2,450 research outputs found
Strong and Electromagnetic Decays of The -wave Heavy Mesons
We calculate the , , , and coupling constants
between the heavy meson doublets and (0^-,1^-)/(0^+,1^+) within the
framework of the light-cone QCD sum rule at the leading order of heavy quark
effective theory. Most of the sum rules are stable with the variations of the
Borel parameter and the continuum threshold. Then we calculate the strong and
electromagnetic decay widths of the D-wave heavy mesons. Their
total widths are around several tens of MeV, which is helpful in the future
experimental search.Comment: 20 pages, 13 figure
Light vector meson and heavy baryon strong interaction
We calculate the coupling constants between the light vector mesons and heavy
baryons within the framework of the light-cone QCD sum rule in the leading
order of heavy quark effective theory. Most resulting sum rules are stable with
the variations of the Borel parameter and the continuum threshold. The
extracted couplings will be useful in the study of the possible heavy baryon
molecular states
Strong decays of and
With the identification of () as the (,
) doublet in the heavy quark effective field theory, we derive the light
cone QCD sum rule for the coupling of eta meson with and
. Through mixing we calculate their pionic
decay widths, which are consistent with the experimental values (or upper
limits). Combining the radiative decay widths derived by Colangelo, Fazio and
Ozpineci in the same framework, we conclude that the decay patterns of
strongly support their interpretation as ordinary mesons.Comment: Comments and suggestions welcome
Fusion rules and shrinking rules of topological orders in five dimensions
As a series of work about 5D (spacetime) topological orders, here we employ
the path-integral formalism of 5D topological quantum field theory (TQFT)
established in Zhang and Ye, JHEP 04 (2022) 138 to explore non-Abelian fusion
rules, hierarchical shrinking rules and quantum dimensions of particle-like,
loop-like and membrane-like topological excitations in 5D topological orders.
To illustrate, we focus on a prototypical example of twisted theories that
comprise the twisted topological terms of the type. First, we classify
topological excitations by establishing equivalence classes among all
gauge-invariant Wilson operators. Then, we compute fusion rules from the
path-integral and find that fusion rules may be of non-Abelian nature, i.e.,
the fusion outcome can be a direct sum of distinct excitations. We further
compute shrinking rules. Especially, we discover exotic hierarchical structures
hidden in shrinking processes of 5D or higher: a membrane is shrunk into
particles and loops, and the loops are subsequently shrunk into a direct sum of
particles. We obtain the algebraic structure of shrinking coefficients and
fusion coefficients. We compute the quantum dimensions of all excitations and
find that sphere-like membranes and torus-like membranes differ not only by
their shapes but also by their quantum dimensions. We further study the
algebraic structure that determines anomaly-free conditions on fusion
coefficients and shrinking coefficients. Besides , we explore general
properties of all twisted terms in D. Together with braiding statistics
reported before, the theoretical progress here paves the way toward
characterizing and classifying topological orders in higher dimensions where
topological excitations consist of both particles and spatially extended
objects
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microRNAs in cardiac regeneration and cardiovascular disease
microRNAs (miRNAs) are a class of small non-coding RNAs, which have been shown important to a wide range of biological process by post-transcriptionally regulating the expression of protein-coding genes. miRNAs have been demonstrated essential to normal cardiac development and function. Recently, numerous studies indicate miRNAs are involved in cardiac regeneration and cardiac disease, including cardiac hypertrophy, myocardial infarction and cardiac arrhythmia. These observations suggest miRNAs play important roles in cardiology. In this review, we summarize the recent progress of studying miRNAs in cardiac regeneration and cardiac disease. We also discuss the diagnostic and therapeutic potential of miRNAs in heart disease
Faithful completion of images of scenic landmarks using internet images
