4,025 research outputs found
Third generation sfermions decays into Z and W gauge bosons: full one-loop analysis
The complete one-loop radiative corrections to third generation scalar
fermions into gauge bosons Z and W^\pm is considered. We focus on \wt{f}_2 \to
Z \wt{f}_1 and \wt{f}_i \to W^\pm \wt{f'}_j (f,f'=t,b). We include both
SUSY-QCD, QED and full electroweak corrections. It is found that the
electroweak corrections can be of the same order as the SUSY-QCD corrections.
The two sets of corrections interfere destructively in some region of parameter
space. The full one loop correction can reach 10% in some SUGRA scenario, while
in model independent analysis like general MSSM, the one loop correction can
reach 20% for large \tan\beta and large trilinear soft breaking terms A_b.Comment: Latex file, 18 pages, 8 figures, version to appear in PR
Three-dimensional Roton-Excitations and Supersolid formation in Rydberg-excited Bose-Einstein Condensates
We study the behavior of a Bose-Einstein condensate in which atoms are weakly
coupled to a highly excited Rydberg state. Since the latter have very strong
van der Waals interactions, this coupling induces effective, nonlocal
interactions between the dressed ground state atoms, which, opposed to dipolar
interactions, are isotropically repulsive. Yet, one finds partial attraction in
momentum space, giving rise to a roton-maxon excitation spectrum and a
transition to a supersolid state in three-dimensional condensates. A detailed
analysis of decoherence and loss mechanisms suggests that these phenomena are
observable with current experimental capabilities.Comment: 4 pages, 5 figure
Size-dependent electronic-transport mechanism and sign reversal of magnetoresistance in Nd0.5Sr0.5CoO3
A detailed investigation of electronic-transport properties of Nd0.5Sr0.5CoO3
has been carried out as a function of grain size ranging from micrometer order
down to an average size of 28 nm. Interestingly, we observe a size induced
metal-insulator transition in the lowest grain size sample while the bulk-like
sample is metallic in the whole measured temperature regime. An analysis of the
temperature dependent resistivity in the metallic regime reveals that the
electron-electron interaction is the dominating mechanism while other processes
like electron-magnon and electron-phonon scatterings are also likely to be
present. The fascinating observation of enhanced low temperature upturn and
minimum in resistivity on reduction of grain size is found due to
electron-electron interaction (quantum interference effect). This effect is
attributed to enhanced disorder on reduction of grain size. Interestingly, we
observed a cross over from positive to negative magnetoresistance in the low
temperature regime as the grain size is reduced. This observed sign reversal is
attributed to enhanced phase separation on decreasing the grain size of the
cobaltite
Tool Wear and its Effect on Residual Tensile Strength in Drilling of Quartz Cyanate Ester Polymeric Composite
Quartz-Fibre-Reinforced cyanate ester Plastics (QFRP) has superior performance in terms of mechanical, electromagnetic properties and are being widely used in military applications. Drilling is the general machining process for making hole to join the composite part to another sub-assembly. This study presents an influence of optimized drilling parameters on carbide tool wear and its impact on hole characteristics in QFRP composite. The aim is to achieve the optimum use of drill during the drilling process from application perspective without compromising the quality. In addition, the effect of tool wear and its impact on residual tensile strength of quartz composite are studied. The dominant wear mechanism observed is flank wear caused by the abrasive nature of the quartz fibre. The tool wear and delamination factor after drilling 200 holes are 186 µm and 1.40 respectively. The residual strength is affected by the tool wear due to relatively poor interlaminar property between fiber and resin in this quartz composite. The residual strength of quartz specimen drilled with the tool after drilling 200 holes is 14 % lower than the property of specimen drilled with fresh drill. The highlight of the present work is a combined analysis of wear in the tool, delamination induced and residual strength of quartz specimen. The results of this study strengthen the understanding of the drilling process of quartz polymeric composite material in aerospace applications
Effects of CP Violation on Event Rates in the Direct Detection of Dark Matter
A full analytic analysis of the effects of CP violating phases on the event
rates in the direct detection of dark matter in the scattering of neutralinos
from nuclear targets is given. The analysis includes CP violating phases in
softly broken supersymmetry in the framework of the minimal supersymmetric
