18,477 research outputs found
Geometrical interpretation and graphical solution to minimum energy discrete-data control Scientific report no. 9
Linear PAM regulator minimum energy design by geometric interpretation and graphical solutio
On 1-loop diagrams in AdS space and the random disorder problem
We study the complex scalar loop corrections to the boundary-boundary gauge
two point function in pure AdS space in Poincare coordinates, in the presence
of a boundary quadratic perturbation to the scalar. These perturbations
correspond to double trace perturbations in the dual CFT and modify the
boundary conditions of the bulk scalars in AdS. We find that, in addition to
the usual UV divergences, the 1-loop calculation suffers from a divergence
originating in the limit as the loop vertices approach the AdS horizon. We show
that this type of divergence is independent of the boundary coupling, and
making use of which we extract the finite relative variation of the imaginary
part of the loop via Cutkosky rules as the boundary perturbation varies.
Applying our methods to compute the effects of a time-dependent impurity to the
conductivities using the replica trick in AdS/CFT, we find that generally an
IR-relevant disorder reduces the conductivity and that in the extreme low
frequency limit the correction due to the impurities overwhelms the planar CFT
result even though it is supposedly suppressed. Comments on the effect
of time-independent impurity in such a system are presented.Comment: 22 pages, 3 figures, Boundary conditions clarified, some typos fixed,
presentations improved and references adde
Two-Higgs-Doublet type-II and -III models and at the LHC
We study the constraints of the generic two-Higgs-doublet model (2HDM)
type-III and the impacts of the new Yukawa couplings. For comparisons, we
revisit the analysis in the 2HDM type-II. To understand the influence of all
involving free parameters and to realize their correlations, we employ
-square fitting approach by including theoretical and experimental
constraints, such as S, T, and U oblique parameters, the production of standard
model Higgs and its decay to , , , etc.
The errors of analysis are taken at , , and confidence
levels. Due to the new Yukawa couplings being associated with
and , we find that the allowed
regions for and in the type-III model can be broader
when the dictated parameter is positive; however, for negative
, the limits are stricter than those in the type-II model. By using the
constrained parameters, we find that the deviation from the SM in the can be of . Additionally, we also study the top-quark
flavor-changing processes induced at the tree level in the type-III model and
find that when all current experimental data are considered, we get for and GeV and
slightly exceeds for GeV.Comment: 22 pages, 11 figures. v3: Slight change in the abstract, Figure.1
added and commented, the conclusion remains unchange
Radiative and flavor-violating transitions of leptons from interactions with color-octet particles
It has been recently proposed that neutrino mass could originate from Yukawa
interactions of leptons with new colored particles. This raises the interesting
possibility of testing mass generation through copious production of those
particles at hadron colliders. A realistic assessment of it however should take
into account how large those interactions could be from available precision
results. In this work we make a systematic analysis to the flavor structure in
Yukawa couplings, provide a convenient parametrization to it, and investigate
the rare radiative and pure leptonic decays of the muon and tau leptons. For
general values of parameters the muon decays set stringent constraints on the
couplings, and all rare tau decays are far below the current experimental
sensitivity. However, there is room in parameter space in which the muon decays
could be significantly suppressed by destructive interference between colored
particles without generically reducing the couplings themselves. This is also
the region of parameters that is relevant to collider physics. We show that for
this part of parameter space some tau decays can reach or are close to the
current level of precision.Comment: 20 pages, 7 figure
Rank 3 permutation characters and maximal subgroups
In this paper we classify all maximal subgroups M of a nearly simple
primitive rank 3 group G of type L=Omega_{2m+1}(3), m > 3; acting on an L-orbit
E of non-singular points of the natural module for L such that 1_P^G <=1_M^G
where P is a stabilizer of a point in E. This result has an application to the
study of minimal genera of algebraic curves which admit group actions.Comment: 41 pages, to appear in Forum Mathematicu
Rare kaon decays in SUSY with non-universal A terms
We study the rare kaon decays in the framework of general SUSY models. Unlike
the results in the literature, we find the contributions from the gluino
exchange to the branching ratio of can reach the
central value () of the new E787 data while the
predicted value of standard model is less than . We also find that
the same effects also enhance the decays of ,
and .Comment: 9 pages, references added, revised version to appear in J. Phys.
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