Abstract—Previous works on image completion typically aim to produce visually plausible results rather than factually correct ones. In this paper, we propose an approach to faithfully complete the missing regions of an image. We assume that the input image is taken at a well-known landmark, so similar images taken at the same location can be easily found on the Internet. We first download thousands of images from the Internet using a text label provided by the user. Next, we apply two-step filtering to reduce them to a small set of candidate images for use as source images for completion. For each candidate image, a co-matching algorithm is used to find correspondences of both points and lines between the candidate image and the input image. These are used to find an optimal warp relating the two images. A completion result is obtained by blending the warped candidate image into the missing region of the input image. The completion results are ranked according to combination score, which considers both warping and blending energy, and the highest ranked ones are shown to the user. Experiments and results demonstrate that our method can faithfully complete images
Global analysis of measured and unmeasured hadronic two-body weak decays of antitriplet charmed baryons
A large amount of data on hadronic two body weak decays of anti-triplet
charmed baryons to an octet baryon and an octet or singlet
pseudoscalar meson , , have been measured. The SU(3)
flavor symmetry has been applied to study these decays to obtain insights about
weak interactions for charm physics. However not all such decays needed to
determine the SU(3) irreducible amplitudes have been measured forbidding a
complete global analysis. Previously, it has been shown that data from measured
decays can be used to do a global fit to determine all except one parity
violating and one parity conserving amplitudes of the relevant SU(3)
irreducible amplitudes causing 8 hadronic two body weak decay channels
involving to or transitions undetermined. It is
important to obtain information about these decays in order to guide
experimental searches. In this work using newly measured decay modes by BESIII
and Belle in 2022, we carry out a global analysis and parameterize the unknown
amplitudes to provide the ranges for the branching ratios of the 8 undetermined
decays. Our results indicate that the SU(3) flavor symmetry can explain the
measured data exceptionally well, with a remarkable minimal of
1.21 and predict 80 observables in 45 decays for future experimental data to
test. We then vary the unknown SU(3) amplitudes to obtain the allowed range of
branching ratios for the 8 undetermined decays. We find that some of them are
within reach of near future experimental capabilities. We urge our experimental
colleagues to carry out related searches.Comment: 9pages, 2 figures, 3 table
The Strong Decay Patterns of the Exotic Hybrid Mesons
We calculate the coupling constants of the decay modes
within the framework of the light-cone QCD sum rule. Then we calculate the
partial width of these decay channels, which differ greatly from the existing
calculations using phenomenological models. For the isovector state,
the dominant decay modes are . For its isoscalar partner, its
dominant decay mode is . We also discuss the possible search of the
state at BESIII, for example through the decay chains or where can
be reconstructed through the decay modes
or . Hopefully the present work will be helpful to the
experimental establishment of the hybrid meson.Comment: 14 pages, 10 figure
Refined mapping of loss of heterozygosity in Chinese sporadic gastric carcinoma
The aim of this study is to explore precise deleted regions where the candidate tumor suppressor genes might be located in Chinese sporadic gastric carcinoma. By searching in Genothon, NCBI and GDB databases, 145 polymorphic microsatellite markers were chosen, at a mean density of approximately one marker every 2 - 4 cM, covering 15 chromosomes. These polymorphic microsatellite markers in gastric carcinoma and adjacent tissue were analyzed via PCR. PCR products were submitted to electrophoresis on an ABI 3730 DNA sequencer. Genemapper3.2 software was used for LOH (Loss of Heterozygosity) scanning and analysis. Comparison between LOH frequency and clinicopathological factors was performed by Fisher’s exact test. 26 refined regions were mapped as candidate regions for TSGs (Tumor suppression genes) in Chinese sporadic gastric cancer. Associations between LOH and clinical information indicated that 6 loci was associated with pTNM stage, 5 with Lauren's type, 4 with lymph nodes metastasis and another 2 with distant metastasis. Through refined deletion mapping, 26 candidate regions, where TSGs may be located, were found and 17 loci were proposed to be used as clinical markers in Chinese sporadic gastric cancer.Keywords: Gastric carcinoma, refined mapping, loss of heterozygosity (LOH), tumor suppressor genes (TSGs), tumor markersAfrican Journal of Biotechnology Vol. 9(35), pp. 5754-5761, 30 August, 201
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