, while for large with it is found to be given by the branching ratio. In
many of these acceptable regions, we find that the
branching ratio is predicted to be within one order of magnitude of its current
experimental bound. We also show that the usually neglected gluino mediated
diagrams in can not be ignored in some regions of
parameter space, especially for large scenarios when the gluino
mass is near its lower experimental bound.Comment: 14 pages (Latex), 4 PS figs (uuencoded, epsf.tex), slight
modification in text, as to appear in Physics Letters
Managing knowledge in organizations : a Nonaka’s SECI model operationalization
Purpose: The SECI model (Nonaka, 1994) is the best-known conceptual framework for understanding knowledge generation processes in organizations. To date, however, empirical support for this framework has been overlooked. The present study aims to provide an evidence-based groundwork for the SECI model by testing a multidimensional questionnaire Knowledge Management SECI Processes Questionnaire (KMSP-Q) designed to capture the knowledge conversion modes theorized by Nonaka.
Methodology: In a twofold study, the SECI model was operationalized via the KMSP-Q. Specifically, Study One tested its eight-dimensional structure through exploratory and confirmatory factorial analyses on 372 employees from different sectors. Study Two examined the construct validity and reliability by replicating the KMSP-Q factor structure in knowledge-intensive contexts (on a sample of 466 health-workers), and by investigating the unique impact of each dimension on some organizational outcomes (i.e., performance, innovativeness, collective efficacy).
Findings: The overall findings highlighted that the KMSP-Q is a psychometrically robust questionnaire in terms of both dimensionality and construct validity, the different knowledge generation dimensions being specifically linked to different organizational outcomes.
Research/Practical Implications: The KMSP-Q actualizes and provides empirical consistency to the theory underlying the SECI model. Moreover, it allows for the monitoring of an organization’s capability to manage new knowledge and detect the strengths/weaknesses of KM-related policies and programs.
Originality/Value: This paper proposes a comprehensive measure of knowledge generation in work contexts, highlighting processes that organizations are likely to promote in order to improve their performance through the management of their knowledge resources
Effects of an intermediate scale in SUSY grand unification
We discuss the production of lepton flavor violation and EDMs and the
viability of the unification hypothesis in SUSY grand unification with
an intermediate gauge symmetry breaking scale.Comment: 3 pages (Latex, esprc2.sty used), talk given at 4th International
Conference on Supersymmetry (SUSY '96, College Park, MD, May 29 - June 1,
1996
The fine-tuning price of the early LHC
LHC already probed and excluded half of the parameter space of the
Constrained Minimal Supersymmetric Standard Model allowed by previous
experiments. Only about 0.3% of the CMSSM parameter space survives. This
fraction rises to about 0.9% if the bound on the Higgs mass can be
circumvented.Comment: 7 pages. v3: updated with new bounds from ATLAS and CMS at 1.1/fb
presented at the EPS-HEP-2011 conferenc
Electric dipole moments and b- unification in the presence of an intermediate scale in SUSY grand unification
We show that an intermediate gauge symmetry breaking scale can be a
significant source of electric dipole moments for the electron and neutron in
supersymmetric grand unified theories. New phases, similar to that of the CKM
matrix, appear which do not arise from the supersymmetry (SUSY) breaking
operators. To illustrate, we choose some grand unified SUSY models having an
intermediate gauge symmetry breaking scale with some attractive features. We
also show how well the unification hypothesis works in this class of
models.Comment: 14 pages(Latex), 2 PS Figures (uuencoded, epsf.tex
QCD Radiative Corrections to the Leptonic Decay Rate of the B_c Meson
The QCD radiative corrections to the leptonic decay rate of the meson
are calculated using the formalism of nonrelativistic QCD (NRQCD) to separate
short-distance and long-distance effects. The decay constant is factored
into a sum of NRQCD matrix elements each multiplied by a short-distance
coefficient. The short-distance coefficient for the leading matrix element is
calculated to order by matching a perturbative calculation in full
QCD with the corresponding perturbative calculation in NRQCD. This
short-distance correction decreases the leptonic decay rate by approximately
.Comment: Changed Eq. 2 to read 1/(8 \pi), put in a missing i M_{B_c} in Eq.
18, and put in a normalisation factor of 2 M_{B_c} in Eq. 19
Squarks Below the Z
We investigate the possibility that the difference between the measurements
of from the hadronic branching ratio of the and the world
average of other measurements is due to the decay of the into quark,
anti-squark, and gluino. Consequences for supersymmetry breaking models are
discussed.Comment: 9 pages, 4 figures not include
Supersymmetry without a light Higgs boson but with a light pseudoscalar
We consider the lambda-SUSY model, a version of the NMSSM with large lambda
H_1 H_2 S coupling, relaxing the approximation of large singlet mass and
negligible mixing of the scalar singlet with the scalar doublets. We show that
there are regions of the parameter space in which the lightest pseudoscalar can
be relatively light, with unusual consequences on the decay pattern of the
CP-even Higgs bosons and thus on the LHC phenomenology.Comment: 11 pages, 3 figures. v3: Conforms to published versio
Grand Unification and the Principle of Minimal Flavor Violation
Minimal Flavor Violation is an attractive approach to suppress unacceptably
large flavor changing neutral currents from beyond the standard model physics
at the TeV scale. It can be used in theories with low energy supersymmetry,
multi Higgs doublet theories and other extensions of the minimal standard
model. We show how minimal flavor violation can be implemented in Grand Unified
theories.Comment: 15 pages, no figure
Systematic Study Of Leptonic Mixing In A Class Of SU_H(2) Models
We perform a systematic analysis of the PMNS matrices which arise when one
assigns the three generations of leptons to the representation of a
horizontal symmetry. This idea has been previously explored by
Kuchimanchi and Mohapatra. However, we assume the neutrino mass matrix
results from leptonic couplings to triplet scalar fields and
hierarchies exist amongst lepton mass matrix elements which result from
couplings to scalar fields with different charges. Of the sixteen
candidate PMNS matrices which result it is found that only one is both
predictive and possesses a leading order structure compatible with experimental
data. The relevant neutrino mass matrix displays the symmetry
to leading order and we explore the perturbations required
to produce a realistic lepton spectrum. The effective mass in neutrinoless
double beta decay is required to lie in the range
, which is just below current
experimental bounds. is non-zero but not uniquely determined.Comment: To appear in Phys. Rev.
- …