2,080 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
Forecasting of global horizontal irradiance by exponential smoothing, using decompositions
Time series methods are frequently used in solar irradiance forecasting when two dimensional cloud information provided by satellite or sky camera is unavailable. ETS (exponential smoothing) has received extensive attention in the recent years since the invention of its state space formulation. In this work, we combine these models with knowledge based heuristic time series decomposition methods to improve the forecasting accuracy and computational efficiency.<p></p>
In particular, three decomposition methods are proposed. The first method implements an additive seasonal-trend decomposition as a preprocessing technique prior to ETS. This can reduce the state space thus improve the computational efficiency. The second method decomposes the GHI (global horizontal irradiance) time series into a direct component and a diffuse component. These two components are used as forecasting model inputs separately; and their corresponding results are recombined via the closure equation to obtain the GHI forecasts. In the third method, the time series of the cloud cover index is considered. ETS is applied to the cloud cover time series to obtain the cloud cover forecast thus the forecast GHI through polynomial regressions. The results show that the third method performs the best among three methods and all proposed methods outperform the persistence models.<p></p>
4-Fluoroanilinium tetrachloridoferrate(III) 18-crown-6 clathrate
The reaction of 4-fluoroaniline hydrochloride, 18-crown-6 and ferric chloride in methanolic solution yields the title compound, (C6H7FN)[FeCl4]·C12H24O6, which has an unusual supramolecular structure. N—H⋯O hydrogen-bonding interactions between the NH3
+ substituents of the 4-fluoroanilinium cations and the O atoms of the crown ether molecules result in a rotator–stator-like structure
4-Methylanilinium tetrafluoroborate 18-crown-6 clathrate
In the title compound, C7H10N+·BF4
−·C12H24O6, the protonated 4-methylanilinium cation interacts with 18-crown-6 forming a rotator–stator structure, (C6H4CH3NH3
+)(18-crown-6), through three bifurcated N—H⋯(O,O) hydrogen bonds between the ammonium groups of the cations (–NH3) and the O atoms of the crown ether molecule. The BF4
− anions, the methyl group and the protonated –NH3 groups of the 4-methylanilinium lie on a dual axis of rotation. The 18-crown-6 unit is perpendicular to the dual axis of rotation and the mirror plane which contains the dual axis of rotation. The benzene ring of 4-methylanilinium is perpendicular to the mirror plane and parallel to the dual axis
Age-related BMAL1 change affects mouse bone marrow stromal cell proliferation and osteo-differentiation potential
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