standard model (MSSM) when generational mixings are ignored. A numerical
analysis shows that large CP violating phases including the constraints from
the experimental limits on the neutron and the electron electric dipole moment
(EDM) can produce substantial effects on the event rates in dark matter
detectors.Comment: 17 pages, LaTex, including 2 figures; revised version to appear in
the Physical Review
Large evolution of the bilinear Higgs coupling parameter in SUSY models and reduction of phase sensitivity
The phases in a generic low-energy supersymmetric model are severely
constrained by the experimental upper bounds on the electric dipole moments of
the electron and the neutron. Coupled with the requirement of radiative
electroweak symmetry breaking, this results in a large degree of fine tuning of
the phase parameters at the unification scale. In supergravity type models,
this corresponds to very highly tuned values for the phases of the bilinear
Higgs coupling parameter and the universal trilinear coupling . We
identify a cancellation/enhancement mechanism associated with the
renormalization group evolution of , which, in turn, reduces such
fine-tuning quite appreciably without taking recourse to very large masses for
the supersymmetric partners. We find a significant amount of reduction of this
fine-tuning in nonuniversal gaugino mass models that do not introduce any new
phases.Comment: Version to appear in Phys.Rev.D. Insignificant changes like a few
typos corrected. 26 pages, 7 figures, LaTe
Detecting Physics At The Post-GUT And String Scales By Linear Colliders
The ability of linear colliders to test physics at the post-GUT scale is
investigated. Using current estimates of measurements available at such
accelerators, it is seen that soft breaking masses can be measured with errors
of about (1-20)%. Three classes of models in the post-GUT region are examined:
models with universal soft breaking masses at the string scale, models with
horizontal symmetry, and string models with Calabi-Yau compactifications. In
each case, linear colliders would be able to test directly theoretical
assumptions made at energies beyond the GUT scale to a good accuracy,
distinguish between different models, and measure parameters that are expected
to be predictions of string models.Comment: Latex, 21 pages, no figure
Thermodynamic Geometric Stability of Quarkonia states
We compute exact thermodynamic geometric properties of the non-abelian
quarkonium bound states from the consideration of one-loop strong coupling.
From the general statistical principle, the intrinsic geometric nature of
strongly coupled QCD is analyzed for the Columbic, rising and Regge rotating
regimes. Without any approximation, we have obtained the non-linear mass effect
for the Bloch-Nordsieck rotating strongly coupled quarkonia. For a range of
physical parameters, we show in each cases that there exists a well-defined,
non-degenerate, curved, intrinsic Riemannian manifold. As the gluons become
softer and softer, we find in the limit of the Bloch-Nordsieck resummation that
the strong coupling obtained from the Sudhakov form factor possesses exact
local and global thermodynamic properties of the underlying mesons, kaons and
particles.Comment: 45 pages, 17 figures, Keywords: Thermodynamic Geometry, Quarkonia,
Massive Quarks, QCD Form Factor. PACS: 02.40.-k; 14.40.Pq; 12.40.Nn; 14.70.D
WMAP Data and Recent Developments in Supersymmetric Dark Matter
A brief review is given of the recent developments in the analyses of
supersymmetric dark matter. Chief among these is the very accurate
determination of the amount of cold dark matter in the universe from analyses
using WMAP data. The implications of this data for the mSUGRA parameter space
are analyzed. It is shown that the data admits solutions on the hyperbolic
branch (HB) of the radiative breaking of the electroweak symmetry. A part of
the hyperbolic branch lies in the so called inversion region where the LSP
neutralino becomes essentially a pure Higgsino and degenerate with
the next to the lightest neutralino and the light chargino
. Thus some of the conventional signals for the observation of
supersymmetry at colliders (e.g., the missing energy signals) do not operate in
this region. On the other hand the inversion region contains a high degree of
degeneracy of , , leading to coannihilations
which allow for the satisfaction of the WMAP relic density constraints deep on
the hyperbolic branch. Further, an analysis of the neutralino-proton cross
sections in this region reveals that this region can still be accessible to
dark matter experiments in the future. Constraints from and from
are discussed. Future prospects are also discussed.Comment: 15 pages Latex. Invited talk at the IV International Conference on
Non-accelerator New Physics (NANP'03), Dubna, Russia, June 23-28, 200
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