2,329 research outputs found
Isospin and a possible interpretation of the newly observed X(1576)
Recently, the BES collaboration observed a broad resonant structure X(1576)
with a large width being around 800 MeV and assigned its number to
. We show that the isospin of this resonant structure should be
assigned to 1. This state might be a molecule state or a tetraquark state. We
study the consequences of a possible - molecular
interpretation. In this scenario, the broad width can easily be understood. By
using the data of , the branching
ratios and are further estimated in this molecular
state scenario. It is shown that the decay mode should have a
much larger branching ratio than the decay mode has. As a
consequence, this resonant structure should also be seen in the and processes, especially in
the former process. Carefully searching this resonant structure in the
and decays should
be important for understanding the structure of X(1567).Comment: 5 pages, ReVTeX4, 3 figures. Version accepted for publication as a
brief report in Phys. Rev.
Enhanced breaking of heavy quark spin symmetry
Heavy quark spin symmetry is useful to make predictions on ratios of decay or
production rates of systems involving heavy quarks. The breaking of spin
symmetry is generally of the order of , with
the scale of QCD and the heavy quark mass. In this
paper, we will show that a small - and -wave mixing in the wave function
of the heavy quarkonium could induce a large breaking in the ratios of partial
decay widths. As an example, we consider the decays of the
into the , which were recently measured by the
Belle Collaboration. These decays exhibit a huge breaking of the spin symmetry
relation were the a pure bottomonium state. We propose
that this could be a consequence of a mixing of the -wave and -wave
components in the . Prediction on the ratio
is presented assuming that the decay of the -wave component is dominated by
the coupled-channel effects.Comment: 13 pages, 5 figures. Discussion extended, version to appear in
Phys.Lett.
Automatic Objects Removal for Scene Completion
With the explosive growth of web-based cameras and mobile devices, billions
of photographs are uploaded to the internet. We can trivially collect a huge
number of photo streams for various goals, such as 3D scene reconstruction and
other big data applications. However, this is not an easy task due to the fact
the retrieved photos are neither aligned nor calibrated. Furthermore, with the
occlusion of unexpected foreground objects like people, vehicles, it is even
more challenging to find feature correspondences and reconstruct realistic
scenes. In this paper, we propose a structure based image completion algorithm
for object removal that produces visually plausible content with consistent
structure and scene texture. We use an edge matching technique to infer the
potential structure of the unknown region. Driven by the estimated structure,
texture synthesis is performed automatically along the estimated curves. We
evaluate the proposed method on different types of images: from highly
structured indoor environment to the natural scenes. Our experimental results
demonstrate satisfactory performance that can be potentially used for
subsequent big data processing: 3D scene reconstruction and location
recognition.Comment: 6 pages, IEEE International Conference on Computer Communications
(INFOCOM 14), Workshop on Security and Privacy in Big Data, Toronto, Canada,
201
A Global Context Mechanism for Sequence Labeling
Sequential labeling tasks necessitate the computation of sentence
representations for each word within a given sentence. With the advent of
advanced pretrained language models; one common approach involves incorporating
a BiLSTM layer to bolster the sequence structure information at the output
level. Nevertheless, it has been empirically demonstrated (P.-H. Li et al.,
2020) that the potential of BiLSTM for generating sentence representations for
sequence labeling tasks is constrained, primarily due to the amalgamation of
fragments form past and future sentence representations to form a complete
sentence representation. In this study, we discovered that strategically
integrating the whole sentence representation, which existing in the first cell
and last cell of BiLSTM, into sentence representation of ecah cell, could
markedly enhance the F1 score and accuracy. Using BERT embedded within BiLSTM
as illustration, we conducted exhaustive experiments on nine datasets for
sequence labeling tasks, encompassing named entity recognition (NER), part of
speech (POS) tagging and End-to-End Aspect-Based sentiment analysis (E2E-ABSA).
We noted significant improvements in F1 scores and accuracy across all examined
datasets
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