3,253 research outputs found
Possible assignments of the , and as axial-vector molecular states
In this article, we construct both the color singlet-singlet type and
octet-octet type currents to interpolate the , ,
, and calculate the vacuum condensates up to dimension-10 in the
operator product expansion. Then we study the axial-vector hidden charmed and
hidden bottom molecular states with the QCD sum rules, explore the energy scale
dependence of the QCD sum rules for the heavy molecular states in details, and
use the formula with the effective
masses to determine the energy scales. The numerical results
support assigning the , , as the color
singlet-singlet type molecular states with , , ,
respectively, more theoretical and experimental works are still needed to
distinguish the molecule and tetraquark assignments; while there are no
candidates for the color octet-octet type molecular states.Comment: 20 pages, 20 figures, add detailed discussions. arXiv admin note:
substantial text overlap with arXiv:1310.2422, arXiv:1312.2652,
arXiv:1312.1537, arXiv:1311.104
Analysis of the pentaquark states in the diquark model with QCD sum rules
In this article, we present the scalar-diquark-scalar-diquark-antiquark type
and scalar-diquark-axialvector-diquark-antiquark type pentaquark configurations
in the diquark model, and study the masses and pole residues of the
hidden-charmed pentaquark states in details with the
QCD sum rules by extending our previous work on the and
hidden-charmed pentaquark states. We calculate the
contributions of the vacuum condensates up to dimension-10 in the operator
product expansion by constructing both the
scalar-diquark-scalar-diquark-antiquark type and
scalar-diquark-axialvector-diquark-antiquark type interpolating currents. The
present predictions of the masses can be confronted to the LHCb experimental
data in the future.Comment: 20 pages, 17 figures. arXiv admin note: substantial text overlap with
arXiv:1508.0146
On the Harmonic approximation for large Josephson junction coupling charge qubits
We revisit the harmonic approximation (HA) for a large Josephson junction
interacting with some charge qubits through the variational approach for the
quantum dynamics of the junction-qubit coupling system. By making use of
numerical calculation and analytical treatment, the conditions under which HA
works well can be precisely presented to control the parameters implementing
the two-qubit quantum logical gate through the couplings to the large junction
with harmonic oscillator (HO) Hamiltonian.Comment: 7 pages, 3 figure
Convolutional Neural Networks over Tree Structures for Programming Language Processing
Programming language processing (similar to natural language processing) is a
hot research topic in the field of software engineering; it has also aroused
growing interest in the artificial intelligence community. However, different
from a natural language sentence, a program contains rich, explicit, and
complicated structural information. Hence, traditional NLP models may be
inappropriate for programs. In this paper, we propose a novel tree-based
convolutional neural network (TBCNN) for programming language processing, in
which a convolution kernel is designed over programs' abstract syntax trees to
capture structural information. TBCNN is a generic architecture for programming
language processing; our experiments show its effectiveness in two different
program analysis tasks: classifying programs according to functionality, and
detecting code snippets of certain patterns. TBCNN outperforms baseline
methods, including several neural models for NLP.Comment: Accepted at AAAI-1
Entanglement criterion via general symmetric informationally complete measurements
We study the quantum separability problem by using general symmetric
informationally complete measurements and present a separability criterion for
arbitrary dimensional bipartite systems. We show by detailed examples that our
criterion is more powerful than the existing ones in entanglement detection.Comment: 8 pages, 5 figure
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