730 research outputs found
Higgs Mass and Muon Anomalous Magnetic Moment in Supersymmetric Models with Vector-Like Matters
We study the muon anomalous magnetic moment (muon g-2) and the Higgs boson
mass in a simple extension of the minimal supersymmetric (SUSY) Standard Model
with extra vector-like matters, in the frameworks of gauge mediated SUSY
breaking (GMSB) models and gravity mediation (mSUGRA) models. It is shown that
the deviation of the muon g-2 and a relatively heavy Higgs boson can be
simultaneously explained in large tan-beta region. (i) In GMSB models, the
Higgs mass can be more than 135 GeV (130 GeV) in the region where muon g-2 is
consistent with the experimental value at the 2 sigma (1 sigma) level, while
maintaining the perturbative coupling unification. (ii) In the case of mSUGRA
models with universal soft masses, the Higgs mass can be as large as about 130
GeV when muon g-2 is consistent with the experimental value at the 2 sigma
level. In both cases, the Higgs mass can be above 140 GeV if the g-2 constraint
is not imposed.Comment: 26 pages; 7 figures; corrected typos; minor change
Anomalous Hall voltage rectification and quantized spin-wave excitation induced by the simultaneous dc- and rf-current application in Ni81Fe19 wire
An anomalous Hall effect and rectification of a Hall voltage are observed by
applying a radio-frequency (rf) current through a single-layered ferromagnetic
wire located on a coplanar waveguide. The components of the magnetization
precession, both in and perpendicular to the plane, can be detected via the
Hall voltage rectification of the rf current by incorporating an additional
direct (dc) current. In this paper, we propose a phenomenological model, which
describes the time-dependent anisotropic magnetoresistance and time-dependent
planer Hall effect. The nonlinearity of the spin dynamics accompanied by
spin-waves as functions of rf and dc currents is also studied, as well as those
of the magnitude and orientation of the external magnetic field.Comment: 42 pages, 5 figures, submitte
Color Superconductivity from Supersymmetry
A supersymmetric composite model of color superconductivity is proposed.
Quarks and diquarks are dynamically generated as composite fields by a newly
introduced strong gauge dynamics. It is shown that the condensation of the
scalar component of the diquark supermultiplet occurs when the chemical
potential becomes larger than some critical value. We believe that the model
well captures aspects of the diquark condensate behavior and helps our
understanding of the diquark dynamics in real QCD. The results obtained here
might be useful when we consider a theory composed of quarks and diquarks.Comment: 4 pages, 2 figures, An error in Eq.(10) correcte
AgriSORT: A Simple Online Real-time Tracking-by-Detection framework for robotics in precision agriculture
The problem of multi-object tracking (MOT) consists in detecting and tracking
all the objects in a video sequence while keeping a unique identifier for each
object. It is a challenging and fundamental problem for robotics. In precision
agriculture the challenge of achieving a satisfactory solution is amplified by
extreme camera motion, sudden illumination changes, and strong occlusions. Most
modern trackers rely on the appearance of objects rather than motion for
association, which can be ineffective when most targets are static objects with
the same appearance, as in the agricultural case. To this end, on the trail of
SORT [5], we propose AgriSORT, a simple, online, real-time
tracking-by-detection pipeline for precision agriculture based only on motion
information that allows for accurate and fast propagation of tracks between
frames. The main focuses of AgriSORT are efficiency, flexibility, minimal
dependencies, and ease of deployment on robotic platforms. We test the proposed
pipeline on a novel MOT benchmark specifically tailored for the agricultural
context, based on video sequences taken in a table grape vineyard, particularly
challenging due to strong self-similarity and density of the instances. Both
the code and the dataset are available for future comparisons.Comment: 8 pages, 5 figures, submitted to International Conference on Robotics
and Automation (ICRA) 2024. Code and dataset will be soon available on my
github. This work has been submitted to the IEEE for possible publication.
Copyright may be transferred without notice, after which this version may no
longer be accessibl
The Decay of the Inflaton in No-scale Supergravity
We study the decay of the inflaton in no-scale supergravity and show that
decay due to the gravitational interactions through supergravity effects is
highly suppressed relative to the case in minimal supergravity or models with a
generic Kahler potential. We also show that decay to gravitinos is suppressed.
We demonstrate that decay and sufficient reheating are possible with the
introduction of a non-trivial gauge kinetic term. This channel may be dominant
in no-scale supergravity, yet yields a re-heating temperature which is low
enough to avoid the gravitino problem while high enough for Big Bang
Nucleosynthesis and baryogenesis.Comment: Added the footnote in the conclusion section which discusses the
constrains on the explicit inflaton couplings to the matter fields via
non-renormalizable operators. To appear in JCA
Broadband ferromagnetic resonance of Ni81Fe19 wires using a rectifying effect
The broadband ferromagnetic resonance measurement using the rectifying effect
of Ni81Fe19 wire has been investigated. One wire is deposited on the center
strip line of the coplanar waveguide (CPW) and the other one deposited between
two strip lines of CPW. The method is based on the detection of the
magnetoresistance oscillation due to the magnetization dynamics induced by the
radio frequency field. The magnetic field dependences of the resonance
frequency and the rectification spectrum are presented and analytically
interpreted on the standpoint of a uniform magnetization precession model.Comment: 33pages, 8 figures. submitte
Phase Diagram of Pressure-Induced Superconductivity in EuFe2As2 Probed by High-Pressure Resistivity up to 3.2 GPa
We have constructed a pressuretemperature () phase diagram of
-induced superconductivity in EuFeAs single crystals, via
resistivity () measurements up to 3.2 GPa. As hydrostatic pressure is
applied, an antiferromagnetic (AF) transition attributed to the FeAs layers at
shifts to lower temperatures, and the corresponding resistive
anomaly becomes undetectable for 2.5 GPa. This suggests that the
critical pressure where becomes zero is about 2.5
GPa. We have found that the AF order of the Eu moments survives up to
3.2 GPa without significant changes in the AF ordering temperature
. The superconducting (SC) ground state with a sharp transition
to zero resistivity at 30 K, indicative of bulk
superconductivity, emerges in a pressure range from 2.5
GPa to 3.0 GPa. At pressures close to but outside the SC phase, the
curve shows a partial SC transition (i.e., zero resistivity is not
attained) followed by a reentrant-like hump at approximately
with decreasing temperature. When nonhydrostatic pressure with a uniaxial-like
strain component is applied using a solid pressure medium, the partial
superconductivity is continuously observed in a wide pressure range from 1.1
GPa to 3.2 GPa.Comment: 7 pages, 6 figures, accepted for publication in Physical Review B,
selected as "Editors' Suggestion
R-parity Violating Right-Handed Neutrino in Gravitino Dark Matter Scenario
A decay of the gravitino dark matter is an attractive candidate to explain
the current excesses of the PAMELA/ATIC cosmic-ray data. However, R-parity
violations are required to be very tiny in low-energy scale. We suggest a
R-parity violation in the right-handed neutrino sector. The violation is
suppressed by a see-saw mechanism. Although a reheating temperature is
constrained from above, the thermal leptogenesis is found to work successfully
with a help of the R-parity violating right-handed neutrino.Comment: 13 pages, 1 figur
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