2,750 research outputs found
How to interpret a discovery or null result of the decay
The Majorana nature of massive neutrinos will be crucially probed in the
next-generation experiments of the neutrinoless double-beta ()
decay. The effective mass term of this process, , may
be contaminated by new physics. So how to interpret a discovery or null result
of the decay in the foreseeable future is highly nontrivial. In
this paper we introduce a novel three-dimensional description of , which allows us to see its sensitivity to the lightest
neutrino mass and two Majorana phases in a transparent way. We take a look at
to what extent the free parameters of can be well
constrained provided a signal of the decay is observed someday.
To fully explore lepton number violation, all the six effective Majorana mass
terms (for )
are calculated and their lower bounds are illustrated with the two-dimensional
contour figures. The effect of possible new physics on the decay
is also discussed in a model-independent way. We find that the result of
in the normal (or inverted) neutrino mass ordering
case modified by the new physics effect may somewhat mimic that in the inverted
(or normal) mass ordering case in the standard three-flavor scheme. Hence a
proper interpretation of a discovery or null result of the decay
may demand extra information from some other measurements.Comment: 13 pages, 6 figures, Figures and references update
Light-Cone Sum Rules Analysis of Weak Decays
We analyze the weak decay of doubly-heavy baryon decays into anti-triplets
with light-cone sum rules. To calculate the decay form factors,
both bottom and charmed anti-triplets and are described
by the same set of leading twist light-cone distribution functions. With the
obtained form factors, we perform a phenomenology study on the corresponding
semi-leptonic decays. The decay widths are calculated and the branching ratios
given in this work are expected to be tested by future experimental data, which
will help us to understand the underlying dynamics in doubly-heavy baryon
decays.Comment: 19 pages, 3 figures, 7 table
SU(3) analysis of fully-light tetraquarks in heavy meson weak decays
We perform a SU(3) analysis for both semi-leptonic and non-leptonic heavy
meson weak decays into a pseudoscalar meson and a fully-light tetraquark in 10
or 27 representation. A reduction of the SU(3) representation tensor for the
fully-light tetraquarks is produced and all the flavor components for each
representation tensor are listed. The decay channels we analysis include , and , with represents
a fully-light tetraquark in 10 or 27 representation and is a pseudoscalar
meson. Finally, among these results we list all the golden decay channels which
are expected to have more possibilities to be observed in experiments.Comment: 32 pages, 5 figure
Orbital stability of periodic traveling waves to some coupled BBM equations
In this work, we show some results concerning the orbital stability of dnoidal wave solutions to some Benjamin-Bona-Mahony equations (BBM equations henceforth). First, by the standard argument, we prove the existence of a smooth curve of positive traveling wave solutions of dnoidal type. Then, we show that this type of solutions are orbitally stable by perturbations with the same period L. The major tools to obtain these results are the Grillaks, Shatah and Strauss' general theory in the periodic case. The results in the present paper extend some previous stability results for the BBM equations
Towards Benchmarking GUI Compatibility Testing on Mobile Applications
GUI is a bridge connecting user and application. Existing GUI testing tasks
can be categorized into two groups: functionality testing and compatibility
testing. While the functionality testing focuses on detecting application
runtime bugs, the compatibility testing aims at detecting bugs resulting from
device or platform difference. To automate testing procedures and improve
testing efficiency, previous works have proposed dozens of tools. To evaluate
these tools, in functionality testing, researchers have published testing
benchmarks. Comparatively, in compatibility testing, the question of ``Do
existing methods indeed effectively assist test cases replay?'' is not well
answered. To answer this question and advance the related research in GUI
compatibility testing, we propose a benchmark of GUI compatibility testing. In
our experiments, we compare the replay success rate of existing tools. Based on
the experimental results, we summarize causes which may lead to ineffectiveness
in test case replay and propose opportunities for improving the
state-of-the-art
Gap Anisotropy in Iron-Based Superconductors: A Point-Contact Andreev Reflection Study of BaFeNiAs Single Crystals
We report a systematic investigation on c-axis point-contact Andreev
reflection (PCAR) in BaFeNiAs superconducting single crystals
from underdoped to overdoped regions (0.075 ). At optimal
doping () the PCAR spectrum feature the structures of two
superconducting gap and electron-boson coupling mode. In the scenario,
quantitative analysis using a generalized Blonder-Tinkham-Klapwijk (BTK)
formalism with two gaps: one isotropic and another angle dependent, suggest a
nodeless state in strong-coupling limit with gap minima on the Fermi surfaces.
Upon crossing above the optimal doping (), the PCAR spectrum show an
in-gap sharp narrow peak at low bias, in contrast to the case of underdoped
samples (), signaling the onset of deepened gap minima or nodes in the
superconducting gap. This result provides evidence of the modulation of the gap
amplitude with doping concentration, consistent with the calculations for the
orbital dependent pair interaction mediated by the antiferromagnetic spin
fluctuations.Comment: 5 pages, 4 figure
Numerical study on landslide dynamic process and its impact damage prediction to brick-concrete buildings, a case from Fenghuang street landslide in Shaanxi, China
The study of landslide dynamic process and impact damage has important theoretical and practical significance for landslide risk quantitative assessment. Taking Fenghuang Street landslide in Ningqiang County, Shaanxi Province, China as an example, the dynamic process of landslide and its damage to brick-concrete structure buildings are predicted by using discrete element method. Firstly, a three-dimensional numerical landslide model is established by means of the particle flow code system (PFC3D), which is based on landslide investigation, surveying, engineering exploration and geotechnical testing. Secondly, the whole process of landslide deformation, failure, movement and impact damage was simulated, and the velocity, displacement and impact force of the landslide in the motion process were quantitatively studied. Thirdly, the building model (brick-concrete structure) located at the foot of the landslide was constructed by PFC3D and finite element software (Midas/gen), respectively. The characteristics of deformation and displacement of the buildings after the landslide impact are analyzed, and the impact damage of the landslide is predicted. The results show that the rear edge of Fenghuang Street landslide first deforms and fails, and the leading edge is gradually pushed out. After the locking section of the front edge is broken, the landslide begins to slide as a whole, which is a typical push landslide. The main sliding time of the landslide is about 30Â s, the maximum average velocity is 3.2Â m/s, and the maximum displacement is about 40Â m. After the landslide hits the building, the building is displaced in the moving direction of the landslide, and the wall of the building impacted by the landslide is destroyed, resulting in an collapse evident. The relevant research methodologies and findings in this paper can provide a reference for the risk assessment of the same type of landslides, especially the quantitative assessment of the vulnerability for the brick-concrete buildings at risk
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