15,031 research outputs found
Y(4143) is probably a molecular partner of Y(3930)
After discussing the various possible interpretations of the Y(4143) signal
observed by the CDF collaboration in the mode, we tend to
conclude that Y(4143) is probably a molecular state
with or while Y(3930) is its
molecular partner as predicted in our previous work (arXiv:0808.0073). Both the
hidden-charm and open charm two-body decays occur through the rescattering of
the vector components within the molecular states while the three- and
four-body open charm decay modes are forbidden kinematically. Hence their
widths are narrow naturally. CDF, Babar and Belle collaborations may have
discovered heavy molecular states already. We urge experimentalists to measure
their quantum numbers and explore their radiative decay modes in the future.Comment: 6 pages, 1 table, 4 figure
Entropy exchange, coherent information and concurrence
For a simple model we derive analytic expressions of entropy exchange and
coherent information, from which relations between them and the concurrence are
drawn. We find that in the quantum evolution the entropy exchange exhibits
behavior \textsl{opposite} to that of the concurrence, whereas the coherent
information shows features very similar to those of the concurrence. The
meaning of this result for general systems is discussed.Comment: 4 pages, 8 figures v2: version accepted for publication in Phys. Rev.
Comment on ``Geometric phase of entangled spin pairs in a magnetic field''
The degree of entanglement between two spins may change due to interaction.
About this we find that a wrong result in a recent work by Ge and Wadati [Phys.
Rev. A {\bf72}, 052101(2005)] which breach the basic principle.Comment: 2 pages, comment on Phys. Rev. A {\bf72}, 052101(2005), and to appear
in Phys. Rev.
Detecting Oriented Text in Natural Images by Linking Segments
Most state-of-the-art text detection methods are specific to horizontal Latin
text and are not fast enough for real-time applications. We introduce Segment
Linking (SegLink), an oriented text detection method. The main idea is to
decompose text into two locally detectable elements, namely segments and links.
A segment is an oriented box covering a part of a word or text line; A link
connects two adjacent segments, indicating that they belong to the same word or
text line. Both elements are detected densely at multiple scales by an
end-to-end trained, fully-convolutional neural network. Final detections are
produced by combining segments connected by links. Compared with previous
methods, SegLink improves along the dimensions of accuracy, speed, and ease of
training. It achieves an f-measure of 75.0% on the standard ICDAR 2015
Incidental (Challenge 4) benchmark, outperforming the previous best by a large
margin. It runs at over 20 FPS on 512x512 images. Moreover, without
modification, SegLink is able to detect long lines of non-Latin text, such as
Chinese.Comment: To Appear in CVPR 201
Multiple Fermi pockets revealed by Shubnikov-de Haas oscillations in WTe2
We use magneto-transport measurements to investigate the electronic structure
of WTe2 single crystals. A non-saturating and parabolic magnetoresistance is
observed in the temperature range between 2.5 to 200 K and magnetic fields up
to 8 T. Shubnikov - de Haas oscillations with beating patterns are observed.
The fast Fourier transform of the SdH oscillations reveals three oscillation
frequencies, corresponding to three pairs of Fermi pockets with comparable
effective masses , m* ~ 0.31 me. By fitting the Hall resistivity, we infer the
presence of one pair of electron pockets and two pairs of hole pockets,
together with nearly perfect compensation of the electron-hole carrier
concentration. These magnetotransport measurements reveal the complex
electronic structure in WTe2, explaining the nonsaturating magnetoresistance.Comment: Submitted to journal on 1 April, 2015, 4 Figure
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